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This commit is contained in:
RocketGod
2022-09-22 09:26:57 -07:00
parent fee0ab05fd
commit 957ea3d712
4511 changed files with 1943182 additions and 0 deletions
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544
Software/portapack-mayhem/firmware/baseband/CMakeLists.txt Normal file
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#
# Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
# Copyright (C) 2016 Furrtek
#
# This file is part of PortaPack.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
##############################################################################
# Build global options
# NOTE: Can be overridden externally.
#
enable_language(C CXX ASM)
project(baseband_shared)
# Compiler options here.
set(USE_OPT "-O3 -g -falign-functions=16 -fno-math-errno --specs=nano.specs")
# C specific options here (added to USE_OPT).
set(USE_COPT "-std=gnu99")
# C++ specific options here (added to USE_OPT).
set(USE_CPPOPT "-std=c++17 -fno-rtti -fno-exceptions -Weffc++ -Wuninitialized")
# Enable this if you want the linker to remove unused code and data
set(USE_LINK_GC yes)
# Linker extra options here.
set(USE_LDOPT)
# Enable this if you want link time optimizations (LTO)
set(USE_LTO no)
# If enabled, this option allows to compile the application in THUMB mode.
set(USE_THUMB yes)
# Enable this if you want to see the full log while compiling.
set(USE_VERBOSE_COMPILE no)
#
# Build global options
##############################################################################
##############################################################################
# Architecture or project specific options
#
# Enables the use of FPU on Cortex-M4 (no, softfp, hard).
set(USE_FPU hard)
#
# Architecture or project specific options
##############################################################################
##############################################################################
# Project, sources and paths
#
# Imported source files and paths
include(${CHIBIOS_PORTAPACK}/boards/PORTAPACK_BASEBAND/board.cmake)
include(${CHIBIOS_PORTAPACK}/os/hal/platforms/LPC43xx_M4/platform.cmake)
include(${CHIBIOS}/os/hal/hal.cmake)
include(${CHIBIOS_PORTAPACK}/os/ports/GCC/ARMCMx/LPC43xx_M4/port.cmake)
include(${CHIBIOS}/os/kernel/kernel.cmake)
include(${CHIBIOS}/test/test.cmake)
# Define linker script file here
set(LDSCRIPT ${PORTLD}/LPC43xx_M4.ld)
# C sources that can be compiled in ARM or THUMB mode depending on the global
# setting.
set(CSRC
${PORTSRC}
${KERNSRC}
${TESTSRC}
${HALSRC}
${PLATFORMSRC}
${BOARDSRC}
)
# C++ sources that can be compiled in ARM or THUMB mode depending on the global
# setting.
set(CPPSRC
baseband.cpp
${COMMON}/message_queue.cpp
${COMMON}/event.cpp
event_m4.cpp
${COMMON}/thread_wait.cpp
${COMMON}/gpdma.cpp
baseband_dma.cpp
${COMMON}/baseband_sgpio.cpp
${COMMON}/portapack_shared_memory.cpp
${COMMON}/buffer.cpp
baseband_thread.cpp
baseband_processor.cpp
baseband_stats_collector.cpp
dsp_decimate.cpp
dsp_demodulate.cpp
dsp_hilbert.cpp
dsp_modulate.cpp
dsp_goertzel.cpp
matched_filter.cpp
spectrum_collector.cpp
tv_collector.cpp
stream_input.cpp
stream_output.cpp
dsp_squelch.cpp
clock_recovery.cpp
packet_builder.cpp
${COMMON}/dsp_fft.cpp
${COMMON}/dsp_fir_taps.cpp
${COMMON}/dsp_iir.cpp
${COMMON}/dsp_sos.cpp
fxpt_atan2.cpp
rssi.cpp
rssi_dma.cpp
rssi_thread.cpp
audio_compressor.cpp
audio_output.cpp
audio_input.cpp
audio_dma.cpp
audio_stats_collector.cpp
${COMMON}/utility.cpp
${COMMON}/chibios_cpp.cpp
${COMMON}/debug.cpp
${COMMON}/gcc.cpp
tone_gen.cpp
)
# C sources to be compiled in ARM mode regardless of the global setting.
# NOTE: Mixing ARM and THUMB mode enables the -mthumb-interwork compiler
# option that results in lower performance and larger code size.
set(ACSRC)
# C++ sources to be compiled in ARM mode regardless of the global setting.
# NOTE: Mixing ARM and THUMB mode enables the -mthumb-interwork compiler
# option that results in lower performance and larger code size.
set(ACPPSRC)
# C sources to be compiled in THUMB mode regardless of the global setting.
# NOTE: Mixing ARM and THUMB mode enables the -mthumb-interwork compiler
# option that results in lower performance and larger code size.
set(TCSRC)
# C sources to be compiled in THUMB mode regardless of the global setting.
# NOTE: Mixing ARM and THUMB mode enables the -mthumb-interwork compiler
# option that results in lower performance and larger code size.
set(TCPPSRC)
# List ASM source files here
set(ASMSRC ${PORTASM})
set(INCDIR ${COMMON} ${PORTINC} ${KERNINC} ${TESTINC}
${HALINC} ${PLATFORMINC} ${BOARDINC}
${CHIBIOS}/os/various
)
#
# Project, sources and paths
##############################################################################
##############################################################################
# Compiler settings
#
set(MCU cortex-m4)
# ARM-specific options here
set(AOPT)
# THUMB-specific options here
set(TOPT "-mthumb -DTHUMB")
# Define C warning options here
set(CWARN "-Wall -Wextra -Wstrict-prototypes")
# Define C++ warning options here
set(CPPWARN "-Wall -Wextra")
#
# Compiler settings
##############################################################################
##############################################################################
# Start of default section
#
# List all default C defines here, like -D_DEBUG=1
# TODO: Switch -DCRT0_INIT_DATA depending on load from RAM or SPIFI?
# NOTE: _RANDOM_TCC to kill a GCC 4.9.3 error with std::max argument types
set(DDEFS "-DLPC43XX -DLPC43XX_M4 -D__NEWLIB__ -DHACKRF_ONE -DTOOLCHAIN_GCC -DTOOLCHAIN_GCC_ARM -D_RANDOM_TCC=0 -D'VERSION_STRING=\"${VERSION}\"'")
# List all default ASM defines here, like -D_DEBUG=1
set(DADEFS)
# List all default directories to look for include files here
set(DINCDIR)
# List the default directory to look for the libraries here
set(DLIBDIR)
# List all default libraries here
set(DLIBS)
#
# End of default section
##############################################################################
##############################################################################
# Start of user section
#
# List all user C define here, like -D_DEBUG=1
set(UDEFS)
# Define ASM defines here
set(UADEFS)
# List all user directories here
set(UINCDIR)
# List the user directory to look for the libraries here
set(ULIBDIR)
# List all user libraries here
set(ULIBS)
#
# End of user defines
##############################################################################
set(RULESPATH ${CHIBIOS}/os/ports/GCC/ARMCMx)
include(${RULESPATH}/rules.cmake)
#######################################################################
add_library(${PROJECT_NAME} OBJECT ${CSRC} ${CPPSRC} ${ASMSRC})
include_directories(. ${INCDIR})
#######################################################################
set(BASEBAND_IMAGES)
macro(DeclareTargets chunk_tag name)
project("baseband_${name}")
include(${RULESPATH}/rules.cmake)
add_executable(${PROJECT_NAME}.elf $<TARGET_OBJECTS:baseband_shared> ${MODE_CPPSRC})
set_target_properties(${PROJECT_NAME}.elf PROPERTIES LINK_DEPENDS ${LDSCRIPT})
add_definitions(${DEFS})
include_directories(. ${INCDIR})
link_directories(${LLIBDIR})
target_link_libraries(${PROJECT_NAME}.elf ${LIBS})
target_link_libraries(${PROJECT_NAME}.elf -Wl,-Map=${PROJECT_NAME}.map)
add_custom_command(
OUTPUT ${PROJECT_NAME}.bin ${PROJECT_NAME}.img
COMMAND ${CMAKE_OBJCOPY} -O binary ${PROJECT_NAME}.elf ${PROJECT_NAME}.bin
COMMAND ${MAKE_IMAGE_CHUNK} ${PROJECT_NAME}.bin ${chunk_tag} ${PROJECT_NAME}.img
DEPENDS ${PROJECT_NAME}.elf ${MAKE_IMAGE_CHUNK}
VERBATIM
)
set(BASEBAND_IMAGES ${BASEBAND_IMAGES} ${PROJECT_NAME}.img)
endmacro()
### ACARS RX
set(MODE_CPPSRC
proc_acars.cpp
)
DeclareTargets(PACA acars)
### ADS-B RX
set(MODE_CPPSRC
proc_adsbrx.cpp
)
DeclareTargets(PADR adsbrx)
### ADS-B TX
set(MODE_CPPSRC
proc_adsbtx.cpp
)
DeclareTargets(PADT adsbtx)
### AFSK
set(MODE_CPPSRC
proc_afsk.cpp
)
DeclareTargets(PAFT afsktx)
### AFSK RX
set(MODE_CPPSRC
proc_afskrx.cpp
)
DeclareTargets(PAFR afskrx)
### APRS RX
set(MODE_CPPSRC
proc_aprsrx.cpp
)
DeclareTargets(PAPR aprsrx)
### NRF RX
set(MODE_CPPSRC
proc_nrfrx.cpp
)
DeclareTargets(PNRR nrfrx)
### BTLE RX
set(MODE_CPPSRC
proc_btlerx.cpp
)
DeclareTargets(PBTR btlerx)
### AIS
set(MODE_CPPSRC
proc_ais.cpp
)
DeclareTargets(PAIS ais)
### AM Audio
set(MODE_CPPSRC
proc_am_audio.cpp
)
DeclareTargets(PAMA am_audio)
### AM TV
set(MODE_CPPSRC
proc_am_tv.cpp
)
DeclareTargets(PAMT am_tv)
### Audio transmit
set(MODE_CPPSRC
proc_audiotx.cpp
)
DeclareTargets(PATX audio_tx)
### Capture
set(MODE_CPPSRC
proc_capture.cpp
)
DeclareTargets(PCAP capture)
### ERT
set(MODE_CPPSRC
proc_ert.cpp
)
DeclareTargets(PERT ert)
### Radiosonde
set(MODE_CPPSRC
proc_sonde.cpp
)
DeclareTargets(PSON sonde)
### FSK TX
set(MODE_CPPSRC
proc_fsk.cpp
)
DeclareTargets(PFSK fsktx)
### Jammer
set(MODE_CPPSRC
proc_jammer.cpp
)
DeclareTargets(PJAM jammer)
### Microphone transmit
set(MODE_CPPSRC
proc_mictx.cpp
)
DeclareTargets(PMTX mic_tx)
### NFM Audio
set(MODE_CPPSRC
proc_nfm_audio.cpp
)
DeclareTargets(PNFM nfm_audio)
### No op
set(MODE_CPPSRC
proc_noop.cpp
)
DeclareTargets(PNOP no_operation)
### OOK
set(MODE_CPPSRC
proc_ook.cpp
)
DeclareTargets(POOK ook)
### POCSAG RX
set(MODE_CPPSRC
proc_pocsag.cpp
)
DeclareTargets(PPOC pocsag)
### RDS
set(MODE_CPPSRC
proc_rds.cpp
)
DeclareTargets(PRDS rds)
### Replay
set(MODE_CPPSRC
proc_replay.cpp
)
DeclareTargets(PREP replay)
### GPS Simulator
set(MODE_CPPSRC
proc_gps_sim.cpp
)
DeclareTargets(PGPS gps_sim)
### Signal generator
set(MODE_CPPSRC
proc_siggen.cpp
)
DeclareTargets(PSIG siggen)
### SSTV TX
set(MODE_CPPSRC
proc_sstvtx.cpp
)
DeclareTargets(PSTX sstvtx)
### Test
set(MODE_CPPSRC
proc_test.cpp
)
DeclareTargets(PTST test)
### Tones
set(MODE_CPPSRC
proc_tones.cpp
)
DeclareTargets(PTON tones)
### TPMS
set(MODE_CPPSRC
proc_tpms.cpp
)
DeclareTargets(PTPM tpms)
### Wideband Spectrum
set(MODE_CPPSRC
proc_wideband_spectrum.cpp
)
DeclareTargets(PSPE wideband_spectrum)
### WFM Audio
set(MODE_CPPSRC
proc_wfm_audio.cpp
)
DeclareTargets(PWFM wfm_audio)
### HackRF "factory" firmware
add_custom_command(
OUTPUT hackrf.img
COMMAND ${MAKE_IMAGE_CHUNK} ${HACKRF_FIRMWARE_BIN_IMAGE} HRF1 hackrf.img 98304
DEPENDS ${HACKRF_FIRMWARE_BIN_FILENAME} ${MAKE_IMAGE_CHUNK}
VERBATIM
)
set(BASEBAND_IMAGES ${BASEBAND_IMAGES} hackrf.img)
### Terminator image
add_custom_command(
OUTPUT terminator.img
COMMAND ${MAKE_IMAGE_CHUNK} terminator.img
DEPENDS ${MAKE_IMAGE_CHUNK}
VERBATIM
)
set(BASEBAND_IMAGES ${BASEBAND_IMAGES} terminator.img)
#######################################################################
project(baseband)
add_custom_command(
OUTPUT ${PROJECT_NAME}.img
COMMAND cat ${BASEBAND_IMAGES} > ${PROJECT_NAME}.img
DEPENDS ${BASEBAND_IMAGES}
DEPENDS hackrf.img terminator.img
VERBATIM
)
add_custom_target(
${PROJECT_NAME}
DEPENDS ${PROJECT_NAME}.img
)

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Software/portapack-mayhem/firmware/baseband/audio_compressor.cpp Normal file
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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "audio_compressor.hpp"
float GainComputer::operator()(const float x) const {
const auto abs_x = std::abs(x);
const auto db = (abs_x < lin_floor) ? db_floor : log2_db_k * fast_log2(abs_x);
const auto overshoot_db = db - threshold_db;
if( knee_width_db > 0.0f ) {
const auto w2 = knee_width_db / 2.0f;
const auto a = w2 / (knee_width_db * knee_width_db);
const auto in_transition = (overshoot_db > -w2) && (overshoot_db < w2);
const auto rectified_overshoot = in_transition ? (a * std::pow(overshoot_db + w2, 2.0f)) : std::max(overshoot_db, 0.0f);
return rectified_overshoot * slope;
} else {
const auto rectified_overshoot = std::max(overshoot_db, 0.0f);
return rectified_overshoot * slope;
}
}
void FeedForwardCompressor::execute_in_place(const buffer_f32_t& buffer) {
constexpr float makeup_gain = std::pow(10.0f, (threshold - (threshold / ratio)) / -20.0f);
for(size_t i=0; i<buffer.count; i++) {
buffer.p[i] = execute_once(buffer.p[i]) * makeup_gain;
}
}
float FeedForwardCompressor::execute_once(const float x) {
const auto gain_db = gain_computer(x);
const auto peak_db = -peak_detector(-gain_db);
const auto gain = fast_pow2(peak_db * (3.321928094887362f / 20.0f));
return x * gain;
}

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Software/portapack-mayhem/firmware/baseband/audio_compressor.hpp Normal file
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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __AUDIO_COMPRESSOR_H__
#define __AUDIO_COMPRESSOR_H__
#include "dsp_types.hpp"
#include "utility.hpp"
#include <cmath>
/* Code based on article in Journal of the Audio Engineering Society
* Vol. 60, No. 6, 2012 June, by Dimitrios Giannoulis, Michael Massberg,
* Joshua D. Reiss "Digital Dynamic Range Compressor Design – A Tutorial
* and Analysis"
*/
class GainComputer {
public:
constexpr GainComputer(
float ratio,
float threshold
) : ratio { ratio },
slope { 1.0f / ratio - 1.0f },
threshold_db { threshold }
{
}
float operator()(const float x) const;
private:
const float ratio;
const float slope;
const float threshold_db;
static constexpr float knee_width_db = 0.0f;
static constexpr float db_floor = -120.0f;
static constexpr float lin_floor = std::pow(10.0f, db_floor / 20.0f);
static constexpr float log2_db_k = 20.0f * std::log10(2.0f);
};
class PeakDetectorBranchingSmooth {
public:
constexpr PeakDetectorBranchingSmooth(
float att_a,
float rel_a
) : att_a { att_a },
rel_a { rel_a }
{
}
float operator()(const float db) {
const auto a = (db > state) ? att_a : rel_a;
state = db + a * (state - db);
return state;
}
private:
float state { 0.0f };
const float att_a;
const float rel_a;
};
class FeedForwardCompressor {
public:
void execute_in_place(const buffer_f32_t& buffer);
private:
static constexpr float fs = 12000.0f;
static constexpr float ratio = 10.0f;
static constexpr float threshold = -30.0f;
GainComputer gain_computer { ratio, threshold };
PeakDetectorBranchingSmooth peak_detector { tau_alpha(0.010f, fs), tau_alpha(0.300f, fs) };
float execute_once(const float x);
static constexpr float tau_alpha(const float tau, const float fs) {
return std::exp(-1.0f / (tau * fs));
}
};
#endif/*__AUDIO_COMPRESSOR_H__*/

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Software/portapack-mayhem/firmware/baseband/audio_dma.cpp Normal file
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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "audio_dma.hpp"
#include <cstdint>
#include <cstddef>
#include <array>
#include "hal.h"
#include "gpdma.hpp"
using namespace lpc43xx;
#include "portapack_dma.hpp"
namespace audio {
namespace dma {
constexpr uint32_t gpdma_ahb_master_peripheral = 1;
constexpr uint32_t gpdma_ahb_master_memory = 0;
constexpr uint32_t gpdma_ahb_master_lli_fetch = 0;
constexpr uint32_t gpdma_rx_peripheral = 0x9; /* I2S0 DMA request 1 */
constexpr uint32_t gpdma_rx_src_peripheral = gpdma_rx_peripheral;
constexpr uint32_t gpdma_rx_dest_peripheral = gpdma_rx_peripheral;
constexpr uint32_t gpdma_tx_peripheral = 0xa; /* I2S0 DMA request 2 */
constexpr uint32_t gpdma_tx_src_peripheral = gpdma_tx_peripheral;
constexpr uint32_t gpdma_tx_dest_peripheral = gpdma_tx_peripheral;
constexpr gpdma::channel::LLIPointer lli_pointer(const void* lli) {
return {
.lm = gpdma_ahb_master_lli_fetch,
.r = 0,
.lli = reinterpret_cast<uint32_t>(lli),
};
}
constexpr gpdma::channel::Control control_tx(const size_t transfer_bytes) {
return {
.transfersize = gpdma::buffer_words(transfer_bytes, 4),
.sbsize = 4, /* Burst size: 32 */
.dbsize = 4, /* Burst size: 32 */
.swidth = 2, /* Source transfer width: word (32 bits) */
.dwidth = 2, /* Destination transfer width: word (32 bits) */
.s = gpdma_ahb_master_memory,
.d = gpdma_ahb_master_peripheral,
.si = 1,
.di = 0,
.prot1 = 0,
.prot2 = 0,
.prot3 = 0,
.i = 1,
};
}
constexpr gpdma::channel::Config config_tx() {
return {
.e = 0,
.srcperipheral = gpdma_tx_src_peripheral,
.destperipheral = gpdma_tx_dest_peripheral,
.flowcntrl = gpdma::FlowControl::MemoryToPeripheral_DMAControl,
.ie = 1,
.itc = 1,
.l = 0,
.a = 0,
.h = 0,
};
}
constexpr gpdma::channel::Control control_rx(const size_t transfer_bytes) {
return {
.transfersize = gpdma::buffer_words(transfer_bytes, 4),
.sbsize = 4, /* Burst size: 32 */
.dbsize = 4, /* Burst size: 32 */
.swidth = 2, /* Source transfer width: word (32 bits) */
.dwidth = 2, /* Destination transfer width: word (32 bits) */
.s = gpdma_ahb_master_peripheral,
.d = gpdma_ahb_master_memory,
.si = 0,
.di = 1,
.prot1 = 0,
.prot2 = 0,
.prot3 = 0,
.i = 1,
};
}
constexpr gpdma::channel::Config config_rx() {
return {
.e = 0,
.srcperipheral = gpdma_rx_src_peripheral,
.destperipheral = gpdma_rx_dest_peripheral,
.flowcntrl = gpdma::FlowControl::PeripheralToMemory_DMAControl,
.ie = 1,
.itc = 1,
.l = 0,
.a = 0,
.h = 0,
};
}
/* TODO: Clean up terminology around "buffer", "transfer", "samples" */
constexpr size_t buffer_samples_log2n = 7;
constexpr size_t buffer_samples = (1 << buffer_samples_log2n);
constexpr size_t transfers_per_buffer_log2n = 2;
constexpr size_t transfers_per_buffer = (1 << transfers_per_buffer_log2n);
constexpr size_t transfer_samples = buffer_samples / transfers_per_buffer;
constexpr size_t transfers_mask = transfers_per_buffer - 1;
constexpr size_t buffer_bytes = buffer_samples * sizeof(sample_t);
constexpr size_t transfer_bytes = transfer_samples * sizeof(sample_t);
static std::array<sample_t, buffer_samples> buffer_tx;
static std::array<sample_t, buffer_samples> buffer_rx;
static std::array<gpdma::channel::LLI, transfers_per_buffer> lli_tx_loop;
static std::array<gpdma::channel::LLI, transfers_per_buffer> lli_rx_loop;
static constexpr auto& gpdma_channel_i2s0_tx = gpdma::channels[portapack::i2s0_tx_gpdma_channel_number];
static constexpr auto& gpdma_channel_i2s0_rx = gpdma::channels[portapack::i2s0_rx_gpdma_channel_number];
static volatile const gpdma::channel::LLI* tx_next_lli = nullptr;
static volatile const gpdma::channel::LLI* rx_next_lli = nullptr;
static void tx_transfer_complete() {
tx_next_lli = gpdma_channel_i2s0_tx.next_lli();
}
static void tx_error() {
disable();
}
static void rx_transfer_complete() {
rx_next_lli = gpdma_channel_i2s0_rx.next_lli();
}
static void rx_error() {
disable();
}
void init() {
gpdma_channel_i2s0_tx.set_handlers(tx_transfer_complete, tx_error);
gpdma_channel_i2s0_rx.set_handlers(rx_transfer_complete, rx_error);
// LPC_GPDMA->SYNC |= (1 << gpdma_rx_peripheral);
// LPC_GPDMA->SYNC |= (1 << gpdma_tx_peripheral);
}
static void configure_tx() {
const auto peripheral = reinterpret_cast<uint32_t>(&LPC_I2S0->TXFIFO);
const auto control_value = control_tx(transfer_bytes);
for(size_t i=0; i<lli_tx_loop.size(); i++) {
const auto memory = reinterpret_cast<uint32_t>(&buffer_tx[i * transfer_samples]);
lli_tx_loop[i].srcaddr = memory;
lli_tx_loop[i].destaddr = peripheral;
lli_tx_loop[i].lli = lli_pointer(&lli_tx_loop[(i + 1) % lli_tx_loop.size()]);
lli_tx_loop[i].control = control_value;
}
}
static void configure_rx() {
const auto peripheral = reinterpret_cast<uint32_t>(&LPC_I2S0->RXFIFO);
const auto control_value = control_rx(transfer_bytes);
for(size_t i=0; i<lli_rx_loop.size(); i++) {
const auto memory = reinterpret_cast<uint32_t>(&buffer_rx[i * transfer_samples]);
lli_rx_loop[i].srcaddr = peripheral;
lli_rx_loop[i].destaddr = memory;
lli_rx_loop[i].lli = lli_pointer(&lli_rx_loop[(i + 1) % lli_rx_loop.size()]);
lli_rx_loop[i].control = control_value;
}
}
void configure() {
configure_tx();
configure_rx();
}
void enable() {
const auto gpdma_config_tx = config_tx();
const auto gpdma_config_rx = config_rx();
gpdma_channel_i2s0_tx.configure(lli_tx_loop[0], gpdma_config_tx);
gpdma_channel_i2s0_rx.configure(lli_rx_loop[0], gpdma_config_rx);
gpdma_channel_i2s0_tx.enable();
gpdma_channel_i2s0_rx.enable();
}
void disable() {
gpdma_channel_i2s0_tx.disable();
gpdma_channel_i2s0_rx.disable();
}
buffer_t tx_empty_buffer() {
const auto next_lli = tx_next_lli;
if( next_lli ) {
const size_t next_index = next_lli - &lli_tx_loop[0];
const size_t free_index = (next_index + transfers_per_buffer - 2) & transfers_mask;
return { reinterpret_cast<sample_t*>(lli_tx_loop[free_index].srcaddr), transfer_samples };
} else {
return { nullptr, 0 };
}
}
buffer_t rx_empty_buffer() {
const auto next_lli = rx_next_lli;
if( next_lli ) {
const size_t next_index = next_lli - &lli_rx_loop[0];
const size_t free_index = (next_index + transfers_per_buffer - 2) & transfers_mask;
return { reinterpret_cast<sample_t*>(lli_rx_loop[free_index].destaddr), transfer_samples };
} else {
return { nullptr, 0 };
}
}
} /* namespace dma */
} /* namespace audio */

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __AUDIO_DMA_H__
#define __AUDIO_DMA_H__
#include <cstdint>
#include "buffer.hpp"
namespace audio {
struct sample_t {
union {
struct {
int16_t left;
int16_t right;
};
uint32_t raw;
};
};
using buffer_t = buffer_t<sample_t>;
namespace dma {
void init();
void configure();
void enable();
void disable();
audio::buffer_t tx_empty_buffer();
audio::buffer_t rx_empty_buffer();
} /* namespace dma */
} /* namespace audio */
#endif/*__AUDIO_DMA_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "audio_input.hpp"
#include "portapack_shared_memory.hpp"
#include "audio_dma.hpp"
#include "message.hpp"
#include <cstdint>
#include <cstddef>
#include <array>
void AudioInput::read_audio_buffer(buffer_s16_t& audio) {
auto audio_buffer = audio::dma::rx_empty_buffer();
for (size_t i=0; i<audio_buffer.count; i++)
audio.p[i] = audio_buffer.p[i].right;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __AUDIO_INPUT_H__
#define __AUDIO_INPUT_H__
#include "dsp_types.hpp"
#include "dsp_iir.hpp"
#include "dsp_squelch.hpp"
#include "stream_input.hpp"
#include <cstdint>
#include <memory>
class AudioInput {
public:
void read_audio_buffer(buffer_s16_t& audio);
private:
/*static constexpr float k = 32768.0f;
static constexpr float ki = 1.0f / k;
IIRBiquadFilter hpf { };*/
};
#endif/*__AUDIO_INPUT_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "audio_output.hpp"
#include "portapack_shared_memory.hpp"
#include "audio_dma.hpp"
#include "message.hpp"
#include <cstdint>
#include <cstddef>
#include <array>
void AudioOutput::configure(
const bool do_proc
) {
do_processing = do_proc;
}
void AudioOutput::configure(
const iir_biquad_config_t& hpf_config,
const iir_biquad_config_t& deemph_config,
const float squelch_threshold
) {
hpf.configure(hpf_config);
deemph.configure(deemph_config);
squelch.set_threshold(squelch_threshold);
}
void AudioOutput::write(
const buffer_s16_t& audio
) {
std::array<float, 32> audio_f;
for(size_t i=0; i<audio.count; i++) {
audio_f[i] = audio.p[i] * ki;
}
write(buffer_f32_t {
audio_f.data(),
audio.count,
audio.sampling_rate
});
}
void AudioOutput::write(
const buffer_f32_t& audio
) {
block_buffer.feed(
audio,
[this](const buffer_f32_t& buffer) {
this->on_block(buffer);
}
);
}
void AudioOutput::on_block(
const buffer_f32_t& audio
) {
if (do_processing) {
const auto audio_present_now = squelch.execute(audio);
hpf.execute_in_place(audio);
deemph.execute_in_place(audio);
audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
audio_present = (audio_present_history != 0);
if( !audio_present ) {
for(size_t i=0; i<audio.count; i++) {
audio.p[i] = 0;
}
}
} else
audio_present = true;
fill_audio_buffer(audio, audio_present);
}
bool AudioOutput::is_squelched() {
return !audio_present;
}
void AudioOutput::fill_audio_buffer(const buffer_f32_t& audio, const bool send_to_fifo) {
std::array<int16_t, 32> audio_int;
auto audio_buffer = audio::dma::tx_empty_buffer();
for(size_t i=0; i<audio_buffer.count; i++) {
const int32_t sample_int = audio.p[i] * k;
const int32_t sample_saturated = __SSAT(sample_int, 16);
audio_buffer.p[i].left = audio_buffer.p[i].right = sample_saturated;
audio_int[i] = sample_saturated;
}
if( stream && send_to_fifo ) {
stream->write(audio_int.data(), audio_buffer.count * sizeof(audio_int[0]));
}
feed_audio_stats(audio);
}
void AudioOutput::feed_audio_stats(const buffer_f32_t& audio) {
audio_stats.feed(
audio,
[](const AudioStatistics& statistics) {
const AudioStatisticsMessage audio_stats_message { statistics };
shared_memory.application_queue.push(audio_stats_message);
}
);
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __AUDIO_OUTPUT_H__
#define __AUDIO_OUTPUT_H__
#include "dsp_types.hpp"
#include "dsp_iir.hpp"
#include "dsp_squelch.hpp"
#include "stream_input.hpp"
#include "block_decimator.hpp"
#include "audio_stats_collector.hpp"
#include <cstdint>
#include <memory>
class AudioOutput {
public:
void configure(const bool do_proc);
void configure(
const iir_biquad_config_t& hpf_config,
const iir_biquad_config_t& deemph_config = iir_config_passthrough,
const float squelch_threshold = 0.0f
);
void write(const buffer_s16_t& audio);
void write(const buffer_f32_t& audio);
void set_stream(std::unique_ptr<StreamInput> new_stream) {
stream = std::move(new_stream);
}
bool is_squelched();
private:
static constexpr float k = 32768.0f;
static constexpr float ki = 1.0f / k;
BlockDecimator<float, 32> block_buffer { 1 };
IIRBiquadFilter hpf { };
IIRBiquadFilter deemph { };
FMSquelch squelch { };
std::unique_ptr<StreamInput> stream { };
AudioStatsCollector audio_stats { };
uint64_t audio_present_history = 0;
bool audio_present = false;
bool do_processing = true;
void on_block(const buffer_f32_t& audio);
void fill_audio_buffer(const buffer_f32_t& audio, const bool send_to_fifo);
void feed_audio_stats(const buffer_f32_t& audio);
};
#endif/*__AUDIO_OUTPUT_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "audio_stats_collector.hpp"
#include "utility.hpp"
void AudioStatsCollector::consume_audio_buffer(const buffer_f32_t& src) {
auto src_p = src.p;
const auto src_end = &src.p[src.count];
while(src_p < src_end) {
const auto sample = *(src_p++);
const auto sample_squared = sample * sample;
squared_sum += sample_squared;
if( sample_squared > max_squared ) {
max_squared = sample_squared;
}
}
}
bool AudioStatsCollector::update_stats(const size_t sample_count, const size_t sampling_rate) {
count += sample_count;
const size_t samples_per_update = sampling_rate * update_interval;
if( count >= samples_per_update ) {
statistics.rms_db = mag2_to_dbv_norm(squared_sum / count);
statistics.max_db = mag2_to_dbv_norm(max_squared);
statistics.count = count;
squared_sum = 0;
max_squared = 0;
count = 0;
return true;
} else {
return false;
}
}
bool AudioStatsCollector::feed(const buffer_f32_t& src) {
consume_audio_buffer(src);
return update_stats(src.count, src.sampling_rate);
}
bool AudioStatsCollector::mute(const size_t sample_count, const size_t sampling_rate) {
return update_stats(sample_count, sampling_rate);
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __AUDIO_STATS_COLLECTOR_H__
#define __AUDIO_STATS_COLLECTOR_H__
#include "dsp_types.hpp"
#include "message.hpp"
#include <cstdint>
#include <cstddef>
class AudioStatsCollector {
public:
template<typename Callback>
void feed(const buffer_f32_t& src, Callback callback) {
if( feed(src) ) {
callback(statistics);
}
}
template<typename Callback>
void mute(const size_t sample_count, const size_t sampling_rate, Callback callback) {
if( mute(sample_count, sampling_rate) ) {
callback(statistics);
}
}
private:
static constexpr float update_interval { 0.1f };
float squared_sum { 0 };
float max_squared { 0 };
size_t count { 0 };
AudioStatistics statistics { };
void consume_audio_buffer(const buffer_f32_t& src);
bool update_stats(const size_t sample_count, const size_t sampling_rate);
bool feed(const buffer_f32_t& src);
bool mute(const size_t sample_count, const size_t sampling_rate);
};
#endif/*__AUDIO_STATS_COLLECTOR_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "ch.h"
#include "lpc43xx_cpp.hpp"
#include "portapack_shared_memory.hpp"
#include "portapack_dma.hpp"
#include "gpdma.hpp"
#include "audio_dma.hpp"
static void init() {
audio::dma::init();
audio::dma::configure();
audio::dma::enable();
nvicEnableVector(DMA_IRQn, CORTEX_PRIORITY_MASK(LPC_DMA_IRQ_PRIORITY));
}
static void halt() {
port_disable();
while(true) {
port_wait_for_interrupt();
}
}
extern "C" {
void __late_init(void) {
/*
* System initializations.
* - HAL initialization, this also initializes the configured device drivers
* and performs the board-specific initializations.
* - Kernel initialization, the main() function becomes a thread and the
* RTOS is active.
*/
halInit();
/* After this call, scheduler, systick, heap, etc. are available. */
/* By doing chSysInit() here, it runs before C++ constructors, which may
* require the heap.
*/
chSysInit();
/* Baseband initialization */
init();
}
void _default_exit(void) {
// TODO: Is this complete?
nvicDisableVector(DMA_IRQn);
chSysDisable();
systick_stop();
ShutdownMessage shutdown_message;
shared_memory.application_queue.push(shutdown_message);
shared_memory.baseband_message = nullptr;
halt();
}
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "baseband_dma.hpp"
#include <cstdint>
#include <cstddef>
#include <array>
#include "hal.h"
#include "gpdma.hpp"
using namespace lpc43xx;
#include "portapack_dma.hpp"
#include "thread_wait.hpp"
namespace baseband {
namespace dma {
constexpr uint32_t gpdma_ahb_master_sgpio = 0;
constexpr uint32_t gpdma_ahb_master_memory = 1;
constexpr uint32_t gpdma_ahb_master_lli_fetch = 0;
constexpr uint32_t gpdma_src_peripheral = 0x0;
constexpr uint32_t gpdma_dest_peripheral = 0x0;
constexpr gpdma::channel::LLIPointer lli_pointer(const void* lli) {
return {
.lm = gpdma_ahb_master_lli_fetch,
.r = 0,
.lli = reinterpret_cast<uint32_t>(lli),
};
}
constexpr gpdma::channel::Control control(const baseband::Direction direction, const size_t buffer_words) {
return {
.transfersize = buffer_words,
.sbsize = 0, /* Burst size: 1 */
.dbsize = 0, /* Burst size: 1 */
.swidth = 2, /* Source transfer width: word (32 bits) */
.dwidth = 2, /* Destination transfer width: word (32 bits) */
.s = (direction == baseband::Direction::Transmit) ? gpdma_ahb_master_memory : gpdma_ahb_master_sgpio,
.d = (direction == baseband::Direction::Transmit) ? gpdma_ahb_master_sgpio : gpdma_ahb_master_memory,
.si = (direction == baseband::Direction::Transmit) ? 1U : 0U,
.di = (direction == baseband::Direction::Transmit) ? 0U : 1U,
.prot1 = 0,
.prot2 = 0,
.prot3 = 0,
.i = 1,
};
}
constexpr gpdma::channel::Config config(const baseband::Direction direction) {
return {
.e = 0,
.srcperipheral = gpdma_src_peripheral,
.destperipheral = gpdma_dest_peripheral,
.flowcntrl = (direction == baseband::Direction::Transmit)
? gpdma::FlowControl::MemoryToPeripheral_DMAControl
: gpdma::FlowControl::PeripheralToMemory_DMAControl,
.ie = 1,
.itc = 1,
.l = 0,
.a = 0,
.h = 0,
};
}
constexpr size_t buffer_samples_log2n = 13;
constexpr size_t buffer_samples = (1 << buffer_samples_log2n);
constexpr size_t transfers_per_buffer_log2n = 2;
constexpr size_t transfers_per_buffer = (1 << transfers_per_buffer_log2n);
constexpr size_t transfer_samples = buffer_samples / transfers_per_buffer;
constexpr size_t transfers_mask = transfers_per_buffer - 1;
constexpr size_t buffer_bytes = buffer_samples * sizeof(baseband::sample_t);
constexpr size_t transfer_bytes = transfer_samples * sizeof(baseband::sample_t);
constexpr size_t msg_count = transfers_per_buffer - 1;
static std::array<gpdma::channel::LLI, transfers_per_buffer> lli_loop;
static constexpr auto& gpdma_channel_sgpio = gpdma::channels[portapack::sgpio_gpdma_channel_number];
static ThreadWait thread_wait;
static void transfer_complete() {
const auto next_lli_index = gpdma_channel_sgpio.next_lli() - &lli_loop[0];
thread_wait.wake_from_interrupt(next_lli_index);
}
static void dma_error() {
thread_wait.wake_from_interrupt(-1);
disable();
}
void init() {
gpdma_channel_sgpio.set_handlers(transfer_complete, dma_error);
#if defined(PORTAPACK_BASEBAND_DMA_NO_SYNC)
/* Disable synchronization logic to improve(?) DMA response time.
* SGPIO (peripheral) must be on same clock as GPDMA peripheral.
* SGPIO runs from BASE_PERIPH_CLK, which is set to PLL1 in normal
* operation, same as the M4 and M0 cores. Memory, of course, is
* running from the same clock as the cores.
*/
LPC_GPDMA->SYNC |= (1 << gpdma_src_peripheral);
LPC_GPDMA->SYNC |= (1 << gpdma_dest_peripheral);
#endif
}
void configure(
baseband::sample_t* const buffer_base,
const baseband::Direction direction
) {
const auto peripheral = reinterpret_cast<uint32_t>(&LPC_SGPIO->REG_SS[0]);
const auto control_value = control(direction, gpdma::buffer_words(transfer_bytes, 4));
for(size_t i=0; i<lli_loop.size(); i++) {
const auto memory = reinterpret_cast<uint32_t>(&buffer_base[i * transfer_samples]);
lli_loop[i].srcaddr = (direction == Direction::Transmit) ? memory : peripheral;
lli_loop[i].destaddr = (direction == Direction::Transmit) ? peripheral : memory;
lli_loop[i].lli = lli_pointer(&lli_loop[(i + 1) % lli_loop.size()]);
lli_loop[i].control = control_value;
}
}
void enable(const baseband::Direction direction) {
const auto gpdma_config = config(direction);
gpdma_channel_sgpio.configure(lli_loop[0], gpdma_config);
gpdma_channel_sgpio.enable();
}
bool is_enabled() {
return gpdma_channel_sgpio.is_enabled();
}
void disable() {
gpdma_channel_sgpio.disable();
}
baseband::buffer_t wait_for_buffer() {
const auto next_index = thread_wait.sleep();
if( next_index >= 0 ) {
const size_t free_index = (next_index + transfers_per_buffer - 2) & transfers_mask;
const auto src = lli_loop[free_index].srcaddr;
const auto dst = lli_loop[free_index].destaddr;
const auto p = (src == reinterpret_cast<uint32_t>(&LPC_SGPIO->REG_SS[0])) ? dst : src;
return { reinterpret_cast<sample_t*>(p), transfer_samples };
} else {
return { };
}
}
} /* namespace dma */
} /* namespace baseband */

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __BASEBAND_DMA_H__
#define __BASEBAND_DMA_H__
#include <cstddef>
#include <array>
#include "complex.hpp"
#include "baseband.hpp"
namespace baseband {
namespace dma {
void init();
void configure(
baseband::sample_t* const buffer_base,
const baseband::Direction direction
);
void enable(const baseband::Direction direction);
bool is_enabled();
void disable();
baseband::buffer_t wait_for_buffer();
} /* namespace dma */
} /* namespace baseband */
#endif/*__BASEBAND_DMA_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "baseband_processor.hpp"
#include "portapack_shared_memory.hpp"
#include "message.hpp"
void BasebandProcessor::feed_channel_stats(const buffer_c16_t& channel) {
channel_stats.feed(
channel,
[](const ChannelStatistics& statistics) {
const ChannelStatisticsMessage channel_stats_message { statistics };
shared_memory.application_queue.push(channel_stats_message);
}
);
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __BASEBAND_PROCESSOR_H__
#define __BASEBAND_PROCESSOR_H__
#include "dsp_types.hpp"
#include "channel_stats_collector.hpp"
#include "message.hpp"
class BasebandProcessor {
public:
virtual ~BasebandProcessor() = default;
virtual void execute(const buffer_c8_t& buffer) = 0;
virtual void on_message(const Message* const) { };
protected:
void feed_channel_stats(const buffer_c16_t& channel);
private:
ChannelStatsCollector channel_stats { };
};
#endif/*__BASEBAND_PROCESSOR_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "baseband_stats_collector.hpp"
#include "lpc43xx_cpp.hpp"
bool BasebandStatsCollector::process(const buffer_c8_t& buffer) {
samples += buffer.count;
const size_t report_samples = buffer.sampling_rate * report_interval;
const auto report_delta = samples - samples_last_report;
return report_delta >= report_samples;
}
BasebandStatistics BasebandStatsCollector::capture_statistics() {
BasebandStatistics statistics;
const auto idle_ticks = thread_idle->total_ticks;
statistics.idle_ticks = (idle_ticks - last_idle_ticks);
last_idle_ticks = idle_ticks;
const auto main_ticks = thread_main->total_ticks;
statistics.main_ticks = (main_ticks - last_main_ticks);
last_main_ticks = main_ticks;
const auto rssi_ticks = thread_rssi->total_ticks;
statistics.rssi_ticks = (rssi_ticks - last_rssi_ticks);
last_rssi_ticks = rssi_ticks;
const auto baseband_ticks = thread_baseband->total_ticks;
statistics.baseband_ticks = (baseband_ticks - last_baseband_ticks);
last_baseband_ticks = baseband_ticks;
statistics.saturation = lpc43xx::m4::flag_saturation();
lpc43xx::m4::clear_flag_saturation();
samples_last_report = samples;
return statistics;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __BASEBAND_STATS_COLLECTOR_H__
#define __BASEBAND_STATS_COLLECTOR_H__
#include "ch.h"
#include "dsp_types.hpp"
#include "message.hpp"
#include <cstdint>
#include <cstddef>
class BasebandStatsCollector {
public:
BasebandStatsCollector(
const Thread* const thread_idle,
const Thread* const thread_main,
const Thread* const thread_rssi,
const Thread* const thread_baseband
) : thread_idle { thread_idle },
thread_main { thread_main },
thread_rssi { thread_rssi },
thread_baseband { thread_baseband }
{
}
template<typename Callback>
void process(const buffer_c8_t& buffer, Callback callback) {
if( process(buffer) ) {
callback(capture_statistics());
}
}
private:
static constexpr float report_interval { 1.0f };
size_t samples { 0 };
size_t samples_last_report { 0 };
const Thread* const thread_idle;
uint32_t last_idle_ticks { 0 };
const Thread* const thread_main;
uint32_t last_main_ticks { 0 };
const Thread* const thread_rssi;
uint32_t last_rssi_ticks { 0 };
const Thread* const thread_baseband;
uint32_t last_baseband_ticks { 0 };
bool process(const buffer_c8_t& buffer);
BasebandStatistics capture_statistics();
};
#endif/*__BASEBAND_STATS_COLLECTOR_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "baseband_thread.hpp"
#include "dsp_types.hpp"
#include "baseband.hpp"
#include "baseband_sgpio.hpp"
#include "baseband_dma.hpp"
#include "rssi.hpp"
#include "i2s.hpp"
using namespace lpc43xx;
#include "portapack_shared_memory.hpp"
#include "utility.hpp"
#include <array>
static baseband::SGPIO baseband_sgpio;
WORKING_AREA(baseband_thread_wa, 4096);
Thread* BasebandThread::thread = nullptr;
BasebandThread::BasebandThread(
uint32_t sampling_rate,
BasebandProcessor* const baseband_processor,
const tprio_t priority,
baseband::Direction direction
) : baseband_processor { baseband_processor },
_direction { direction },
sampling_rate { sampling_rate }
{
thread = chThdCreateStatic(baseband_thread_wa, sizeof(baseband_thread_wa),
priority, ThreadBase::fn,
this
);
}
BasebandThread::~BasebandThread() {
chThdTerminate(thread);
chThdWait(thread);
thread = nullptr;
}
void BasebandThread::set_sampling_rate(uint32_t new_sampling_rate) {
sampling_rate = new_sampling_rate;
}
void BasebandThread::run() {
baseband_sgpio.init();
baseband::dma::init();
const auto baseband_buffer = std::make_unique<std::array<baseband::sample_t, 8192>>();
baseband::dma::configure(
baseband_buffer->data(),
direction()
);
//baseband::dma::allocate(4, 2048);
baseband_sgpio.configure(direction());
baseband::dma::enable(direction());
baseband_sgpio.streaming_enable();
while( !chThdShouldTerminate() ) {
// TODO: Place correct sampling rate into buffer returned here:
const auto buffer_tmp = baseband::dma::wait_for_buffer();
if( buffer_tmp ) {
buffer_c8_t buffer {
buffer_tmp.p, buffer_tmp.count, sampling_rate
};
if( baseband_processor ) {
baseband_processor->execute(buffer);
}
}
}
i2s::i2s0::tx_mute();
baseband::dma::disable();
baseband_sgpio.streaming_disable();
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __BASEBAND_THREAD_H__
#define __BASEBAND_THREAD_H__
#include "thread_base.hpp"
#include "message.hpp"
#include "baseband_processor.hpp"
#include <ch.h>
class BasebandThread : public ThreadBase {
public:
BasebandThread(
uint32_t sampling_rate,
BasebandProcessor* const baseband_processor,
const tprio_t priority,
const baseband::Direction direction = baseband::Direction::Receive
);
~BasebandThread();
BasebandThread(const BasebandThread&) = delete;
BasebandThread(BasebandThread&&) = delete;
BasebandThread& operator=(const BasebandThread&) = delete;
BasebandThread& operator=(BasebandThread&&) = delete;
// This getter should die, it's just here to leak information to code that
// isn't in the right place to begin with.
baseband::Direction direction() const {
return _direction;
}
void set_sampling_rate(uint32_t new_sampling_rate);
private:
static Thread* thread;
BasebandProcessor* baseband_processor { nullptr };
baseband::Direction _direction { baseband::Direction::Receive };
uint32_t sampling_rate { 0 };
void run() override;
};
#endif/*__BASEBAND_THREAD_H__*/

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __BLOCK_DECIMATOR_H__
#define __BLOCK_DECIMATOR_H__
#include <cstdint>
#include <cstddef>
#include <array>
#include "dsp_types.hpp"
#include "complex.hpp"
template<typename T, size_t N>
class BlockDecimator {
public:
constexpr BlockDecimator(
const size_t factor
) : factor_ { factor }
{
}
void set_input_sampling_rate(const uint32_t new_sampling_rate) {
if( new_sampling_rate != input_sampling_rate() ) {
input_sampling_rate_ = new_sampling_rate;
reset_state();
}
}
uint32_t input_sampling_rate() const {
return input_sampling_rate_;
}
void set_factor(const size_t new_factor) {
if( new_factor != factor() ) {
factor_ = new_factor;
reset_state();
}
}
size_t factor() const {
return factor_;
}
uint32_t output_sampling_rate() const {
return input_sampling_rate() / factor();
}
template<typename BlockCallback>
void feed(const buffer_t<T>& src, BlockCallback callback) {
/* NOTE: Input block size must be >= factor */
set_input_sampling_rate(src.sampling_rate);
while( src_i < src.count ) {
buffer[dst_i++] = src.p[src_i];
if( dst_i == buffer.size() ) {
callback({ buffer.data(), buffer.size(), output_sampling_rate() });
reset_state();
dst_i = 0;
}
src_i += factor();
}
src_i -= src.count;
}
private:
std::array<T, N> buffer { };
uint32_t input_sampling_rate_ { 0 };
size_t factor_ { 1 };
size_t src_i { 0 };
size_t dst_i { 0 };
void reset_state() {
src_i = 0;
dst_i = 0;
}
};
#endif/*__BLOCK_DECIMATOR_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "channel_decimator.hpp"
buffer_c16_t ChannelDecimator::execute_decimation(const buffer_c8_t& buffer) {
const buffer_c16_t work_baseband_buffer {
work_baseband.data(),
work_baseband.size()
};
const buffer_s16_t work_audio_buffer {
(int16_t*)work_baseband.data(),
sizeof(work_baseband) / sizeof(int16_t)
};
/* 3.072MHz complex<int8_t>[2048], [-128, 127]
* -> Shift by -fs/4
* -> 3rd order CIC: -0.1dB @ 0.028fs, -1dB @ 0.088fs, -60dB @ 0.468fs
* -0.1dB @ 86kHz, -1dB @ 270kHz, -60dB @ 1.44MHz
* -> gain of 256
* -> decimation by 2
* -> 1.544MHz complex<int16_t>[1024], [-32768, 32512] */
auto stage_0_out = execute_stage_0(buffer, work_baseband_buffer);
if( decimation_factor == DecimationFactor::By2 ) {
return stage_0_out;
}
/* 1.536MHz complex<int16_t>[1024], [-32768, 32512]
* -> 3rd order CIC: -0.1dB @ 0.028fs, -1dB @ 0.088fs, -60dB @ 0.468fs
* -0.1dB @ 43kHz, -1dB @ 136kHz, -60dB @ 723kHz
* -> gain of 1
* -> decimation by 2
* -> 768kHz complex<int16_t>[512], [-8192, 8128] */
auto cic_1_out = cic_1.execute(stage_0_out, work_baseband_buffer);
if( decimation_factor == DecimationFactor::By4 ) {
return cic_1_out;
}
/* 768kHz complex<int16_t>[512], [-32768, 32512]
* -> 3rd order CIC decimation by 2, gain of 1
* -> 384kHz complex<int16_t>[256], [-32768, 32512] */
auto cic_2_out = cic_2.execute(cic_1_out, work_baseband_buffer);
if( decimation_factor == DecimationFactor::By8 ) {
return cic_2_out;
}
/* 384kHz complex<int16_t>[256], [-32768, 32512]
* -> 3rd order CIC decimation by 2, gain of 1
* -> 192kHz complex<int16_t>[128], [-32768, 32512] */
auto cic_3_out = cic_3.execute(cic_2_out, work_baseband_buffer);
if( decimation_factor == DecimationFactor::By16 ) {
return cic_3_out;
}
/* 192kHz complex<int16_t>[128], [-32768, 32512]
* -> 3rd order CIC decimation by 2, gain of 1
* -> 96kHz complex<int16_t>[64], [-32768, 32512] */
auto cic_4_out = cic_4.execute(cic_3_out, work_baseband_buffer);
return cic_4_out;
}
buffer_c16_t ChannelDecimator::execute_stage_0(
const buffer_c8_t& buffer,
const buffer_c16_t& work_baseband_buffer
) {
if( fs_over_4_downconvert ) {
return translate.execute(buffer, work_baseband_buffer);
} else {
return cic_0.execute(buffer, work_baseband_buffer);
}
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __CHANNEL_DECIMATOR_H__
#define __CHANNEL_DECIMATOR_H__
#include "buffer.hpp"
#include "complex.hpp"
#include "dsp_decimate.hpp"
#include <array>
class ChannelDecimator {
public:
enum class DecimationFactor {
By2,
By4,
By8,
By16,
By32,
};
constexpr ChannelDecimator(
const DecimationFactor decimation_factor,
const bool fs_over_4_downconvert = true
) : decimation_factor { decimation_factor },
fs_over_4_downconvert { fs_over_4_downconvert }
{
}
void set_decimation_factor(const DecimationFactor f) {
decimation_factor = f;
}
buffer_c16_t execute(const buffer_c8_t& buffer) {
auto decimated = execute_decimation(buffer);
return decimated;
}
private:
std::array<complex16_t, 1024> work_baseband { };
dsp::decimate::TranslateByFSOver4AndDecimateBy2CIC3 translate { };
dsp::decimate::Complex8DecimateBy2CIC3 cic_0 { };
dsp::decimate::DecimateBy2CIC3 cic_1 { };
dsp::decimate::DecimateBy2CIC3 cic_2 { };
dsp::decimate::DecimateBy2CIC3 cic_3 { };
dsp::decimate::DecimateBy2CIC3 cic_4 { };
DecimationFactor decimation_factor { DecimationFactor::By32 };
const bool fs_over_4_downconvert { true };
buffer_c16_t execute_decimation(const buffer_c8_t& buffer);
buffer_c16_t execute_stage_0(
const buffer_c8_t& buffer,
const buffer_c16_t& work_baseband_buffer
);
};
#endif/*__CHANNEL_DECIMATOR_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __CHANNEL_STATS_COLLECTOR_H__
#define __CHANNEL_STATS_COLLECTOR_H__
#include "dsp_types.hpp"
#include "message.hpp"
#include "utility.hpp"
#include <cstdint>
#include <cstddef>
#include <hal.h>
class ChannelStatsCollector {
public:
template<typename Callback>
void feed(const buffer_c16_t& src, Callback callback) {
void *src_p = src.p;
while(src_p < &src.p[src.count]) {
const uint32_t sample = *__SIMD32(src_p)++;
const uint32_t mag_sq = __SMUAD(sample, sample);
if( mag_sq > max_squared ) {
max_squared = mag_sq;
}
}
count += src.count;
const size_t samples_per_update = src.sampling_rate * update_interval;
if( count >= samples_per_update ) {
const float max_squared_f = max_squared;
const int32_t max_db = mag2_to_dbv_norm(max_squared_f * (1.0f / (32768.0f * 32768.0f)));
callback({ max_db, count });
max_squared = 0;
count = 0;
}
}
private:
static constexpr float update_interval { 0.1f };
uint32_t max_squared { 0 };
size_t count { 0 };
};
#endif/*__CHANNEL_STATS_COLLECTOR_H__*/

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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Copyright (C) 2014 Jared Boone, ShareBrained Technology
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file templates/chconf.h
* @brief Configuration file template.
* @details A copy of this file must be placed in each project directory, it
* contains the application specific kernel settings.
*
* @addtogroup config
* @details Kernel related settings and hooks.
* @{
*/
#ifndef _CHCONF_H_
#define _CHCONF_H_
/*===========================================================================*/
/**
* @name Kernel parameters and options
* @{
*/
/*===========================================================================*/
/**
* @brief System tick frequency.
* @details Frequency of the system timer that drives the system ticks. This
* setting also defines the system tick time unit.
*/
#if !defined(CH_FREQUENCY) || defined(__DOXYGEN__)
#define CH_FREQUENCY 1000
#endif
/**
* @brief Round robin interval.
* @details This constant is the number of system ticks allowed for the
* threads before preemption occurs. Setting this value to zero
* disables the preemption for threads with equal priority and the
* round robin becomes cooperative. Note that higher priority
* threads can still preempt, the kernel is always preemptive.
*
* @note Disabling the round robin preemption makes the kernel more compact
* and generally faster.
*/
#if !defined(CH_TIME_QUANTUM) || defined(__DOXYGEN__)
#define CH_TIME_QUANTUM 0
#endif
/**
* @brief Managed RAM size.
* @details Size of the RAM area to be managed by the OS. If set to zero
* then the whole available RAM is used. The core memory is made
* available to the heap allocator and/or can be used directly through
* the simplified core memory allocator.
*
* @note In order to let the OS manage the whole RAM the linker script must
* provide the @p __heap_base__ and @p __heap_end__ symbols.
* @note Requires @p CH_USE_MEMCORE.
*/
#if !defined(CH_MEMCORE_SIZE) || defined(__DOXYGEN__)
#define CH_MEMCORE_SIZE 0
#endif
/**
* @brief Idle thread automatic spawn suppression.
* @details When this option is activated the function @p chSysInit()
* does not spawn the idle thread automatically. The application has
* then the responsibility to do one of the following:
* - Spawn a custom idle thread at priority @p IDLEPRIO.
* - Change the main() thread priority to @p IDLEPRIO then enter
* an endless loop. In this scenario the @p main() thread acts as
* the idle thread.
* .
* @note Unless an idle thread is spawned the @p main() thread must not
* enter a sleep state.
*/
#if !defined(CH_NO_IDLE_THREAD) || defined(__DOXYGEN__)
#define CH_NO_IDLE_THREAD FALSE
#endif
/** @} */
/*===========================================================================*/
/**
* @name Performance options
* @{
*/
/*===========================================================================*/
/**
* @brief OS optimization.
* @details If enabled then time efficient rather than space efficient code
* is used when two possible implementations exist.
*
* @note This is not related to the compiler optimization options.
* @note The default is @p TRUE.
*/
#if !defined(CH_OPTIMIZE_SPEED) || defined(__DOXYGEN__)
#define CH_OPTIMIZE_SPEED TRUE
#endif
/** @} */
/*===========================================================================*/
/**
* @name Subsystem options
* @{
*/
/*===========================================================================*/
/**
* @brief Threads registry APIs.
* @details If enabled then the registry APIs are included in the kernel.
*
* @note The default is @p TRUE.
*/
#if !defined(CH_USE_REGISTRY) || defined(__DOXYGEN__)
#define CH_USE_REGISTRY FALSE
#endif
/**
* @brief Threads synchronization APIs.
* @details If enabled then the @p chThdWait() function is included in
* the kernel.
*
* @note The default is @p TRUE.
*/
#if !defined(CH_USE_WAITEXIT) || defined(__DOXYGEN__)
#define CH_USE_WAITEXIT TRUE
#endif
/**
* @brief Semaphores APIs.
* @details If enabled then the Semaphores APIs are included in the kernel.
*
* @note The default is @p TRUE.
*/
#if !defined(CH_USE_SEMAPHORES) || defined(__DOXYGEN__)
#define CH_USE_SEMAPHORES TRUE
#endif
/**
* @brief Semaphores queuing mode.
* @details If enabled then the threads are enqueued on semaphores by
* priority rather than in FIFO order.
*
* @note The default is @p FALSE. Enable this if you have special requirements.
* @note Requires @p CH_USE_SEMAPHORES.
*/
#if !defined(CH_USE_SEMAPHORES_PRIORITY) || defined(__DOXYGEN__)
#define CH_USE_SEMAPHORES_PRIORITY FALSE
#endif
/**
* @brief Atomic semaphore API.
* @details If enabled then the semaphores the @p chSemSignalWait() API
* is included in the kernel.
*
* @note The default is @p TRUE.
* @note Requires @p CH_USE_SEMAPHORES.
*/
#if !defined(CH_USE_SEMSW) || defined(__DOXYGEN__)
#define CH_USE_SEMSW TRUE
#endif
/**
* @brief Mutexes APIs.
* @details If enabled then the mutexes APIs are included in the kernel.
*
* @note The default is @p TRUE.
*/
#if !defined(CH_USE_MUTEXES) || defined(__DOXYGEN__)
#define CH_USE_MUTEXES TRUE
#endif
/**
* @brief Conditional Variables APIs.
* @details If enabled then the conditional variables APIs are included
* in the kernel.
*
* @note The default is @p TRUE.
* @note Requires @p CH_USE_MUTEXES.
*/
#if !defined(CH_USE_CONDVARS) || defined(__DOXYGEN__)
#define CH_USE_CONDVARS TRUE
#endif
/**
* @brief Conditional Variables APIs with timeout.
* @details If enabled then the conditional variables APIs with timeout
* specification are included in the kernel.
*
* @note The default is @p TRUE.
* @note Requires @p CH_USE_CONDVARS.
*/
#if !defined(CH_USE_CONDVARS_TIMEOUT) || defined(__DOXYGEN__)
#define CH_USE_CONDVARS_TIMEOUT TRUE
#endif
/**
* @brief Events Flags APIs.
* @details If enabled then the event flags APIs are included in the kernel.
*
* @note The default is @p TRUE.
*/
#if !defined(CH_USE_EVENTS) || defined(__DOXYGEN__)
#define CH_USE_EVENTS TRUE
#endif
/**
* @brief Events Flags APIs with timeout.
* @details If enabled then the events APIs with timeout specification
* are included in the kernel.
*
* @note The default is @p TRUE.
* @note Requires @p CH_USE_EVENTS.
*/
#if !defined(CH_USE_EVENTS_TIMEOUT) || defined(__DOXYGEN__)
#define CH_USE_EVENTS_TIMEOUT TRUE
#endif
/**
* @brief Synchronous Messages APIs.
* @details If enabled then the synchronous messages APIs are included
* in the kernel.
*
* @note The default is @p TRUE.
*/
#if !defined(CH_USE_MESSAGES) || defined(__DOXYGEN__)
#define CH_USE_MESSAGES TRUE
#endif
/**
* @brief Synchronous Messages queuing mode.
* @details If enabled then messages are served by priority rather than in
* FIFO order.
*
* @note The default is @p FALSE. Enable this if you have special requirements.
* @note Requires @p CH_USE_MESSAGES.
*/
#if !defined(CH_USE_MESSAGES_PRIORITY) || defined(__DOXYGEN__)
#define CH_USE_MESSAGES_PRIORITY FALSE
#endif
/**
* @brief Mailboxes APIs.
* @details If enabled then the asynchronous messages (mailboxes) APIs are
* included in the kernel.
*
* @note The default is @p TRUE.
* @note Requires @p CH_USE_SEMAPHORES.
*/
#if !defined(CH_USE_MAILBOXES) || defined(__DOXYGEN__)
#define CH_USE_MAILBOXES TRUE
#endif
/**
* @brief I/O Queues APIs.
* @details If enabled then the I/O queues APIs are included in the kernel.
*
* @note The default is @p TRUE.
*/
#if !defined(CH_USE_QUEUES) || defined(__DOXYGEN__)
#define CH_USE_QUEUES TRUE
#endif
/**
* @brief Core Memory Manager APIs.
* @details If enabled then the core memory manager APIs are included
* in the kernel.
*
* @note The default is @p TRUE.
*/
#if !defined(CH_USE_MEMCORE) || defined(__DOXYGEN__)
#define CH_USE_MEMCORE TRUE
#endif
/**
* @brief Heap Allocator APIs.
* @details If enabled then the memory heap allocator APIs are included
* in the kernel.
*
* @note The default is @p TRUE.
* @note Requires @p CH_USE_MEMCORE and either @p CH_USE_MUTEXES or
* @p CH_USE_SEMAPHORES.
* @note Mutexes are recommended.
*/
#if !defined(CH_USE_HEAP) || defined(__DOXYGEN__)
#define CH_USE_HEAP TRUE
#endif
/**
* @brief C-runtime allocator.
* @details If enabled the the heap allocator APIs just wrap the C-runtime
* @p malloc() and @p free() functions.
*
* @note The default is @p FALSE.
* @note Requires @p CH_USE_HEAP.
* @note The C-runtime may or may not require @p CH_USE_MEMCORE, see the
* appropriate documentation.
*/
#if !defined(CH_USE_MALLOC_HEAP) || defined(__DOXYGEN__)
#define CH_USE_MALLOC_HEAP FALSE
#endif
/**
* @brief Memory Pools Allocator APIs.
* @details If enabled then the memory pools allocator APIs are included
* in the kernel.
*
* @note The default is @p TRUE.
*/
#if !defined(CH_USE_MEMPOOLS) || defined(__DOXYGEN__)
#define CH_USE_MEMPOOLS TRUE
#endif
/**
* @brief Dynamic Threads APIs.
* @details If enabled then the dynamic threads creation APIs are included
* in the kernel.
*
* @note The default is @p TRUE.
* @note Requires @p CH_USE_WAITEXIT.
* @note Requires @p CH_USE_HEAP and/or @p CH_USE_MEMPOOLS.
*/
#if !defined(CH_USE_DYNAMIC) || defined(__DOXYGEN__)
#define CH_USE_DYNAMIC TRUE
#endif
/** @} */
/*===========================================================================*/
/**
* @name Debug options
* @{
*/
/*===========================================================================*/
/**
* @brief Debug option, system state check.
* @details If enabled the correct call protocol for system APIs is checked
* at runtime.
*
* @note The default is @p FALSE.
*/
#if !defined(CH_DBG_SYSTEM_STATE_CHECK) || defined(__DOXYGEN__)
#define CH_DBG_SYSTEM_STATE_CHECK TRUE
#endif
/**
* @brief Debug option, parameters checks.
* @details If enabled then the checks on the API functions input
* parameters are activated.
*
* @note The default is @p FALSE.
*/
#if !defined(CH_DBG_ENABLE_CHECKS) || defined(__DOXYGEN__)
#define CH_DBG_ENABLE_CHECKS TRUE
#endif
/**
* @brief Debug option, consistency checks.
* @details If enabled then all the assertions in the kernel code are
* activated. This includes consistency checks inside the kernel,
* runtime anomalies and port-defined checks.
*
* @note The default is @p FALSE.
*/
#if !defined(CH_DBG_ENABLE_ASSERTS) || defined(__DOXYGEN__)
#define CH_DBG_ENABLE_ASSERTS TRUE
#endif
/**
* @brief Debug option, trace buffer.
* @details If enabled then the context switch circular trace buffer is
* activated.
*
* @note The default is @p FALSE.
*/
#if !defined(CH_DBG_ENABLE_TRACE) || defined(__DOXYGEN__)
#define CH_DBG_ENABLE_TRACE FALSE
#endif
/**
* @brief Debug option, stack checks.
* @details If enabled then a runtime stack check is performed.
*
* @note The default is @p FALSE.
* @note The stack check is performed in a architecture/port dependent way.
* It may not be implemented or some ports.
* @note The default failure mode is to halt the system with the global
* @p panic_msg variable set to @p NULL.
*/
#if !defined(CH_DBG_ENABLE_STACK_CHECK) || defined(__DOXYGEN__)
#define CH_DBG_ENABLE_STACK_CHECK TRUE
#endif
/**
* @brief Debug option, stacks initialization.
* @details If enabled then the threads working area is filled with a byte
* value when a thread is created. This can be useful for the
* runtime measurement of the used stack.
*
* @note The default is @p FALSE.
*/
#if !defined(CH_DBG_FILL_THREADS) || defined(__DOXYGEN__)
#define CH_DBG_FILL_THREADS TRUE
#endif
/**
* @brief Debug option, threads profiling.
* @details If enabled then a field is added to the @p Thread structure that
* counts the system ticks occurred while executing the thread.
*
* @note The default is @p TRUE.
* @note This debug option is defaulted to TRUE because it is required by
* some test cases into the test suite.
*/
#if !defined(CH_DBG_THREADS_PROFILING) || defined(__DOXYGEN__)
#define CH_DBG_THREADS_PROFILING TRUE
#endif
/** @} */
/*===========================================================================*/
/**
* @name Kernel hooks
* @{
*/
/*===========================================================================*/
/**
* @brief Threads descriptor structure extension.
* @details User fields added to the end of the @p Thread structure.
*/
#if !defined(THREAD_EXT_FIELDS) || defined(__DOXYGEN__)
#define THREAD_EXT_FIELDS \
/* Add threads custom fields here.*/ \
uint32_t switches; \
uint32_t start_ticks; \
uint32_t total_ticks;
#endif
/**
* @brief Threads initialization hook.
* @details User initialization code added to the @p chThdInit() API.
*
* @note It is invoked from within @p chThdInit() and implicitly from all
* the threads creation APIs.
*/
#if !defined(THREAD_EXT_INIT_HOOK) || defined(__DOXYGEN__)
#define THREAD_EXT_INIT_HOOK(tp) { \
/* Add threads initialization code here.*/ \
tp->switches = 0; \
tp->start_ticks = 0; \
tp->total_ticks = 0; \
}
#endif
/**
* @brief Threads finalization hook.
* @details User finalization code added to the @p chThdExit() API.
*
* @note It is inserted into lock zone.
* @note It is also invoked when the threads simply return in order to
* terminate.
*/
#if !defined(THREAD_EXT_EXIT_HOOK) || defined(__DOXYGEN__)
#define THREAD_EXT_EXIT_HOOK(tp) { \
/* Add threads finalization code here.*/ \
}
#endif
/**
* @brief Context switch hook.
* @details This hook is invoked just before switching between threads.
*/
#if !defined(THREAD_CONTEXT_SWITCH_HOOK) || defined(__DOXYGEN__)
#define THREAD_CONTEXT_SWITCH_HOOK(ntp, otp) { \
/* System halt code here.*/ \
otp->switches++; \
ntp->start_ticks = *((volatile uint32_t*)0x400C4008); \
otp->total_ticks += (ntp->start_ticks - otp->start_ticks); \
}
#endif
/**
* @brief Idle Loop hook.
* @details This hook is continuously invoked by the idle thread loop.
*/
#if !defined(IDLE_LOOP_HOOK) || defined(__DOXYGEN__)
#define IDLE_LOOP_HOOK() { \
/* Idle loop code here.*/ \
}
#endif
/**
* @brief System tick event hook.
* @details This hook is invoked in the system tick handler immediately
* after processing the virtual timers queue.
*/
#if !defined(SYSTEM_TICK_EVENT_HOOK) || defined(__DOXYGEN__)
#define SYSTEM_TICK_EVENT_HOOK() { \
/* System tick event code here.*/ \
}
#endif
/**
* @brief System halt hook.
* @details This hook is invoked in case to a system halting error before
* the system is halted.
*/
#if !defined(SYSTEM_HALT_HOOK) || defined(__DOXYGEN__)
#define SYSTEM_HALT_HOOK() { \
/* System halt code here.*/ \
}
#endif
/** @} */
/*===========================================================================*/
/* Port-specific settings (override port settings defaulted in chcore.h). */
/*===========================================================================*/
/* NOTE: When changing this option you also have to enable or disable the FPU
in the project options.*/
#define CORTEX_USE_FPU TRUE
#define CORTEX_ENABLE_WFI_IDLE TRUE
#endif /* _CHCONF_H_ */
/** @} */

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "clock_recovery.hpp"

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __CLOCK_RECOVERY_H__
#define __CLOCK_RECOVERY_H__
#include <cstddef>
#include <array>
#include <functional>
#include "linear_resampler.hpp"
namespace clock_recovery {
class GardnerTimingErrorDetector {
public:
static constexpr size_t samples_per_symbol { 2 };
/*
Expects retimed samples at a rate of twice the expected symbol rate.
Calculates timing error, sends symbol and error to handler.
*/
template<typename SymbolHandler>
void operator()(
const float in,
SymbolHandler symbol_handler
) {
/* NOTE: Algorithm is sensitive to input magnitude. Timing error value
* will scale proportionally. Best practice is to use error sign only.
*/
t[2] = t[1];
t[1] = t[0];
t[0] = in;
if( symbol_phase == 0 ) {
const auto symbol = t[0];
const float lateness = (t[0] - t[2]) * t[1];
symbol_handler(symbol, lateness);
}
symbol_phase = (symbol_phase + 1) % samples_per_symbol;
}
private:
std::array<float, 3> t { };
size_t symbol_phase { 0 };
};
class LinearErrorFilter {
public:
LinearErrorFilter(
const float filter_alpha = 0.95f,
const float error_weight = -1.0f
) : filter_alpha { filter_alpha },
error_weight { error_weight }
{
}
float operator()(
const float error
) {
error_filtered = filter_alpha * error_filtered + (1.0f - filter_alpha) * error;
return error_filtered * error_weight;
}
private:
const float filter_alpha;
const float error_weight;
float error_filtered { 0.0f };
};
class FixedErrorFilter {
public:
FixedErrorFilter(
) {
}
FixedErrorFilter(
const float weight
) : weight_ { weight }
{
}
float operator()(
const float lateness
) const {
return (lateness < 0.0f) ? weight() : -weight();
}
float weight() const {
return weight_;
}
private:
float weight_ { 1.0f / 16.0f };
};
template<typename ErrorFilter>
class ClockRecovery {
public:
using SymbolHandler = std::function<void(const float)>;
ClockRecovery(
const float sampling_rate,
const float symbol_rate,
ErrorFilter error_filter,
SymbolHandler symbol_handler
) : symbol_handler { std::move(symbol_handler) }
{
configure(sampling_rate, symbol_rate, error_filter);
}
ClockRecovery(
SymbolHandler symbol_handler
) : symbol_handler { std::move(symbol_handler) }
{
}
void configure(
const float sampling_rate,
const float symbol_rate,
ErrorFilter error_filter
) {
resampler.configure(sampling_rate, symbol_rate * timing_error_detector.samples_per_symbol);
error_filter = error_filter;
}
void operator()(
const float baseband_sample
) {
resampler(baseband_sample,
[this](const float interpolated_sample) {
this->resampler_callback(interpolated_sample);
}
);
}
private:
dsp::interpolation::LinearResampler resampler { };
GardnerTimingErrorDetector timing_error_detector { };
ErrorFilter error_filter { };
const SymbolHandler symbol_handler;
void resampler_callback(const float interpolated_sample) {
timing_error_detector(interpolated_sample,
[this](const float symbol, const float lateness) {
this->symbol_callback(symbol, lateness);
}
);
}
void symbol_callback(const float symbol, const float lateness) {
// NOTE: This check is to avoid std::function nullptr check, which
// brings in "_ZSt25__throw_bad_function_callv" and a lot of extra code.
// TODO: Make symbol_handler known at compile time.
if( symbol_handler) {
symbol_handler(symbol);
}
const float adjustment = error_filter(lateness);
resampler.advance(adjustment);
}
};
} /* namespace clock_recovery */
#endif/*__CLOCK_RECOVERY_H__*/

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Original firmware's functionalities: Receiver.

790
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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "dsp_decimate.hpp"
#include <hal.h>
namespace dsp {
namespace decimate {
static inline complex32_t mac_fs4_shift(
const vec2_s16* const z,
const vec2_s16* const t,
const size_t index,
const complex32_t accum
) {
/* Accumulate sample * tap results for samples already in z buffer.
* Multiply using swap/negation to achieve Fs/4 shift.
* For iterations where samples are shifting out of z buffer (being discarded).
* Expect negated tap t[2] to accomodate instruction set limitations.
*/
const bool negated_t2 = index & 1;
const auto q1_i0 = z[index*2 + 0];
const auto i1_q0 = z[index*2 + 1];
const auto t1_t0 = t[index];
const auto real = negated_t2 ? smlsd(q1_i0, t1_t0, accum.real()) : smlad(q1_i0, t1_t0, accum.real());
const auto imag = negated_t2 ? smlad(i1_q0, t1_t0, accum.imag()) : smlsd(i1_q0, t1_t0, accum.imag());
return { real, imag };
}
static inline complex32_t mac_shift(
const vec2_s16* const z,
const vec2_s16* const t,
const size_t index,
const complex32_t accum
) {
/* Accumulate sample * tap results for samples already in z buffer.
* For iterations where samples are shifting out of z buffer (being discarded).
* real += i1 * t1 + i0 * t0
* imag += q1 * t1 + q0 * t0
*/
const auto i1_i0 = z[index*2 + 0];
const auto q1_q0 = z[index*2 + 1];
const auto t1_t0 = t[index];
const auto real = smlad(i1_i0, t1_t0, accum.real());
const auto imag = smlad(q1_q0, t1_t0, accum.imag());
return { real, imag };
}
static inline complex32_t mac_fs4_shift_and_store(
vec2_s16* const z,
const vec2_s16* const t,
const size_t decimation_factor,
const size_t index,
const complex32_t accum
) {
/* Accumulate sample * tap results for samples already in z buffer.
* Place new samples into z buffer.
* Expect negated tap t[2] to accomodate instruction set limitations.
*/
const bool negated_t2 = index & 1;
const auto q1_i0 = z[decimation_factor + index*2 + 0];
const auto i1_q0 = z[decimation_factor + index*2 + 1];
const auto t1_t0 = t[decimation_factor / 2 + index];
z[index*2 + 0] = q1_i0;
const auto real = negated_t2 ? smlsd(q1_i0, t1_t0, accum.real()) : smlad(q1_i0, t1_t0, accum.real());
z[index*2 + 1] = i1_q0;
const auto imag = negated_t2 ? smlad(i1_q0, t1_t0, accum.imag()) : smlsd(i1_q0, t1_t0, accum.imag());
return { real, imag };
}
static inline complex32_t mac_shift_and_store(
vec2_s16* const z,
const vec2_s16* const t,
const size_t decimation_factor,
const size_t index,
const complex32_t accum
) {
/* Accumulate sample * tap results for samples already in z buffer.
* Place new samples into z buffer.
* Expect negated tap t[2] to accomodate instruction set limitations.
*/
const auto i1_i0 = z[decimation_factor + index*2 + 0];
const auto q1_q0 = z[decimation_factor + index*2 + 1];
const auto t1_t0 = t[decimation_factor / 2 + index];
z[index*2 + 0] = i1_i0;
const auto real = smlad(i1_i0, t1_t0, accum.real());
z[index*2 + 1] = q1_q0;
const auto imag = smlad(q1_q0, t1_t0, accum.imag());
return { real, imag };
}
static inline complex32_t mac_fs4_shift_and_store_new_c8_samples(
vec2_s16* const z,
const vec2_s16* const t,
const vec4_s8* const in,
const size_t decimation_factor,
const size_t index,
const size_t length,
const complex32_t accum
) {
/* Accumulate sample * tap results for new samples.
* Place new samples into z buffer.
* Expect negated tap t[2] to accomodate instruction set limitations.
*/
const bool negated_t2 = index & 1;
const auto q1_i1_q0_i0 = in[index];
const auto t1_t0 = t[(length - decimation_factor) / 2 + index];
const auto i1_q1_i0_q0 = rev16(q1_i1_q0_i0);
const auto i1_q1_q0_i0 = pkhbt(q1_i1_q0_i0, i1_q1_i0_q0);
const auto q1_i0 = sxtb16(i1_q1_q0_i0);
const auto i1_q0 = sxtb16(i1_q1_q0_i0, 8);
z[length - decimation_factor * 2 + index*2 + 0] = q1_i0;
const auto real = negated_t2 ? smlsd(q1_i0, t1_t0, accum.real()) : smlad(q1_i0, t1_t0, accum.real());
z[length - decimation_factor * 2 + index*2 + 1] = i1_q0;
const auto imag = negated_t2 ? smlad(i1_q0, t1_t0, accum.imag()) : smlsd(i1_q0, t1_t0, accum.imag());
return { real, imag };
}
static inline complex32_t mac_shift_and_store_new_c16_samples(
vec2_s16* const z,
const vec2_s16* const t,
const vec2_s16* const in,
const size_t decimation_factor,
const size_t index,
const size_t length,
const complex32_t accum
) {
/* Accumulate sample * tap results for new samples.
* Place new samples into z buffer.
* Expect negated tap t[2] to accomodate instruction set limitations.
*/
const auto q0_i0 = in[index*2+0];
const auto q1_i1 = in[index*2+1];
const auto i1_i0 = pkhbt(q0_i0, q1_i1, 16);
const auto q1_q0 = pkhtb(q1_i1, q0_i0, 16);
const auto t1_t0 = t[(length - decimation_factor) / 2 + index];
z[length - decimation_factor * 2 + index*2 + 0] = i1_i0;
const auto real = smlad(i1_i0, t1_t0, accum.real());
z[length - decimation_factor * 2 + index*2 + 1] = q1_q0;
const auto imag = smlad(q1_q0, t1_t0, accum.imag());
return { real, imag };
}
static inline uint32_t scale_round_and_pack(
const complex32_t value,
const int32_t scale_factor
) {
/* Multiply 32-bit components of the complex<int32_t> by a scale factor,
* into int64_ts, then round to nearest LSB (1 << 32), saturate to 16 bits,
* and pack into a complex<int16_t>.
*/
const auto scaled_real = __SMMULR(value.real(), scale_factor);
const auto saturated_real = __SSAT(scaled_real, 16);
const auto scaled_imag = __SMMULR(value.imag(), scale_factor);
const auto saturated_imag = __SSAT(scaled_imag, 16);
return __PKHBT(saturated_real, saturated_imag, 16);
}
template<typename Tap>
static void taps_copy(
const Tap* const source,
Tap* const target,
const size_t count,
const bool shift_up
) {
const uint32_t negate_pattern = shift_up ? 0b1110 : 0b0100;
for(size_t i=0; i<count; i++) {
const bool negate = (negate_pattern >> (i & 3)) & 1;
target[i] = negate ? -source[i] : source[i];
}
}
// FIRC8xR16x24FS4Decim4 //////////////////////////////////////////////////
void FIRC8xR16x24FS4Decim4::configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale,
const Shift shift
) {
taps_copy(taps.data(), taps_.data(), taps_.size(), shift == Shift::Up);
output_scale = scale;
z_.fill({});
}
buffer_c16_t FIRC8xR16x24FS4Decim4::execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
) {
vec2_s16* const z = static_cast<vec2_s16*>(__builtin_assume_aligned(z_.data(), 4));
const vec2_s16* const t = static_cast<vec2_s16*>(__builtin_assume_aligned(taps_.data(), 4));
uint32_t* const d = static_cast<uint32_t*>(__builtin_assume_aligned(dst.p, 4));
const auto k = output_scale;
const size_t count = src.count / decimation_factor;
for(size_t i=0; i<count; i++) {
const vec4_s8* const in = static_cast<const vec4_s8*>(__builtin_assume_aligned(&src.p[i * decimation_factor], 4));
complex32_t accum;
// Oldest samples are discarded.
accum = mac_fs4_shift(z, t, 0, accum);
accum = mac_fs4_shift(z, t, 1, accum);
// Middle samples are shifted earlier in the "z" delay buffer.
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 0, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 1, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 2, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 3, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 4, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 5, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 6, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 7, accum);
// Newest samples come from "in" buffer, are copied to "z" delay buffer.
accum = mac_fs4_shift_and_store_new_c8_samples(z, t, in, decimation_factor, 0, taps_count, accum);
accum = mac_fs4_shift_and_store_new_c8_samples(z, t, in, decimation_factor, 1, taps_count, accum);
d[i] = scale_round_and_pack(accum, k);
}
return {
dst.p,
count,
src.sampling_rate / decimation_factor
};
}
// FIRC8xR16x24FS4Decim8 //////////////////////////////////////////////////
void FIRC8xR16x24FS4Decim8::configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale,
const Shift shift
) {
taps_copy(taps.data(), taps_.data(), taps_.size(), shift == Shift::Up);
output_scale = scale;
z_.fill({});
}
buffer_c16_t FIRC8xR16x24FS4Decim8::execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
) {
vec2_s16* const z = static_cast<vec2_s16*>(__builtin_assume_aligned(z_.data(), 4));
const vec2_s16* const t = static_cast<vec2_s16*>(__builtin_assume_aligned(taps_.data(), 4));
uint32_t* const d = static_cast<uint32_t*>(__builtin_assume_aligned(dst.p, 4));
const auto k = output_scale;
const size_t count = src.count / decimation_factor;
for(size_t i=0; i<count; i++) {
const vec4_s8* const in = static_cast<const vec4_s8*>(__builtin_assume_aligned(&src.p[i * decimation_factor], 4));
complex32_t accum;
// Oldest samples are discarded.
accum = mac_fs4_shift(z, t, 0, accum);
accum = mac_fs4_shift(z, t, 1, accum);
accum = mac_fs4_shift(z, t, 2, accum);
accum = mac_fs4_shift(z, t, 3, accum);
// Middle samples are shifted earlier in the "z" delay buffer.
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 0, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 1, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 2, accum);
accum = mac_fs4_shift_and_store(z, t, decimation_factor, 3, accum);
// Newest samples come from "in" buffer, are copied to "z" delay buffer.
accum = mac_fs4_shift_and_store_new_c8_samples(z, t, in, decimation_factor, 0, taps_count, accum);
accum = mac_fs4_shift_and_store_new_c8_samples(z, t, in, decimation_factor, 1, taps_count, accum);
accum = mac_fs4_shift_and_store_new_c8_samples(z, t, in, decimation_factor, 2, taps_count, accum);
accum = mac_fs4_shift_and_store_new_c8_samples(z, t, in, decimation_factor, 3, taps_count, accum);
d[i] = scale_round_and_pack(accum, k);
}
return {
dst.p,
count,
src.sampling_rate / decimation_factor
};
}
// FIRC16xR16x16Decim2 ////////////////////////////////////////////////////
void FIRC16xR16x16Decim2::configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale
) {
std::copy(taps.cbegin(), taps.cend(), taps_.begin());
output_scale = scale;
z_.fill({});
}
buffer_c16_t FIRC16xR16x16Decim2::execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
) {
vec2_s16* const z = static_cast<vec2_s16*>(__builtin_assume_aligned(z_.data(), 4));
const vec2_s16* const t = static_cast<vec2_s16*>(__builtin_assume_aligned(taps_.data(), 4));
uint32_t* const d = static_cast<uint32_t*>(__builtin_assume_aligned(dst.p, 4));
const auto k = output_scale;
const size_t count = src.count / decimation_factor;
for(size_t i=0; i<count; i++) {
const vec2_s16* const in = static_cast<const vec2_s16*>(__builtin_assume_aligned(&src.p[i * decimation_factor], 4));
complex32_t accum;
// Oldest samples are discarded.
accum = mac_shift(z, t, 0, accum);
// Middle samples are shifted earlier in the "z" delay buffer.
accum = mac_shift_and_store(z, t, decimation_factor, 0, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 1, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 2, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 3, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 4, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 5, accum);
// Newest samples come from "in" buffer, are copied to "z" delay buffer.
accum = mac_shift_and_store_new_c16_samples(z, t, in, decimation_factor, 0, taps_count, accum);
d[i] = scale_round_and_pack(accum, k);
}
return {
dst.p,
count,
src.sampling_rate / decimation_factor
};
}
// FIRC16xR16x32Decim8 ////////////////////////////////////////////////////
void FIRC16xR16x32Decim8::configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale
) {
std::copy(taps.cbegin(), taps.cend(), taps_.begin());
output_scale = scale;
z_.fill({});
}
buffer_c16_t FIRC16xR16x32Decim8::execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
) {
vec2_s16* const z = static_cast<vec2_s16*>(__builtin_assume_aligned(z_.data(), 4));
const vec2_s16* const t = static_cast<vec2_s16*>(__builtin_assume_aligned(taps_.data(), 4));
uint32_t* const d = static_cast<uint32_t*>(__builtin_assume_aligned(dst.p, 4));
const auto k = output_scale;
const size_t count = src.count / decimation_factor;
for(size_t i=0; i<count; i++) {
const vec2_s16* const in = static_cast<const vec2_s16*>(__builtin_assume_aligned(&src.p[i * decimation_factor], 4));
complex32_t accum;
// Oldest samples are discarded.
accum = mac_shift(z, t, 0, accum);
accum = mac_shift(z, t, 1, accum);
accum = mac_shift(z, t, 2, accum);
accum = mac_shift(z, t, 3, accum);
// Middle samples are shifted earlier in the "z" delay buffer.
accum = mac_shift_and_store(z, t, decimation_factor, 0, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 1, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 2, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 3, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 4, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 5, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 6, accum);
accum = mac_shift_and_store(z, t, decimation_factor, 7, accum);
// Newest samples come from "in" buffer, are copied to "z" delay buffer.
accum = mac_shift_and_store_new_c16_samples(z, t, in, decimation_factor, 0, taps_count, accum);
accum = mac_shift_and_store_new_c16_samples(z, t, in, decimation_factor, 1, taps_count, accum);
accum = mac_shift_and_store_new_c16_samples(z, t, in, decimation_factor, 2, taps_count, accum);
accum = mac_shift_and_store_new_c16_samples(z, t, in, decimation_factor, 3, taps_count, accum);
d[i] = scale_round_and_pack(accum, k);
}
return {
dst.p,
count,
src.sampling_rate / decimation_factor
};
}
buffer_c16_t Complex8DecimateBy2CIC3::execute(const buffer_c8_t& src, const buffer_c16_t& dst) {
/* Decimates by two using a non-recursive third-order CIC filter.
*/
/* CIC filter (decimating by two):
* D_I0 = i3 * 1 + i2 * 3 + i1 * 3 + i0 * 1
* D_Q0 = q3 * 1 + q2 * 3 + q1 * 3 + q0 * 1
*
* D_I1 = i5 * 1 + i4 * 3 + i3 * 3 + i2 * 1
* D_Q1 = q5 * 1 + q4 * 3 + q3 * 3 + q2 * 1
*/
uint32_t i1_i0 = _i1_i0;
uint32_t q1_q0 = _q1_q0;
/* 3:1 Scaled by 32 to normalize output to +/-32768-ish. */
constexpr uint32_t scale_factor = 32;
constexpr uint32_t k_3_1 = 0x00030001 * scale_factor;
uint32_t* src_p = reinterpret_cast<uint32_t*>(&src.p[0]);
uint32_t* const src_end = reinterpret_cast<uint32_t*>(&src.p[src.count]);
uint32_t* dst_p = reinterpret_cast<uint32_t*>(&dst.p[0]);
while(src_p < src_end) {
const uint32_t q3_i3_q2_i2 = *(src_p++); // 3
const uint32_t q5_i5_q4_i4 = *(src_p++);
const uint32_t d_i0_partial = __SMUAD(k_3_1, i1_i0); // 1: = 3 * i1 + 1 * i0
const uint32_t i3_i2 = __SXTB16(q3_i3_q2_i2, 0); // 1: (q3_i3_q2_i2 ror 0)[23:16]:(q3_i3_q2_i2 ror 0)[7:0]
const uint32_t d_i0 = __SMLADX(k_3_1, i3_i2, d_i0_partial); // 1: + 3 * i2 + 1 * i3
const uint32_t d_q0_partial = __SMUAD(k_3_1, q1_q0); // 1: = 3 * q1 * 1 * q0
const uint32_t q3_q2 = __SXTB16(q3_i3_q2_i2, 8); // 1: (q3_i3_q2_i2 ror 8)[23:16]:(q3_i3_q2_i2 ror 8)[7:0]
const uint32_t d_q0 = __SMLADX(k_3_1, q3_q2, d_q0_partial); // 1: + 3 * q2 + 1 * q3
const uint32_t d_q0_i0 = __PKHBT(d_i0, d_q0, 16); // 1: (Rm<<16)[31:16]:Rn[15:0]
const uint32_t d_i1_partial = __SMUAD(k_3_1, i3_i2); // 1: = 3 * i3 + 1 * i2
const uint32_t i5_i4 = __SXTB16(q5_i5_q4_i4, 0); // 1: (q5_i5_q4_i4 ror 0)[23:16]:(q5_i5_q4_i4 ror 0)[7:0]
const uint32_t d_i1 = __SMLADX(k_3_1, i5_i4, d_i1_partial); // 1: + 1 * i5 + 3 * i4
const uint32_t d_q1_partial = __SMUAD(k_3_1, q3_q2); // 1: = 3 * q3 * 1 * q2
const uint32_t q5_q4 = __SXTB16(q5_i5_q4_i4, 8); // 1: (q5_i5_q4_i4 ror 8)[23:16]:(q5_i5_q4_i4 ror 8)[7:0]
const uint32_t d_q1 = __SMLADX(k_3_1, q5_q4, d_q1_partial); // 1: + 1 * q5 + 3 * q4
const uint32_t d_q1_i1 = __PKHBT(d_i1, d_q1, 16); // 1: (Rm<<16)[31:16]:Rn[15:0]
*(dst_p++) = d_q0_i0; // 3
*(dst_p++) = d_q1_i1;
i1_i0 = i5_i4;
q1_q0 = q5_q4;
}
_i1_i0 = i1_i0;
_q1_q0 = q1_q0;
return { dst.p, src.count / 2, src.sampling_rate / 2 };
}
buffer_c16_t TranslateByFSOver4AndDecimateBy2CIC3::execute(const buffer_c8_t& src, const buffer_c16_t& dst) {
/* Translates incoming complex<int8_t> samples by -fs/4,
* decimates by two using a non-recursive third-order CIC filter.
*/
/* Derivation of algorithm:
* Original CIC filter (decimating by two):
* D_I0 = i3 * 1 + i2 * 3 + i1 * 3 + i0 * 1
* D_Q0 = q3 * 1 + q2 * 3 + q1 * 3 + q0 * 1
*
* D_I1 = i5 * 1 + i4 * 3 + i3 * 3 + i2 * 1
* D_Q1 = q5 * 1 + q4 * 3 + q3 * 3 + q2 * 1
*
* Translate -fs/4, phased 180 degrees, accomplished by complex multiplication
* of complex length-4 sequence:
*
* Substitute:
* i0 = -i0, q0 = -q0
* i1 = -q1, q1 = i1
* i2 = i2, q2 = q2
* i3 = q3, q3 = -i3
* i4 = -i4, q4 = -q4
* i5 = -q5, q5 = i5
*
* Resulting taps (with decimation by 2, four samples in, two samples out):
* D_I0 = q3 * 1 + i2 * 3 + -q1 * 3 + -i0 * 1
* D_Q0 = -i3 * 1 + q2 * 3 + i1 * 3 + -q0 * 1
*
* D_I1 = -q5 * 1 + -i4 * 3 + q3 * 3 + i2 * 1
* D_Q1 = i5 * 1 + -q4 * 3 + -i3 * 3 + q2 * 1
*/
// 6 cycles per complex input sample, not including loop overhead.
uint32_t q1_i0 = _q1_i0;
uint32_t q0_i1 = _q0_i1;
/* 3:1 Scaled by 32 to normalize output to +/-32768-ish. */
constexpr uint32_t scale_factor = 32;
const uint32_t k_3_1 = 0x00030001 * scale_factor;
uint32_t* src_p = reinterpret_cast<uint32_t*>(&src.p[0]);
uint32_t* const src_end = reinterpret_cast<uint32_t*>(&src.p[src.count]);
uint32_t* dst_p = reinterpret_cast<uint32_t*>(&dst.p[0]);
while(src_p < src_end) {
const uint32_t q3_i3_q2_i2 = *(src_p++); // 3
const uint32_t q5_i5_q4_i4 = *(src_p++);
const uint32_t i2_i3 = __SXTB16(q3_i3_q2_i2, 16); // 1: (q3_i3_q2_i2 ror 16)[23:16]:(q3_i3_q2_i2 ror 16)[7:0]
const uint32_t q3_q2 = __SXTB16(q3_i3_q2_i2, 8); // 1: (q3_i3_q2_i2 ror 8)[23:16]:(q3_i3_q2_i2 ror 8)[7:0]
const uint32_t i2_q3 = __PKHTB(i2_i3, q3_q2, 16); // 1: Rn[31:16]:(Rm>>16)[15:0]
const uint32_t i3_q2 = __PKHBT(q3_q2, i2_i3, 16); // 1:(Rm<<16)[31:16]:Rn[15:0]
// D_I0 = 3 * (i2 - q1) + (q3 - i0)
const uint32_t i2_m_q1_q3_m_i0 = __QSUB16(i2_q3, q1_i0); // 1: Rn[31:16]-Rm[31:16]:Rn[15:0]-Rm[15:0]
const uint32_t d_i0 = __SMUAD(k_3_1, i2_m_q1_q3_m_i0); // 1: Rm[15:0]*Rs[15:0]+Rm[31:16]*Rs[31:16]
// D_Q0 = 3 * (q2 + i1) - (i3 + q0)
const uint32_t i3_p_q0_q2_p_i1 = __QADD16(i3_q2, q0_i1); // 1: Rn[31:16]+Rm[31:16]:Rn[15:0]+Rm[15:0]
const uint32_t d_q0 = __SMUSDX(i3_p_q0_q2_p_i1, k_3_1); // 1: Rm[15:0]*Rs[31:16]–Rm[31:16]*RsX[15:0]
const uint32_t d_q0_i0 = __PKHBT(d_i0, d_q0, 16); // 1: (Rm<<16)[31:16]:Rn[15:0]
const uint32_t i5_i4 = __SXTB16(q5_i5_q4_i4, 0); // 1: (q5_i5_q4_i4 ror 0)[23:16]:(q5_i5_q4_i4 ror 0)[7:0]
const uint32_t q4_q5 = __SXTB16(q5_i5_q4_i4, 24); // 1: (q5_i5_q4_i4 ror 24)[23:16]:(q5_i5_q4_i4 ror 24)[7:0]
const uint32_t q4_i5 = __PKHTB(q4_q5, i5_i4, 16); // 1: Rn[31:16]:(Rm>>16)[15:0]
const uint32_t q5_i4 = __PKHBT(i5_i4, q4_q5, 16); // 1: (Rm<<16)[31:16]:Rn[15:0]
// D_I1 = (i2 - q5) + 3 * (q3 - i4)
const uint32_t i2_m_q5_q3_m_i4 = __QSUB16(i2_q3, q5_i4); // 1: Rn[31:16]-Rm[31:16]:Rn[15:0]-Rm[15:0]
const uint32_t d_i1 = __SMUADX(i2_m_q5_q3_m_i4, k_3_1); // 1: Rm[15:0]*Rs[31:16]+Rm[31:16]*Rs[15:0]
// D_Q1 = (i5 + q2) - 3 * (q4 + i3)
const uint32_t q4_p_i3_i5_p_q2 = __QADD16(q4_i5, i3_q2); // 1: Rn[31:16]+Rm[31:16]:Rn[15:0]+Rm[15:0]
const uint32_t d_q1 = __SMUSD(k_3_1, q4_p_i3_i5_p_q2); // 1: Rm[15:0]*Rs[15:0]–Rm[31:16]*Rs[31:16]
const uint32_t d_q1_i1 = __PKHBT(d_i1, d_q1, 16); // 1: (Rm<<16)[31:16]:Rn[15:0]
*(dst_p++) = d_q0_i0; // 3
*(dst_p++) = d_q1_i1;
q1_i0 = q5_i4;
q0_i1 = q4_i5;
}
_q1_i0 = q1_i0;
_q0_i1 = q0_i1;
return { dst.p, src.count / 2, src.sampling_rate / 2 };
}
buffer_c16_t DecimateBy2CIC3::execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
) {
/* Complex non-recursive 3rd-order CIC filter (taps 1,3,3,1).
* Gain of 8.
* Consumes 16 bytes (4 s16:s16 samples) per loop iteration,
* Produces 8 bytes (2 s16:s16 samples) per loop iteration.
*/
uint32_t t1 = _iq0;
uint32_t t2 = _iq1;
const uint32_t taps = 0x00000003;
void* s = src.p;
void* d = dst.p;
const auto d_end = &dst.p[src.count / 2];
while(d < d_end) {
uint32_t i = __SXTH(t1, 0); /* 1: I0 */
uint32_t q = __SXTH(t1, 16); /* 1: Q0 */
i = __SMLABB(t2, taps, i); /* 1: I1*3 + I0 */
q = __SMLATB(t2, taps, q); /* 1: Q1*3 + Q0 */
const uint32_t t3 = *__SIMD32(s)++; /* 3: Q2:I2 */
const uint32_t t4 = *__SIMD32(s)++; /* Q3:I3 */
i = __SMLABB(t3, taps, i); /* 1: I2*3 + I1*3 + I0 */
q = __SMLATB(t3, taps, q); /* 1: Q2*3 + Q1*3 + Q0 */
int32_t si0 = __SXTAH(i, t4, 0); /* 1: I3 + Q2*3 + Q1*3 + Q0 */
int32_t sq0 = __SXTAH(q, t4, 16); /* 1: Q3 + Q2*3 + Q1*3 + Q0 */
i = __BFI(si0 / 8, sq0 / 8, 16, 16); /* 1: D2_Q0:D2_I0 */
*__SIMD32(d)++ = i; /* D2_Q0:D2_I0 */
i = __SXTH(t3, 0); /* 1: I2 */
q = __SXTH(t3, 16); /* 1: Q2 */
i = __SMLABB(t4, taps, i); /* 1: I3*3 + I2 */
q = __SMLATB(t4, taps, q); /* 1: Q3*3 + Q2 */
t1 = *__SIMD32(s)++; /* 3: Q4:I4 */
t2 = *__SIMD32(s)++; /* Q5:I5 */
i = __SMLABB(t1, taps, i); /* 1: I4*3 + I3*3 + I2 */
q = __SMLATB(t1, taps, q); /* 1: Q4*3 + Q3*3 + Q2 */
int32_t si1 = __SXTAH(i, t2, 0) ; /* 1: I5 + Q4*3 + Q3*3 + Q2 */
int32_t sq1 = __SXTAH(q, t2, 16); /* 1: Q5 + Q4*3 + Q3*3 + Q2 */
i = __BFI(si1 / 8, sq1 / 8, 16, 16); /* 1: D2_Q1:D2_I1 */
*__SIMD32(d)++ = i; /* D2_Q1:D2_I1 */
}
_iq0 = t1;
_iq1 = t2;
return { dst.p, src.count / 2, src.sampling_rate / 2 };
}
void FIR64AndDecimateBy2Real::configure(
const std::array<int16_t, taps_count>& new_taps
) {
std::copy(new_taps.cbegin(), new_taps.cend(), taps.begin());
}
buffer_s16_t FIR64AndDecimateBy2Real::execute(
const buffer_s16_t& src,
const buffer_s16_t& dst
) {
/* int16_t input (sample count "n" must be multiple of 4)
* -> int16_t output, decimated by 2.
* taps are normalized to 1 << 16 == 1.0.
*/
auto src_p = src.p;
auto dst_p = dst.p;
int32_t n = src.count;
for(; n>0; n-=2) {
z[taps_count-2] = *(src_p++);
z[taps_count-1] = *(src_p++);
int32_t t = 0;
for(size_t j=0; j<taps_count; j+=4) {
t += z[j+0] * taps[j+0];
t += z[j+1] * taps[j+1];
t += z[j+2] * taps[j+2];
t += z[j+3] * taps[j+3];
z[j+0] = z[j+0+2];
z[j+1] = z[j+1+2];
z[j+2] = z[j+2+2];
z[j+3] = z[j+3+2];
}
*(dst_p++) = t / 65536;
}
return { dst.p, src.count / 2, src.sampling_rate / 2 };
}
void FIRAndDecimateComplex::configure_common(
const size_t taps_count, const size_t decimation_factor
) {
samples_ = std::make_unique<samples_t>(taps_count);
taps_reversed_ = std::make_unique<taps_t>(taps_count);
taps_count_ = taps_count;
decimation_factor_ = decimation_factor;
}
buffer_c16_t FIRAndDecimateComplex::execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
) {
/* int16_t input (sample count "n" must be multiple of decimation_factor)
* -> int16_t output, decimated by decimation_factor.
* taps are normalized to 1 << 16 == 1.0.
*/
const auto output_sampling_rate = src.sampling_rate / decimation_factor_;
const size_t output_samples = src.count / decimation_factor_;
void* dst_p = dst.p;
const buffer_c16_t result { dst.p, output_samples, output_sampling_rate };
const void* src_p = src.p;
size_t outer_count = output_samples;
while(outer_count > 0) {
/* Put new samples into delay buffer */
void* z_new_p = &samples_[taps_count_ - decimation_factor_];
for(size_t i=0; i<decimation_factor_; i++) {
*__SIMD32(z_new_p)++ = *__SIMD32(src_p)++;
}
size_t loop_count = taps_count_ / 8;
void* t_p = &taps_reversed_[0];
void* z_p = &samples_[0];
int64_t t_real = 0;
int64_t t_imag = 0;
while(loop_count > 0) {
const auto tap0 = *__SIMD32(t_p)++;
const auto sample0 = *__SIMD32(z_p)++;
const auto tap1 = *__SIMD32(t_p)++;
const auto sample1 = *__SIMD32(z_p)++;
t_real = __SMLSLD(sample0, tap0, t_real);
t_imag = __SMLALDX(sample0, tap0, t_imag);
t_real = __SMLSLD(sample1, tap1, t_real);
t_imag = __SMLALDX(sample1, tap1, t_imag);
const auto tap2 = *__SIMD32(t_p)++;
const auto sample2 = *__SIMD32(z_p)++;
const auto tap3 = *__SIMD32(t_p)++;
const auto sample3 = *__SIMD32(z_p)++;
t_real = __SMLSLD(sample2, tap2, t_real);
t_imag = __SMLALDX(sample2, tap2, t_imag);
t_real = __SMLSLD(sample3, tap3, t_real);
t_imag = __SMLALDX(sample3, tap3, t_imag);
const auto tap4 = *__SIMD32(t_p)++;
const auto sample4 = *__SIMD32(z_p)++;
const auto tap5 = *__SIMD32(t_p)++;
const auto sample5 = *__SIMD32(z_p)++;
t_real = __SMLSLD(sample4, tap4, t_real);
t_imag = __SMLALDX(sample4, tap4, t_imag);
t_real = __SMLSLD(sample5, tap5, t_real);
t_imag = __SMLALDX(sample5, tap5, t_imag);
const auto tap6 = *__SIMD32(t_p)++;
const auto sample6 = *__SIMD32(z_p)++;
const auto tap7 = *__SIMD32(t_p)++;
const auto sample7 = *__SIMD32(z_p)++;
t_real = __SMLSLD(sample6, tap6, t_real);
t_imag = __SMLALDX(sample6, tap6, t_imag);
t_real = __SMLSLD(sample7, tap7, t_real);
t_imag = __SMLALDX(sample7, tap7, t_imag);
loop_count--;
}
/* TODO: Re-evaluate whether saturation is performed, normalization,
* all that jazz.
*/
const int32_t r = t_real >> 16;
const int32_t i = t_imag >> 16;
const int32_t r_sat = __SSAT(r, 16);
const int32_t i_sat = __SSAT(i, 16);
*__SIMD32(dst_p)++ = __PKHBT(
r_sat,
i_sat,
16
);
/* Shift sample buffer left/down by decimation factor. */
const size_t unroll_factor = 4;
size_t shift_count = (taps_count_ - decimation_factor_) / unroll_factor;
void* t = &samples_[0];
const void* s = &samples_[decimation_factor_];
while(shift_count > 0) {
*__SIMD32(t)++ = *__SIMD32(s)++;
*__SIMD32(t)++ = *__SIMD32(s)++;
*__SIMD32(t)++ = *__SIMD32(s)++;
*__SIMD32(t)++ = *__SIMD32(s)++;
shift_count--;
}
shift_count = (taps_count_ - decimation_factor_) % unroll_factor;
while(shift_count > 0) {
*__SIMD32(t)++ = *__SIMD32(s)++;
shift_count--;
}
outer_count--;
}
return result;
}
buffer_s16_t DecimateBy2CIC4Real::execute(
const buffer_s16_t& src,
const buffer_s16_t& dst
) {
auto src_p = src.p;
auto dst_p = dst.p;
int32_t n = src.count;
for(; n>0; n-=2) {
/* TODO: Probably a lot of room to optimize... */
z[0] = z[2];
z[1] = z[3];
z[2] = z[4];
z[3] = *(src_p++);
z[4] = *(src_p++);
int32_t t = z[0] + z[1] * 4 + z[2] * 6 + z[3] * 4 + z[4];
*(dst_p++) = t / 16;
}
return { dst.p, src.count / 2, src.sampling_rate / 2 };
}
} /* namespace decimate */
} /* namespace dsp */

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __DSP_DECIMATE_H__
#define __DSP_DECIMATE_H__
#include <cstdint>
#include <array>
#include <memory>
#include <algorithm>
#include "utility.hpp"
#include "dsp_types.hpp"
#include "simd.hpp"
namespace dsp {
namespace decimate {
class Complex8DecimateBy2CIC3 {
public:
buffer_c16_t execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
);
private:
uint32_t _i1_i0 { 0 };
uint32_t _q1_q0 { 0 };
};
class TranslateByFSOver4AndDecimateBy2CIC3 {
public:
buffer_c16_t execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
);
private:
uint32_t _q1_i0 { 0 };
uint32_t _q0_i1 { 0 };
};
class DecimateBy2CIC3 {
public:
buffer_c16_t execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
);
private:
uint32_t _iq0 { 0 };
uint32_t _iq1 { 0 };
};
class FIR64AndDecimateBy2Real {
public:
static constexpr size_t taps_count = 64;
void configure(
const std::array<int16_t, taps_count>& taps
);
buffer_s16_t execute(
const buffer_s16_t& src,
const buffer_s16_t& dst
);
private:
std::array<int16_t, taps_count + 2> z { };
std::array<int16_t, taps_count> taps { };
};
class FIRC8xR16x24FS4Decim4 {
public:
static constexpr size_t taps_count = 24;
static constexpr size_t decimation_factor = 4;
using sample_t = complex8_t;
using tap_t = int16_t;
enum class Shift : bool {
Down = true,
Up = false
};
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale,
const Shift shift = Shift::Down
);
buffer_c16_t execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_ { };
std::array<tap_t, taps_count> taps_ { };
int32_t output_scale = 0;
};
class FIRC8xR16x24FS4Decim8 {
public:
static constexpr size_t taps_count = 24;
static constexpr size_t decimation_factor = 8;
using sample_t = complex8_t;
using tap_t = int16_t;
enum class Shift : bool {
Down = true,
Up = false
};
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale,
const Shift shift = Shift::Down
);
buffer_c16_t execute(
const buffer_c8_t& src,
const buffer_c16_t& dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_ { };
std::array<tap_t, taps_count> taps_ { };
int32_t output_scale = 0;
};
class FIRC16xR16x16Decim2 {
public:
static constexpr size_t taps_count = 16;
static constexpr size_t decimation_factor = 2;
using sample_t = complex16_t;
using tap_t = int16_t;
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale
);
buffer_c16_t execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_ { };
std::array<tap_t, taps_count> taps_ { };
int32_t output_scale = 0;
};
class FIRC16xR16x32Decim8 {
public:
static constexpr size_t taps_count = 32;
static constexpr size_t decimation_factor = 8;
using sample_t = complex16_t;
using tap_t = int16_t;
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale
);
buffer_c16_t execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_ { };
std::array<tap_t, taps_count> taps_ { };
int32_t output_scale = 0;
};
class FIRAndDecimateComplex {
public:
using sample_t = complex16_t;
using tap_t = complex16_t;
using taps_t = tap_t[];
/* NOTE! Current code makes an assumption that block of samples to be
* processed will be a multiple of the taps_count.
*/
template<typename T>
void configure(
const T& taps,
const size_t decimation_factor
) {
configure(taps.data(), taps.size(), decimation_factor);
}
buffer_c16_t execute(
const buffer_c16_t& src,
const buffer_c16_t& dst
);
private:
using samples_t = sample_t[];
std::unique_ptr<samples_t> samples_ { };
std::unique_ptr<taps_t> taps_reversed_ { };
size_t taps_count_ { 0 };
size_t decimation_factor_ { 1 };
template<typename T>
void configure(
const T* const taps,
const size_t taps_count,
const size_t decimation_factor
) {
configure_common(taps_count, decimation_factor);
std::reverse_copy(&taps[0], &taps[taps_count], &taps_reversed_[0]);
}
void configure_common(
const size_t taps_count,
const size_t decimation_factor
);
};
class DecimateBy2CIC4Real {
public:
buffer_s16_t execute(
const buffer_s16_t& src,
const buffer_s16_t& dst
);
private:
int16_t z[5] { };
int16_t _dummy { }; // TODO: Addresses GCC bug when constructing a class that's not sizeof() % 4 == 0?
};
} /* namespace decimate */
} /* namespace dsp */
#endif/*__DSP_DECIMATE_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "dsp_demodulate.hpp"
#include "complex.hpp"
#include "fxpt_atan2.hpp"
#include "utility_m4.hpp"
#include <hal.h>
namespace dsp {
namespace demodulate {
buffer_f32_t AM::execute(
const buffer_c16_t& src,
const buffer_f32_t& dst
) {
const void* src_p = src.p;
const auto src_end = &src.p[src.count];
auto dst_p = dst.p;
while(src_p < src_end) {
const uint32_t sample0 = *__SIMD32(src_p)++;
const uint32_t sample1 = *__SIMD32(src_p)++;
const uint32_t mag_sq0 = __SMUAD(sample0, sample0);
const uint32_t mag_sq1 = __SMUAD(sample1, sample1);
*(dst_p++) = __builtin_sqrtf(mag_sq0) * k;
*(dst_p++) = __builtin_sqrtf(mag_sq1) * k;
}
return { dst.p, src.count, src.sampling_rate };
}
buffer_f32_t SSB::execute(
const buffer_c16_t& src,
const buffer_f32_t& dst
) {
const complex16_t* src_p = src.p;
const auto src_end = &src.p[src.count];
auto dst_p = dst.p;
while(src_p < src_end) {
*(dst_p++) = (src_p++)->real() * k;
*(dst_p++) = (src_p++)->real() * k;
*(dst_p++) = (src_p++)->real() * k;
*(dst_p++) = (src_p++)->real() * k;
}
return { dst.p, src.count, src.sampling_rate };
}
/*
static inline float angle_approx_4deg0(const complex32_t t) {
const auto x = static_cast<float>(t.imag()) / static_cast<float>(t.real());
return 16384.0f * x;
}
*/
static inline float angle_approx_0deg27(const complex32_t t) {
if( t.real() ) {
const auto x = static_cast<float>(t.imag()) / static_cast<float>(t.real());
return x / (1.0f + 0.28086f * x * x);
} else {
return (t.imag() < 0) ? -1.5707963268f : 1.5707963268f;
}
}
static inline float angle_precise(const complex32_t t) {
return atan2f(t.imag(), t.real());
}
buffer_f32_t FM::execute(
const buffer_c16_t& src,
const buffer_f32_t& dst
) {
auto z = z_;
const void* src_p = src.p;
const auto src_end = &src.p[src.count];
auto dst_p = dst.p;
while(src_p < src_end) {
const auto s0 = *__SIMD32(src_p)++;
const auto s1 = *__SIMD32(src_p)++;
const auto t0 = multiply_conjugate_s16_s32(s0, z);
const auto t1 = multiply_conjugate_s16_s32(s1, s0);
z = s1;
*(dst_p++) = angle_precise(t0) * kf;
*(dst_p++) = angle_precise(t1) * kf;
}
z_ = z;
return { dst.p, src.count, src.sampling_rate };
}
buffer_s16_t FM::execute(
const buffer_c16_t& src,
const buffer_s16_t& dst
) {
auto z = z_;
const void* src_p = src.p;
const auto src_end = &src.p[src.count];
void* dst_p = dst.p;
while(src_p < src_end) {
const auto s0 = *__SIMD32(src_p)++;
const auto s1 = *__SIMD32(src_p)++;
const auto t0 = multiply_conjugate_s16_s32(s0, z);
const auto t1 = multiply_conjugate_s16_s32(s1, s0);
z = s1;
const int32_t theta0_int = angle_approx_0deg27(t0) * ks16;
const int32_t theta0_sat = __SSAT(theta0_int, 16);
const int32_t theta1_int = angle_approx_0deg27(t1) * ks16;
const int32_t theta1_sat = __SSAT(theta1_int, 16);
*__SIMD32(dst_p)++ = __PKHBT(
theta0_sat,
theta1_sat,
16
);
}
z_ = z;
return { dst.p, src.count, src.sampling_rate };
}
void FM::configure(const float sampling_rate, const float deviation_hz) {
/*
* angle: -pi to pi. output range: -32768 to 32767.
* Maximum delta-theta (output of atan2) at maximum deviation frequency:
* delta_theta_max = 2 * pi * deviation / sampling_rate
*/
kf = static_cast<float>(1.0f / (2.0 * pi * deviation_hz / sampling_rate));
ks16 = 32767.0f * kf;
}
}
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __DSP_DEMODULATE_H__
#define __DSP_DEMODULATE_H__
#include "dsp_types.hpp"
namespace dsp {
namespace demodulate {
class AM {
public:
buffer_f32_t execute(
const buffer_c16_t& src,
const buffer_f32_t& dst
);
private:
static constexpr float k = 1.0f / 32768.0f;
};
class SSB {
public:
buffer_f32_t execute(
const buffer_c16_t& src,
const buffer_f32_t& dst
);
private:
static constexpr float k = 1.0f / 32768.0f;
};
class FM {
public:
buffer_f32_t execute(
const buffer_c16_t& src,
const buffer_f32_t& dst
);
buffer_s16_t execute(
const buffer_c16_t& src,
const buffer_s16_t& dst
);
void configure(const float sampling_rate, const float deviation_hz);
private:
complex16_t::rep_type z_ { 0 };
float kf { 0 };
float ks16 { 0 };
};
} /* namespace demodulate */
} /* namespace dsp */
#endif/*__DSP_DEMODULATE_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2018 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "dsp_goertzel.hpp"
#include "complex.hpp"
#include "sine_table.hpp"
namespace dsp {
GoertzelDetector::GoertzelDetector(
const float frequency,
const uint32_t sample_rate
) {
coefficient = 2.0 * sin_f32((2.0 * pi * frequency / sample_rate) - pi / 2.0);
}
float GoertzelDetector::execute(
const buffer_s16_t& src
) {
const size_t count = src.count;
for (size_t i = 0; i < count; i++) {
s[2] = s[1];
s[1] = s[0];
s[0] = src.p[i] + coefficient * s[1] - s[2];
}
const uint32_t sq0 = s[0] * s[0];
const uint32_t sq1 = s[1] * s[1];
float magnitude = __builtin_sqrtf(sq0 + sq1 - s[0] * s[1] * coefficient);
return magnitude;
}
} /* namespace dsp */

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2018 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __DSP_GOERTZEL_H__
#define __DSP_GOERTZEL_H__
#include "dsp_types.hpp"
namespace dsp {
class GoertzelDetector {
public:
GoertzelDetector(const float frequency, const uint32_t sample_rate);
float execute(const buffer_s16_t& src);
private:
float coefficient { };
int16_t s[2] { 0 };
};
} /* namespace dsp */
#endif/*__DSP_GOERTZEL_H__*/

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/*
* Copyright (C) 2020 Belousov Oleg
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "dsp_hilbert.hpp"
#include "dsp_sos_config.hpp"
namespace dsp {
HilbertTransform::HilbertTransform() {
n = 0;
sos_i.configure(half_band_lpf_config);
sos_q.configure(half_band_lpf_config);
}
void HilbertTransform::execute(float in, float &out_i, float &out_q) {
float a = 0, b = 0;
switch (n) {
case 0: a = in; b = 0; break;
case 1: a = 0; b = -in; break;
case 2: a = -in; b = 0; break;
case 3: a = 0; b = in; break;
}
float i = sos_i.execute(a) * 2.0f;
float q = sos_q.execute(b) * 2.0f;
switch (n) {
case 0: out_i = i; out_q = q; break;
case 1: out_i = -q; out_q = i; break;
case 2: out_i = -i; out_q = -q; break;
case 3: out_i = q; out_q = -i; break;
}
n = (n + 1) % 4;
}
} /* namespace dsp */

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/*
* Copyright (C) 2020 Belousov Oleg
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __DSP_HILBERT_H__
#define __DSP_HILBERT_H__
#include "dsp_sos.hpp"
#include "dsp_types.hpp"
namespace dsp {
class HilbertTransform {
public:
HilbertTransform();
void execute(float in, float &out_i, float &out_q);
private:
uint8_t n = 0;
SOSFilter<5> sos_i = {};
SOSFilter<5> sos_q = {};
};
} /* namespace dsp */
#endif/*__DSP_HILBERT_H__*/

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/*
* Copyright (C) 2020 Belousov Oleg
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "dsp_modulate.hpp"
#include "sine_table_int8.hpp"
#include "portapack_shared_memory.hpp"
#include "tonesets.hpp"
namespace dsp {
namespace modulate {
Modulator::~Modulator() {
}
Mode Modulator::get_mode() {
return mode;
}
void Modulator::set_mode(Mode new_mode) {
mode = new_mode;
}
void Modulator::set_over(uint32_t new_over) {
over = new_over;
}
void Modulator::set_gain_vumeter_beep(float new_audio_gain , bool new_play_beep ) {
audio_gain = new_audio_gain ;
play_beep = new_play_beep;
}
int32_t Modulator::apply_beep(int32_t sample_in, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message ) {
if (play_beep) { // We need to add audio beep sample.
if (new_beep_timer) {
new_beep_timer--;
} else {
new_beep_timer = baseband_fs * 0.05; // 50ms
if (new_beep_index == BEEP_TONES_NB) {
configured_in = false;
shared_memory.application_queue.push(new_txprogress_message);
} else {
beep_gen.configure(beep_deltas[new_beep_index], 1.0); // config sequentially the audio beep tone.
new_beep_index++;
}
}
sample_in = beep_gen.process(0); // Get sample of the selected sequence of 6 beep tones , and overwrite audio sample. Mix 0%.
}
return sample_in; // Return audio mic scaled with gain , 8 bit sample or audio beep sample.
}
///
SSB::SSB() : hilbert() {
mode = Mode::LSB;
}
void SSB::execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer,TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider ) {
// No way to activate correctly the roger beep in this option, Maybe not enough M4 CPU power , Let's block roger beep in SSB selection by now .
int32_t sample = 0;
int8_t re = 0, im = 0;
for (size_t counter = 0; counter < buffer.count; counter++) {
if (counter % 128 == 0) {
float i = 0.0, q = 0.0;
sample = audio.p[counter / over] >> 2;
sample *= audio_gain; // Apply GAIN Scale factor to the audio TX modulation.
//switch (mode) {
//case Mode::LSB:
hilbert.execute(sample / 32768.0f, i, q);
//case Mode::USB: hilbert.execute(sample / 32768.0f, q, i);
//default: break;
//}
i *= 256.0f; // Original 64.0f, now x 4 (+12 dB's SSB BB modulation)
q *= 256.0f; // Original 64.0f, now x 4 (+12 dB's SSB BB modulation)
switch (mode) {
case Mode::LSB: re = q; im = i; break;
case Mode::USB: re = i; im = q; break;
default: re = 0; im = 0; break;
}
//re = q;
//im = i;
//break;
}
buffer.p[counter] = { re, im };
// Update vu-meter bar in the LCD screen.
power_acc += (sample < 0) ? -sample : sample; // Power average for UI vu-meter
if (new_power_acc_count) {
new_power_acc_count--;
} else { // power_acc_count = 0
new_power_acc_count = new_divider;
new_level_message.value = power_acc / (new_divider *8); // Why ? . This division is to adj vu-meter sentitivity, to match saturation point to red-muter .
shared_memory.application_queue.push(new_level_message);
power_acc = 0;
}
}
}
///
FM::FM() {
mode = Mode::FM;
}
void FM::set_fm_delta(uint32_t new_delta) {
fm_delta = new_delta;
}
void FM::set_tone_gen_configure(const uint32_t set_delta, const float set_tone_mix_weight) {
tone_gen.configure(set_delta, set_tone_mix_weight);
}
void FM::execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider ) {
int32_t sample = 0;
int8_t re, im;
for (size_t counter = 0; counter < buffer.count; counter++) {
sample = audio.p[counter>>6] >> 8; // sample = audio.p[counter / over] >> 8; (not enough efficient running code, over = 1536000/240000= 64 )
sample *= audio_gain; // Apply GAIN Scale factor to the audio TX modulation.
if (play_beep) {
sample = apply_beep(sample, configured_in, new_beep_index, new_beep_timer, new_txprogress_message ); // Apply beep -if selected - atom ,sample by sample.
} else {
// Update vu-meter bar in the LCD screen.
power_acc += (sample < 0) ? -sample : sample; // Power average for UI vu-meter
if (new_power_acc_count) {
new_power_acc_count--;
} else { // power_acc_count = 0
new_power_acc_count = new_divider;
new_level_message.value = power_acc / (new_divider / 4); // Why ? . This division is to adj vu-meter sentitivity, to match saturation point to red-muter .
shared_memory.application_queue.push(new_level_message);
power_acc = 0;
}
// TODO: pending to optimize CPU running code.
// So far , we can not handle all 3 issues at the same time (vu-meter , CTCSS, beep).
sample = tone_gen.process(sample); // Add selected Key_Tone or CTCSS subtone , atom function() , sample by sample.
}
delta = sample * fm_delta; // Modulate FM
phase += delta;
sphase = phase >> 24;
re = (sine_table_i8[(sphase + 64) & 255]);
im = (sine_table_i8[sphase]);
buffer.p[counter] = { re, im };
}
}
AM::AM() {
mode = Mode::AM;
}
void AM::execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider ) {
int32_t sample = 0;
int8_t re = 0, im = 0;
float q = 0.0;
for (size_t counter = 0; counter < buffer.count; counter++) {
if (counter % 128 == 0) {
sample = audio.p[counter / over] >> 2;
sample *= audio_gain; // Apply GAIN Scale factor to the audio TX modulation.
}
if (play_beep) {
sample = apply_beep(sample, configured_in, new_beep_index, new_beep_timer, new_txprogress_message )<<5; // Apply beep -if selected - atom sample by sample.
} else {
// Update vu-meter bar in the LCD screen.
power_acc += (sample < 0) ? -sample : sample; // Power average for UI vu-meter
if (new_power_acc_count) {
new_power_acc_count--;
} else { // power_acc_count = 0
new_power_acc_count = new_divider;
new_level_message.value = power_acc / (new_divider *8); // Why ?orig / (new_divider / 4); // Why ?
shared_memory.application_queue.push(new_level_message);
power_acc = 0;
}
}
q = sample / 32768.0f;
q *= 256.0f; // Original 64.0f,now x4 (+12 dB's BB_modulation in AM & DSB)
switch (mode) {
case Mode::AM: re = q + 80; im = q + 80; break; // Original DC add +20_DC_level=carrier,now x4 (+12dB's AM carrier)
case Mode::DSB: re = q; im = q; break;
default: break;
}
buffer.p[counter] = { re, im };
}
}
}
}

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/*
* Copyright (C) 2020 Belousov Oleg
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __DSP_MODULATE_H__
#define __DSP_MODULATE_H__
#include "dsp_types.hpp"
#include "dsp_hilbert.hpp"
#include "tone_gen.hpp"
#include "baseband_processor.hpp"
namespace dsp {
namespace modulate {
enum class Mode {
None,
AM,
DSB,
LSB,
USB,
FM
};
///
class Modulator {
public:
virtual void execute(const buffer_s16_t& audio, const buffer_c8_t& buffer,bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider ) = 0;
virtual ~Modulator();
Mode get_mode();
void set_mode(Mode new_mode);
void set_over(uint32_t new_over);
void set_gain_vumeter_beep(float new_audio_gain , bool new_play_beep );
int32_t apply_beep(int32_t sample_in, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message );
float audio_gain { };
bool play_beep { false };
uint32_t power_acc_count { 0 }; // this var it is initialized from Proc_mictx.cpp
uint32_t divider { }; // this var it is initialized from Proc_mictx.cpp
uint64_t power_acc { 0 }; // it is aux Accumulated sum (Absolute sample signal) , initialitzed to zero.
AudioLevelReportMessage level_message { };
private:
static constexpr size_t baseband_fs = 1536000U;
TXProgressMessage txprogress_message { };
ToneGen beep_gen { };
uint32_t beep_index { }, beep_timer { };
protected:
uint32_t over = 1;
Mode mode = Mode::None;
};
///
class SSB : public Modulator {
public:
SSB();
virtual void execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider );
private:
dsp::HilbertTransform hilbert;
};
///
class FM : public Modulator {
public:
FM();
virtual void execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider ) ;
void set_fm_delta(uint32_t new_delta);
void set_tone_gen_configure(const uint32_t delta, const float tone_mix_weight);
///
private:
uint32_t fm_delta { 0 };
uint32_t phase { 0 }, sphase { 0 };
int32_t sample { 0 }, delta { };
ToneGen tone_gen { };
};
class AM : public Modulator {
public:
AM();
virtual void execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider );
};
} /* namespace modulate */
} /* namespace dsp */
#endif/*__DSP_MODULATE_H__*/

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "dsp_squelch.hpp"
#include <cstdint>
#include <array>
bool FMSquelch::execute(const buffer_f32_t& audio) {
if( threshold_squared == 0.0f ) {
return true;
}
// TODO: No hard-coded array size.
std::array<float, N> squelch_energy_buffer;
const buffer_f32_t squelch_energy {
squelch_energy_buffer.data(),
squelch_energy_buffer.size()
};
non_audio_hpf.execute(audio, squelch_energy);
float non_audio_max_squared = 0;
for(const auto sample : squelch_energy_buffer) {
const float sample_squared = sample * sample;
if( sample_squared > non_audio_max_squared ) {
non_audio_max_squared = sample_squared;
}
}
return (non_audio_max_squared < threshold_squared);
}
void FMSquelch::set_threshold(const float new_value) {
threshold_squared = new_value * new_value;
}

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __DSP_SQUELCH_H__
#define __DSP_SQUELCH_H__
#include "buffer.hpp"
#include "dsp_iir.hpp"
#include "dsp_iir_config.hpp"
#include <cstdint>
#include <cstddef>
class FMSquelch {
public:
bool execute(const buffer_f32_t& audio);
void set_threshold(const float new_value);
private:
static constexpr size_t N = 32;
float threshold_squared { 0.0f };
IIRBiquadFilter non_audio_hpf { non_audio_hpf_config };
};
#endif/*__DSP_SQUELCH_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "event_m4.hpp"
#include "portapack_shared_memory.hpp"
#include "message_queue.hpp"
#include "ch.h"
#include "lpc43xx_cpp.hpp"
using namespace lpc43xx;
#include <cstdint>
#include <array>
extern "C" {
CH_IRQ_HANDLER(MAPP_IRQHandler) {
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
EventDispatcher::events_flag_isr(EVT_MASK_BASEBAND);
chSysUnlockFromIsr();
creg::m0apptxevent::clear();
CH_IRQ_EPILOGUE();
}
}
Thread* EventDispatcher::thread_event_loop = nullptr;
EventDispatcher::EventDispatcher(
std::unique_ptr<BasebandProcessor> baseband_processor
) : baseband_processor { std::move(baseband_processor) }
{
}
void EventDispatcher::run() {
thread_event_loop = chThdSelf();
lpc43xx::creg::m0apptxevent::enable();
while(is_running) {
const auto events = wait();
dispatch(events);
}
lpc43xx::creg::m0apptxevent::disable();
}
void EventDispatcher::request_stop() {
is_running = false;
}
eventmask_t EventDispatcher::wait() {
return chEvtWaitAny(ALL_EVENTS);
}
void EventDispatcher::dispatch(const eventmask_t events) {
if( events & EVT_MASK_BASEBAND ) {
handle_baseband_queue();
}
if( events & EVT_MASK_SPECTRUM ) {
handle_spectrum();
}
}
void EventDispatcher::handle_baseband_queue() {
const auto message = shared_memory.baseband_message;
if( message ) {
on_message(message);
}
}
void EventDispatcher::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::Shutdown:
on_message_shutdown(*reinterpret_cast<const ShutdownMessage*>(message));
break;
default:
on_message_default(message);
shared_memory.baseband_message = nullptr;
break;
}
}
void EventDispatcher::on_message_shutdown(const ShutdownMessage&) {
request_stop();
}
void EventDispatcher::on_message_default(const Message* const message) {
baseband_processor->on_message(message);
}
void EventDispatcher::handle_spectrum() {
const UpdateSpectrumMessage message;
baseband_processor->on_message(&message);
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __EVENT_M4_H__
#define __EVENT_M4_H__
#include "event.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "message.hpp"
#include "ch.h"
constexpr auto EVT_MASK_BASEBAND = EVENT_MASK(0);
constexpr auto EVT_MASK_SPECTRUM = EVENT_MASK(1);
class EventDispatcher {
public:
EventDispatcher(std::unique_ptr<BasebandProcessor> baseband_processor);
void run();
void request_stop();
static inline void events_flag(const eventmask_t events) {
chEvtSignal(thread_event_loop, events);
}
static inline void events_flag_isr(const eventmask_t events) {
chEvtSignalI(thread_event_loop, events);
}
private:
static Thread* thread_event_loop;
std::unique_ptr<BasebandProcessor> baseband_processor;
bool is_running = true;
eventmask_t wait();
void dispatch(const eventmask_t events);
void handle_baseband_queue();
void on_message(const Message* const message);
void on_message_shutdown(const ShutdownMessage&);
void on_message_default(const Message* const message);
void handle_spectrum();
};
#endif/*__EVENT_M4_H__*/

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/*
* fxpt_atan2.c
*
* Copyright (C) 2012, Xo Wang
*
* Hacked up to be a bit more ARM-friendly by:
* Copyright (C) 2013 Jared Boone, ShareBrained Technology, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <math.h>
#include <stdint.h>
#include <stdlib.h>
/**
* Convert floating point to Q15 (1.0.15 fixed point) format.
*
* @param d floating-point value within range -1 to (1 - (2**-15)), inclusive
* @return Q15 value representing d; same range
*/
/*
static inline int16_t q15_from_double(const double d) {
return lrint(d * 32768);
}
*/
/**
* Negative absolute value. Used to avoid undefined behavior for most negative
* integer (see C99 standard 7.20.6.1.2 and footnote 265 for the description of
* abs/labs/llabs behavior).
*
* @param i 16-bit signed integer
* @return negative absolute value of i; defined for all values of i
*/
/*
static inline int16_t s16_nabs(const int16_t j) {
#if (((int16_t)-1) >> 1) == ((int16_t)-1)
// signed right shift sign-extends (arithmetic)
const int16_t negSign = ~(j >> 15); // splat sign bit into all 16 and complement
// if j is positive (negSign is -1), xor will invert j and sub will add 1
// otherwise j is unchanged
return (j ^ negSign) - negSign;
#else
return (j < 0 ? j : -j);
#endif
}
*/
/**
* Q15 (1.0.15 fixed point) multiplication. Various common rounding modes are in
* the function definition for reference (and preference).
*
* @param j 16-bit signed integer representing -1 to (1 - (2**-15)), inclusive
* @param k same format as j
* @return product of j and k, in same format
*/
static inline int16_t q15_mul(const int16_t j, const int16_t k) {
const int32_t intermediate = j * k;
#if 0 // don't round
return intermediate >> 15;
#elif 0 // biased rounding
return (intermediate + 0x4000) >> 15;
#else // unbiased rounding
return (intermediate + ((intermediate & 0x7FFF) == 0x4000 ? 0 : 0x4000)) >> 15;
#endif
}
/**
* Q15 (1.0.15 fixed point) division (non-saturating). Be careful when using
* this function, as it does not behave well when the result is out-of-range.
*
* Value is not defined if numerator is greater than or equal to denominator.
*
* @param numer 16-bit signed integer representing -1 to (1 - (2**-15))
* @param denom same format as numer; must be greater than numerator
* @return numer / denom in same format as numer and denom
*/
static inline int16_t q15_div(const int16_t numer, const int16_t denom) {
return (static_cast<int32_t>(numer) << 15) / denom;
}
/**
* 16-bit fixed point four-quadrant arctangent. Given some Cartesian vector
* (x, y), find the angle subtended by the vector and the positive x-axis.
*
* The value returned is in units of 1/65536ths of one turn. This allows the use
* of the full 16-bit unsigned range to represent a turn. e.g. 0x0000 is 0
* radians, 0x8000 is pi radians, and 0xFFFF is (65535 / 32768) * pi radians.
*
* Because the magnitude of the input vector does not change the angle it
* represents, the inputs can be in any signed 16-bit fixed-point format.
*
* @param y y-coordinate in signed 16-bit
* @param x x-coordinate in signed 16-bit
* @return angle in (val / 32768) * pi radian increments from 0x0000 to 0xFFFF
*/
static inline int16_t nabs(const int16_t j) {
//return -abs(x);
return (j < 0 ? j : -j);
}
int16_t fxpt_atan2(const int16_t y, const int16_t x) {
static const int16_t k1 = 2847;
static const int16_t k2 = 11039;
if (x == y) { // x/y or y/x would return -1 since 1 isn't representable
if (y > 0) { // 1/8
return 8192;
} else if (y < 0) { // 5/8
return 40960;
} else { // x = y = 0
return 0;
}
}
const int16_t nabs_y = nabs(y);
const int16_t nabs_x = nabs(x);
if (nabs_x < nabs_y) { // octants 1, 4, 5, 8
const int16_t y_over_x = q15_div(y, x);
const int16_t correction = q15_mul(k1, nabs(y_over_x));
const int16_t unrotated = q15_mul(k2 + correction, y_over_x);
if (x > 0) { // octants 1, 8
return unrotated;
} else { // octants 4, 5
return 32768 + unrotated;
}
} else { // octants 2, 3, 6, 7
const int16_t x_over_y = q15_div(x, y);
const int16_t correction = q15_mul(k1, nabs(x_over_y));
const int16_t unrotated = q15_mul(k2 + correction, x_over_y);
if (y > 0) { // octants 2, 3
return 16384 - unrotated;
} else { // octants 6, 7
return 49152 - unrotated;
}
}
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __FXPT_ATAN2_H__
#define __FXPT_ATAN2_H__
#include <cstdint>
int16_t fxpt_atan2(const int16_t y, const int16_t x);
#endif/*__FXPT_ATAN2_H__*/

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include <cstdint>
#include <cstddef>
#include <vector>
#include <memory>
#include "gpdma.hpp"
namespace lpc43xx {
namespace gpdma {
namespace lli {
enum class ChainType : uint8_t {
Loop = 0,
OneShot = 1,
};
enum class Interrupt : uint8_t {
All = 0,
Last = 1,
};
struct ChainConfig {
ChainType type;
size_t length;
Interrupt interrupt;
};
enum class BurstSize : uint8_t {
Transfer1 = 0,
Transfer4 = 1,
Transfer8 = 2,
Transfer16 = 3,
Transfer32 = 4,
Transfer64 = 5,
Transfer128 = 6,
Transfer256 = 7,
};
enum class TransferWidth : uint8_t {
Byte = 0,
HalfWord = 1,
Word = 2,
};
enum class Increment : uint8_t {
No = 0,
Yes = 1,
};
using PeripheralIndex = uint8_t;
struct Endpoint {
PeripheralIndex peripheral;
BurstSize burst_size;
TransferWidth transfer_size;
Increment increment;
};
struct ChannelConfig {
ChainConfig chain;
FlowControl flow_control;
Endpoint source;
Endpoint destination;
constexpr gpdma::channel::Control control(
const size_t transfer_size,
const bool last
) {
return {
.transfersize = transfer_size,
.sbsize = toUType(source.burst_size),
.dbsize = toUType(destination.burst_size),
.swidth = toUType(source.transfer_size),
.dwidth = toUType(destination.transfer_size),
.s = source_endpoint_type(flow_control),
.d = destination_endpoint_type(flow_control),
.si = toUType(source.increment),
.di = toUType(destination.increment),
.prot1 = 0,
.prot2 = 0,
.prot3 = 0,
.i = ((chain.interrupt == Interrupt::All) || last) ? 1U : 0U,
};
}
constexpr gpdma::channel::Config config() {
return {
.e = 0,
.srcperipheral = source.peripheral,
.destperipheral = destination.peripheral,
.flowcntrl = flow_control,
.ie = 1,
.itc = 1,
.l = 0,
.a = 0,
.h = 0,
};
};
};
constexpr ChannelConfig channel_config_baseband_tx {
{ ChainType::Loop, 4, Interrupt::All },
gpdma::FlowControl::MemoryToPeripheral_DMAControl,
{ 0x00, BurstSize::Transfer1, TransferWidth::Word, Increment::Yes },
{ 0x00, BurstSize::Transfer1, TransferWidth::Word, Increment::No },
};
constexpr ChannelConfig channel_config_baseband_rx {
{ ChainType::Loop, 4, Interrupt::All },
gpdma::FlowControl::PeripheralToMemory_DMAControl,
{ 0x00, BurstSize::Transfer1, TransferWidth::Word, Increment::No },
{ 0x00, BurstSize::Transfer1, TransferWidth::Word, Increment::Yes },
};
constexpr ChannelConfig channel_config_audio_tx {
{ ChainType::Loop, 4, Interrupt::All },
gpdma::FlowControl::MemoryToPeripheral_DMAControl,
{ 0x0a, BurstSize::Transfer32, TransferWidth::Word, Increment::Yes },
{ 0x0a, BurstSize::Transfer32, TransferWidth::Word, Increment::No },
};
constexpr ChannelConfig channel_config_audio_rx {
{ ChainType::Loop, 4, Interrupt::All },
gpdma::FlowControl::PeripheralToMemory_DMAControl,
{ 0x09, BurstSize::Transfer32, TransferWidth::Word, Increment::No },
{ 0x09, BurstSize::Transfer32, TransferWidth::Word, Increment::Yes },
};
constexpr ChannelConfig channel_config_rssi {
{ ChainType::Loop, 4, Interrupt::All },
gpdma::FlowControl::PeripheralToMemory_DMAControl,
{ 0x0e, BurstSize::Transfer1, TransferWidth::Byte, Increment::No },
{ 0x0e, BurstSize::Transfer1, TransferWidth::Word, Increment::Yes },
};
class Chain {
public:
using chain_t = std::vector<gpdma::channel::LLI>;
using chain_p = std::unique_ptr<chain_t>;
Chain(const ChannelConfig& cc) :
chain(std::make_unique<chain_t>(cc.chain.length))
{
set_lli_sequential(cc.chain_type);
set_source_address()...
}
private:
chain_p chain;
void set_source_peripheral(void* const address) {
set_source_address(address, 0);
}
void set_destination_peripheral(void* const address) {
set_destination_address(address, 0);
}
void set_source_address(void* const address, const size_t increment) {
size_t offset = 0;
for(auto& item : *chain) {
item.srcaddr = (uint32_t)address + offset;
offset += increment;
}
}
void set_destination_address(void* const address, const size_t increment) {
size_t offset = 0;
for(auto& item : *chain) {
item.destaddr = (uint32_t)address + offset;
offset += increment;
}
}
void set_control(const gpdma::channel::Control control) {
for(auto& item : *chain) {
item.control = control;
}
}
void set_lli_sequential(ChainType chain_type) {
for(auto& item : *chain) {
item.lli = lli_pointer(&item + 1);
}
if( chain_type == ChainType::Loop ) {
chain[chain->size() - 1].lli = lli_pointer(&chain[0]);
} else {
chain[chain->size() - 1].lli = lli_pointer(nullptr);
}
}
gpdma::channel::LLIPointer lli_pointer(const void* lli) {
return {
.lm = 0,
.r = 0,
.lli = reinterpret_cast<uint32_t>(lli),
};
}
};
} /* namespace lli */
} /* namespace gpdma */
} /* namespace lpc43xx */

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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Copyright (C) 2014 Jared Boone, ShareBrained Technology
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file templates/halconf.h
* @brief HAL configuration header.
* @details HAL configuration file, this file allows to enable or disable the
* various device drivers from your application. You may also use
* this file in order to override the device drivers default settings.
*
* @addtogroup HAL_CONF
* @{
*/
#ifndef _HALCONF_H_
#define _HALCONF_H_
#include "mcuconf.h"
/**
* @brief Enables the TM subsystem.
*/
#if !defined(HAL_USE_TM) || defined(__DOXYGEN__)
#define HAL_USE_TM FALSE
#endif
/**
* @brief Enables the PAL subsystem.
*/
#if !defined(HAL_USE_PAL) || defined(__DOXYGEN__)
#define HAL_USE_PAL FALSE
#endif
/**
* @brief Enables the ADC subsystem.
*/
#if !defined(HAL_USE_ADC) || defined(__DOXYGEN__)
#define HAL_USE_ADC FALSE
#endif
/**
* @brief Enables the CAN subsystem.
*/
#if !defined(HAL_USE_CAN) || defined(__DOXYGEN__)
#define HAL_USE_CAN FALSE
#endif
/**
* @brief Enables the EXT subsystem.
*/
#if !defined(HAL_USE_EXT) || defined(__DOXYGEN__)
#define HAL_USE_EXT FALSE
#endif
/**
* @brief Enables the GPT subsystem.
*/
#if !defined(HAL_USE_GPT) || defined(__DOXYGEN__)
#define HAL_USE_GPT FALSE
#endif
/**
* @brief Enables the I2C subsystem.
*/
#if !defined(HAL_USE_I2C) || defined(__DOXYGEN__)
#define HAL_USE_I2C FALSE
#endif
/**
* @brief Enables the ICU subsystem.
*/
#if !defined(HAL_USE_ICU) || defined(__DOXYGEN__)
#define HAL_USE_ICU FALSE
#endif
/**
* @brief Enables the MAC subsystem.
*/
#if !defined(HAL_USE_MAC) || defined(__DOXYGEN__)
#define HAL_USE_MAC FALSE
#endif
/**
* @brief Enables the MMC_SPI subsystem.
*/
#if !defined(HAL_USE_MMC_SPI) || defined(__DOXYGEN__)
#define HAL_USE_MMC_SPI FALSE
#endif
/**
* @brief Enables the PWM subsystem.
*/
#if !defined(HAL_USE_PWM) || defined(__DOXYGEN__)
#define HAL_USE_PWM FALSE
#endif
/**
* @brief Enables the RTC subsystem.
*/
#if !defined(HAL_USE_RTC) || defined(__DOXYGEN__)
#define HAL_USE_RTC FALSE
#endif
/**
* @brief Enables the SDC subsystem.
*/
#if !defined(HAL_USE_SDC) || defined(__DOXYGEN__)
#define HAL_USE_SDC FALSE
#endif
/**
* @brief Enables the SERIAL subsystem.
*/
#if !defined(HAL_USE_SERIAL) || defined(__DOXYGEN__)
#define HAL_USE_SERIAL FALSE
#endif
/**
* @brief Enables the SERIAL over USB subsystem.
*/
#if !defined(HAL_USE_SERIAL_USB) || defined(__DOXYGEN__)
#define HAL_USE_SERIAL_USB FALSE
#endif
/**
* @brief Enables the SPI subsystem.
*/
#if !defined(HAL_USE_SPI) || defined(__DOXYGEN__)
#define HAL_USE_SPI FALSE
#endif
/**
* @brief Enables the UART subsystem.
*/
#if !defined(HAL_USE_UART) || defined(__DOXYGEN__)
#define HAL_USE_UART FALSE
#endif
/**
* @brief Enables the USB subsystem.
*/
#if !defined(HAL_USE_USB) || defined(__DOXYGEN__)
#define HAL_USE_USB FALSE
#endif
/*===========================================================================*/
/* ADC driver related settings. */
/*===========================================================================*/
/**
* @brief Enables synchronous APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(ADC_USE_WAIT) || defined(__DOXYGEN__)
#define ADC_USE_WAIT TRUE
#endif
/**
* @brief Enables the @p adcAcquireBus() and @p adcReleaseBus() APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(ADC_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define ADC_USE_MUTUAL_EXCLUSION TRUE
#endif
/*===========================================================================*/
/* CAN driver related settings. */
/*===========================================================================*/
/**
* @brief Sleep mode related APIs inclusion switch.
*/
#if !defined(CAN_USE_SLEEP_MODE) || defined(__DOXYGEN__)
#define CAN_USE_SLEEP_MODE TRUE
#endif
/*===========================================================================*/
/* I2C driver related settings. */
/*===========================================================================*/
/**
* @brief Enables the mutual exclusion APIs on the I2C bus.
*/
#if !defined(I2C_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define I2C_USE_MUTUAL_EXCLUSION TRUE
#endif
/*===========================================================================*/
/* MAC driver related settings. */
/*===========================================================================*/
/**
* @brief Enables an event sources for incoming packets.
*/
#if !defined(MAC_USE_ZERO_COPY) || defined(__DOXYGEN__)
#define MAC_USE_ZERO_COPY FALSE
#endif
/**
* @brief Enables an event sources for incoming packets.
*/
#if !defined(MAC_USE_EVENTS) || defined(__DOXYGEN__)
#define MAC_USE_EVENTS TRUE
#endif
/*===========================================================================*/
/* MMC_SPI driver related settings. */
/*===========================================================================*/
/**
* @brief Delays insertions.
* @details If enabled this options inserts delays into the MMC waiting
* routines releasing some extra CPU time for the threads with
* lower priority, this may slow down the driver a bit however.
* This option is recommended also if the SPI driver does not
* use a DMA channel and heavily loads the CPU.
*/
#if !defined(MMC_NICE_WAITING) || defined(__DOXYGEN__)
#define MMC_NICE_WAITING TRUE
#endif
/*===========================================================================*/
/* SDC driver related settings. */
/*===========================================================================*/
/**
* @brief Number of initialization attempts before rejecting the card.
* @note Attempts are performed at 10mS intervals.
*/
#if !defined(SDC_INIT_RETRY) || defined(__DOXYGEN__)
#define SDC_INIT_RETRY 100
#endif
/**
* @brief Include support for MMC cards.
* @note MMC support is not yet implemented so this option must be kept
* at @p FALSE.
*/
#if !defined(SDC_MMC_SUPPORT) || defined(__DOXYGEN__)
#define SDC_MMC_SUPPORT FALSE
#endif
/**
* @brief Delays insertions.
* @details If enabled this options inserts delays into the MMC waiting
* routines releasing some extra CPU time for the threads with
* lower priority, this may slow down the driver a bit however.
*/
#if !defined(SDC_NICE_WAITING) || defined(__DOXYGEN__)
#define SDC_NICE_WAITING FALSE
#endif
/*===========================================================================*/
/* SERIAL driver related settings. */
/*===========================================================================*/
/**
* @brief Default bit rate.
* @details Configuration parameter, this is the baud rate selected for the
* default configuration.
*/
#if !defined(SERIAL_DEFAULT_BITRATE) || defined(__DOXYGEN__)
#define SERIAL_DEFAULT_BITRATE 38400
#endif
/**
* @brief Serial buffers size.
* @details Configuration parameter, you can change the depth of the queue
* buffers depending on the requirements of your application.
* @note The default is 64 bytes for both the transmission and receive
* buffers.
*/
#if !defined(SERIAL_BUFFERS_SIZE) || defined(__DOXYGEN__)
#define SERIAL_BUFFERS_SIZE 16
#endif
/*===========================================================================*/
/* SPI driver related settings. */
/*===========================================================================*/
/**
* @brief Enables synchronous APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(SPI_USE_WAIT) || defined(__DOXYGEN__)
#define SPI_USE_WAIT TRUE
#endif
/**
* @brief Enables the @p spiAcquireBus() and @p spiReleaseBus() APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(SPI_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define SPI_USE_MUTUAL_EXCLUSION TRUE
#endif
#endif /* _HALCONF_H_ */
/** @} */

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __LINEAR_RESAMPLER_H__
#define __LINEAR_RESAMPLER_H__
namespace dsp {
namespace interpolation {
class LinearResampler {
public:
void configure(
const float input_rate,
const float output_rate
) {
phase_increment = calculate_increment(input_rate, output_rate);
}
template<typename InterpolatedSampleHandler>
void operator()(
const float sample,
InterpolatedSampleHandler interpolated_sample_handler
) {
const float sample_delta = sample - last_sample;
while( phase < 1.0f ) {
const float interpolated_value = last_sample + phase * sample_delta;
interpolated_sample_handler(interpolated_value);
phase += phase_increment;
}
last_sample = sample;
phase -= 1.0f;
}
void advance(const float fraction) {
phase += (fraction * phase_increment);
}
private:
float last_sample { 0.0f };
float phase { 0.0f };
float phase_increment { 0.0f };
static constexpr float calculate_increment(const float input_rate, const float output_rate) {
return input_rate / output_rate;
}
};
} /* namespace interpolation */
} /* namespace dsp */
#endif/*__LINEAR_RESAMPLER_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "ch.h"
#include "lpc43xx_cpp.hpp"
#include "portapack_shared_memory.hpp"
#include "portapack_dma.hpp"
#include "gpdma.hpp"
#include "event_m4.hpp"
#include "touch_dma.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "baseband_processor.hpp"
#include "message_queue.hpp"
#include "utility.hpp"
#include "debug.hpp"
#include "audio_dma.hpp"
#include "gcc.hpp"
#include <cstdint>
#include <cstddef>
#include <array>
extern "C" {
void __late_init(void) {
/*
* System initializations.
* - HAL initialization, this also initializes the configured device drivers
* and performs the board-specific initializations.
* - Kernel initialization, the main() function becomes a thread and the
* RTOS is active.
*/
halInit();
/* After this call, scheduler, systick, heap, etc. are available. */
/* By doing chSysInit() here, it runs before C++ constructors, which may
* require the heap.
*/
chSysInit();
}
}
static void init() {
audio::dma::init();
audio::dma::configure();
audio::dma::enable();
LPC_CREG->DMAMUX = portapack::gpdma_mux;
gpdma::controller.enable();
nvicEnableVector(DMA_IRQn, CORTEX_PRIORITY_MASK(LPC_DMA_IRQ_PRIORITY));
touch::dma::init();
touch::dma::allocate();
touch::dma::enable();
}
static void halt() {
port_disable();
while(true) {
port_wait_for_interrupt();
}
}
static void shutdown() {
// TODO: Is this complete?
nvicDisableVector(DMA_IRQn);
chSysDisable();
systick_stop();
ShutdownMessage shutdown_message;
shared_memory.application_queue.push(shutdown_message);
halt();
}
int main(void) {
init();
/* TODO: Ensure DMAs are configured to point at first LLI in chain. */
EventDispatcher event_dispatcher;
event_dispatcher.run();
shutdown();
return 0;
}

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "matched_filter.hpp"
#include <algorithm>
#include <cmath>
#include "utility.hpp"
namespace dsp {
namespace matched_filter {
void MatchedFilter::configure(
const tap_t* const taps,
const size_t taps_count,
const size_t decimation_factor
) {
samples_ = std::make_unique<samples_t>(taps_count);
taps_reversed_ = std::make_unique<taps_t>(taps_count);
taps_count_ = taps_count;
decimation_factor_ = decimation_factor;
output = 0;
std::reverse_copy(&taps[0], &taps[taps_count], &taps_reversed_[0]);
}
bool MatchedFilter::execute_once(
const sample_t input
) {
samples_[taps_count_ - decimation_factor_ + decimation_phase] = input;
advance_decimation_phase();
if( is_new_decimation_cycle() ) {
float sr_tr = 0.0f;
float si_tr = 0.0f;
float si_ti = 0.0f;
float sr_ti = 0.0f;
for(size_t n=0; n<taps_count_; n++) {
const auto sample = samples_[n];
const auto tap = taps_reversed_[n];
sr_tr += sample.real() * tap.real();
si_ti += sample.imag() * tap.imag();
si_tr += sample.imag() * tap.real();
sr_ti += sample.real() * tap.imag();
}
// N: complex multiple of samples and taps (conjugate, tap.i negated).
// P: complex multiply of samples and taps.
const auto r_n = sr_tr + si_ti;
const auto r_p = sr_tr - si_ti;
const auto i_n = si_tr - sr_ti;
const auto i_p = si_tr + sr_ti;
const auto mag_n = std::sqrt(r_n * r_n + i_n * i_n);
const auto mag_p = std::sqrt(r_p * r_p + i_p * i_p);
const auto diff = mag_p - mag_n;
output = diff;
shift_by_decimation_factor();
return true;
} else {
return false;
}
}
void MatchedFilter::shift_by_decimation_factor() {
const sample_t* s = &samples_[decimation_factor_];
sample_t* t = &samples_[0];
const size_t unroll_factor = 4;
size_t shift_count = (taps_count_ - decimation_factor_) / unroll_factor;
while(shift_count > 0) {
*t++ = *s++;
*t++ = *s++;
*t++ = *s++;
*t++ = *s++;
shift_count--;
}
shift_count = (taps_count_ - decimation_factor_) % unroll_factor;
while(shift_count > 0) {
*t++ = *s++;
shift_count--;
}
}
} /* namespace matched_filter */
} /* namespace dsp */

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __MATCHED_FILTER_H__
#define __MATCHED_FILTER_H__
#include <cstddef>
#include <complex>
#include <memory>
namespace dsp {
namespace matched_filter {
// This filter contains "magic" (optimizations) that expect the taps to
// combine a low-pass filter with a complex sinusoid that performs shifting of
// the input signal to 0Hz/DC. This also means that the taps length must be
// a multiple of the complex sinusoid period.
class MatchedFilter {
public:
using sample_t = std::complex<float>;
using tap_t = std::complex<float>;
using taps_t = tap_t[];
template<class T>
MatchedFilter(
const T& taps,
size_t decimation_factor = 1
) {
configure(taps, decimation_factor);
}
template<class T>
void configure(
const T& taps,
size_t decimation_factor
) {
configure(taps.data(), taps.size(), decimation_factor);
}
bool execute_once(const sample_t input);
float get_output() const {
return output;
}
private:
using samples_t = sample_t[];
std::unique_ptr<samples_t> samples_ { };
std::unique_ptr<taps_t> taps_reversed_ { };
size_t taps_count_ { 0 };
size_t decimation_factor_ { 1 };
size_t decimation_phase { 0 };
float output { 0 };
void shift_by_decimation_factor();
void advance_decimation_phase() {
decimation_phase = (decimation_phase + 1) % decimation_factor_;
}
bool is_new_decimation_cycle() const {
return (decimation_phase == 0);
}
void configure(
const tap_t* const taps,
const size_t taps_count,
const size_t decimation_factor
);
};
} /* namespace matched_filter */
} /* namespace dsp */
#endif/*__MATCHED_FILTER_H__*/

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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Copyright (C) 2014 Jared Boone, ShareBrained Technology
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
* LPC43xx drivers configuration.
* The following settings override the default settings present in
* the various device driver implementation headers.
* Note that the settings for each driver only have effect if the whole
* driver is enabled in halconf.h.
*
* IRQ priorities:
* 7...0 Lowest...Highest.
*/
/* NOTE: Beware setting IRQ priorities < "2":
* dbg_check_enter_isr "#SV8 means that probably you have some IRQ set at a
* priority level above the kernel level (level 0 or 1 usually) so it is able
* to preempt the kernel and mess things up.
*/
/*
* DMA driver system settings.
*/
//#define LPC_ADC0_IRQ_PRIORITY 2
#define LPC_DMA_IRQ_PRIORITY 3
//#define LPC_ADC1_IRQ_PRIORITY 4
#define LPC43XX_M0APPTXEVENT_IRQ_PRIORITY 4
/* M4 is initialized by M0, which has already started PLL1 */
#if !defined(LPC43XX_M4_CLK) || defined(__DOXYGEN__)
#define LPC43XX_M4_CLK 200000000
#endif

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Receiver

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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __OOK_HPP__
#define __OOK_HPP__
#include "phase_detector.hpp"
#include "phase_accumulator.hpp"
#include <cstdint>
#include <complex>
#include <algorithm>
#include <cmath>
class OOKSlicerMagSquaredInt {
public:
using symbol_t = bool;
constexpr OOKSlicerMagSquaredInt(
const float samples_per_symbol
) : mag2_threshold_leak_factor {
static_cast<uint32_t>(
factor_sq(-1.0f / (8.0f * samples_per_symbol)) * float(1ULL << 32)
)
}
{
}
symbol_t operator()(const std::complex<int16_t> in) {
const uint32_t real2 = in.real() * in.real();
const uint32_t imag2 = in.imag() * in.imag();
const uint32_t mag2 = real2 + imag2;
const uint32_t mag2_attenuated = mag2 >> 3; // Approximation of (-4.5dB)^2
mag2_threshold = (uint64_t(mag2_threshold) * uint64_t(mag2_threshold_leak_factor)) >> 32;
mag2_threshold = std::max(mag2_threshold, mag2_attenuated);
const bool symbol = (mag2 > mag2_threshold);
return symbol;
}
private:
const uint32_t mag2_threshold_leak_factor;
uint32_t mag2_threshold = 0;
constexpr float factor_sq(float db) {
return std::pow(10.0f, db / (10.0f / 2));
}
};
class OOKClockRecovery {
public:
constexpr OOKClockRecovery(
const float samples_per_symbol
) : symbol_phase_inc_nominal { static_cast<uint32_t>(std::round((1ULL << 32) / samples_per_symbol)) },
symbol_phase_inc_k { static_cast<uint32_t>(std::round(symbol_phase_inc_nominal * (2.0f / 8.0f) / samples_per_symbol)) },
phase_detector { static_cast<size_t>(std::round(samples_per_symbol)) },
phase_accumulator { symbol_phase_inc_nominal }
{
}
template<typename SymbolHandler>
void operator()(const uint32_t slicer_history, SymbolHandler symbol_handler) {
if( phase_accumulator() ) {
const auto detector_result = phase_detector(slicer_history);
phase_accumulator.set_inc(symbol_phase_inc_nominal + detector_result.error * symbol_phase_inc_k);
symbol_handler(detector_result.symbol);
}
}
private:
const uint32_t symbol_phase_inc_nominal;
const uint32_t symbol_phase_inc_k;
PhaseDetectorEarlyLateGate phase_detector;
PhaseAccumulator phase_accumulator;
};
#endif/*__OOK_HPP__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "packet_builder.hpp"

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PACKET_BUILDER_H__
#define __PACKET_BUILDER_H__
#include <cstdint>
#include <cstddef>
#include <bitset>
#include <functional>
#include "bit_pattern.hpp"
#include "baseband_packet.hpp"
struct NeverMatch {
bool operator()(const BitHistory&, const size_t) const {
return false;
}
};
struct FixedLength {
bool operator()(const BitHistory&, const size_t symbols_received) const {
return symbols_received >= length;
}
const size_t length;
};
template<typename PreambleMatcher, typename UnstuffMatcher, typename EndMatcher>
class PacketBuilder {
public:
using PayloadHandlerFunc = std::function<void(const baseband::Packet& packet)>;
PacketBuilder(
const PreambleMatcher preamble_matcher,
const UnstuffMatcher unstuff_matcher,
const EndMatcher end_matcher,
PayloadHandlerFunc payload_handler
) : payload_handler { std::move(payload_handler) },
preamble(preamble_matcher),
unstuff(unstuff_matcher),
end(end_matcher)
{
}
void configure(
const PreambleMatcher preamble_matcher,
const UnstuffMatcher unstuff_matcher
) {
preamble = preamble_matcher;
unstuff = unstuff_matcher;
reset_state();
}
void execute(
const uint_fast8_t symbol
) {
bit_history.add(symbol);
switch(state) {
case State::Preamble:
if( preamble(bit_history, packet.size()) ) {
state = State::Payload;
}
break;
case State::Payload:
if( !unstuff(bit_history, packet.size()) ) {
packet.add(symbol);
}
if( end(bit_history, packet.size()) ) {
// NOTE: This check is to avoid std::function nullptr check, which
// brings in "_ZSt25__throw_bad_function_callv" and a lot of extra code.
// TODO: Make payload_handler known at compile time.
if( payload_handler ) {
packet.set_timestamp(Timestamp::now());
payload_handler(packet);
}
reset_state();
} else {
if( packet_truncated() ) {
reset_state();
}
}
break;
default:
reset_state();
break;
}
}
private:
enum State {
Preamble,
Payload,
};
bool packet_truncated() const {
return packet.size() >= packet.capacity();
}
const PayloadHandlerFunc payload_handler;
BitHistory bit_history { };
PreambleMatcher preamble { };
UnstuffMatcher unstuff { };
EndMatcher end { };
State state { State::Preamble };
baseband::Packet packet { };
void reset_state() {
packet.clear();
state = State::Preamble;
}
};
#endif/*__PACKET_BUILDER_H__*/

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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PHASE_ACCUMULATOR_HPP__
#define __PHASE_ACCUMULATOR_HPP__
#include <cstdint>
class PhaseAccumulator {
public:
constexpr PhaseAccumulator(
const uint32_t phase_inc
) : phase_inc { phase_inc }
{
}
bool operator()() {
const auto last_phase = phase;
phase += phase_inc;
return (phase < last_phase);
}
void set_inc(const uint32_t new_phase_inc) {
phase_inc = new_phase_inc;
}
private:
uint32_t phase { 0 };
uint32_t phase_inc;
};
#endif/*__PHASE_ACCUMULATOR_HPP__*/

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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PHASE_DETECTOR_HPP__
#define __PHASE_DETECTOR_HPP__
#include <cstdint>
#include <cstddef>
#include <cmath>
class PhaseDetectorEarlyLateGate {
public:
using history_t = uint32_t;
using symbol_t = bool;
using error_t = int;
struct result_t {
symbol_t symbol;
error_t error;
};
constexpr PhaseDetectorEarlyLateGate(
const size_t samples_per_symbol
) : sample_threshold { samples_per_symbol / 2 },
late_mask { (1UL << sample_threshold) - 1UL },
early_mask { late_mask << sample_threshold }
{
}
result_t operator()(const history_t symbol_history) const {
static_assert(sizeof(history_t) == sizeof(unsigned long), "popcountl size mismatch");
// history = ...0111, early
// history = ...1110, late
const size_t late_side = __builtin_popcountl(symbol_history & late_mask);
const size_t early_side = __builtin_popcountl(symbol_history & early_mask);
const size_t total_count = late_side + early_side;
const auto lateness = static_cast<int>(late_side) - static_cast<int>(early_side);
const symbol_t symbol = (total_count >= sample_threshold);
const error_t error = symbol ? -lateness : lateness;
return { symbol, error };
}
private:
const size_t sample_threshold;
const history_t late_mask;
const history_t early_mask;
};
#endif/*__PHASE_DETECTOR_HPP__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2018 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_acars.hpp"
#include "portapack_shared_memory.hpp"
#include "dsp_fir_taps.hpp"
#include "event_m4.hpp"
ACARSProcessor::ACARSProcessor() {
decim_0.configure(taps_11k0_decim_0.taps, 33554432);
decim_1.configure(taps_11k0_decim_1.taps, 131072);
packet.clear();
}
void ACARSProcessor::execute(const buffer_c8_t& buffer) {
/* 2.4576MHz, 2048 samples */
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
const auto decimator_out = decim_1_out;
/* 38.4kHz, 32 samples */
feed_channel_stats(decimator_out);
for(size_t i=0; i<decimator_out.count; i++) {
if( mf.execute_once(decimator_out.p[i]) ) {
clock_recovery(mf.get_output());
}
}
}
void ACARSProcessor::consume_symbol(
const float raw_symbol
) {
const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
//const auto decoded_symbol = acars_decode(sliced_symbol);
// DEBUG
packet.add(sliced_symbol);
if (packet.size() == 256) {
payload_handler(packet);
packet.clear();
}
//packet_builder.execute(decoded_symbol);
}
void ACARSProcessor::payload_handler(
const baseband::Packet& packet
) {
const ACARSPacketMessage message { packet };
shared_memory.application_queue.push(message);
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<ACARSProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2018 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_ACARS_H__
#define __PROC_ACARS_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_decimate.hpp"
#include "spectrum_collector.hpp"
#include <cstdint>
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "channel_decimator.hpp"
#include "matched_filter.hpp"
#include "clock_recovery.hpp"
#include "symbol_coding.hpp"
#include "packet_builder.hpp"
#include "baseband_packet.hpp"
#include "message.hpp"
#include <cstdint>
#include <cstddef>
#include <bitset>
// AIS:
// IN: 2457600/8/8 = 38400
// Offset: 2457600/4 = 614400 (614400/8/8 = 9600)
// Deviation: 2400
// Symbol: 9600
// Decimate: 2
// 4 taps, 1 symbol, 1/4 cycle
// TPMS:
// IN: 2457600/4/2 = 307200
// Offset: 2457600/4 = 614400 (614400/4/2 = 76800)
// Deviation: 38400
// Symbol: 19200
// Decimate: 8
// 16 taps, 1 symbol, 2 cycles
// ACARS:
// IN: 2457600/8/8 = 38400
// Offset: 2457600/4 = 614400 (614400/8/8 = 9600)
// Deviation: ???
// Symbol: 2400
// Decimate: 8
// 16 taps, 1 symbol, 2 cycles
// Number of taps: size of one symbol in samples (in/symbol)
// Cycles:
// Translate+rectangular filter
// sample=38.4k, deviation=4800, symbol=2400
// Length: 16 taps, 1 symbol, 2 cycles of sinusoid
// This is actually the same as rect_taps_307k2_38k4_1t_19k2_p
constexpr std::array<std::complex<float>, 16> rect_taps_38k4_4k8_1t_2k4_p { {
{ 6.2500000000e-02f, 0.0000000000e+00f }, { 4.4194173824e-02f, 4.4194173824e-02f },
{ 0.0000000000e+00f, 6.2500000000e-02f }, { -4.4194173824e-02f, 4.4194173824e-02f },
{ -6.2500000000e-02f, 0.0000000000e+00f }, { -4.4194173824e-02f, -4.4194173824e-02f },
{ 0.0000000000e+00f, -6.2500000000e-02f }, { 4.4194173824e-02f, -4.4194173824e-02f },
{ 6.2500000000e-02f, 0.0000000000e+00f }, { 4.4194173824e-02f, 4.4194173824e-02f },
{ 0.0000000000e+00f, 6.2500000000e-02f }, { -4.4194173824e-02f, 4.4194173824e-02f },
{ -6.2500000000e-02f, 0.0000000000e+00f }, { -4.4194173824e-02f, -4.4194173824e-02f },
{ 0.0000000000e+00f, -6.2500000000e-02f }, { 4.4194173824e-02f, -4.4194173824e-02f },
} };
class ACARSProcessor : public BasebandProcessor {
public:
ACARSProcessor();
void execute(const buffer_c8_t& buffer) override;
private:
static constexpr size_t baseband_fs = 2457600;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { }; // Translate already done here !
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::matched_filter::MatchedFilter mf { rect_taps_38k4_4k8_1t_2k4_p, 8 };
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
4800, 2400, { 0.0555f },
[this](const float symbol) { this->consume_symbol(symbol); }
};
symbol_coding::ACARSDecoder acars_decode { };
/*PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder {
{ 0b011010000110100010000000, 24, 1 }, // SYN, SYN, SOH
{ },
{ 128 },
[this](const baseband::Packet& packet) {
this->payload_handler(packet);
}
};*/
baseband::Packet packet { };
void consume_symbol(const float symbol);
void payload_handler(const baseband::Packet& packet);
};
#endif/*__PROC_ACARS_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2017 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_adsbrx.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
#include <cstddef>
using namespace adsb;
void ADSBRXProcessor::execute(const buffer_c8_t& buffer) {
int8_t re, im;
uint32_t mag;
uint32_t c;
uint8_t bit, byte{};
// This is called at 2M/2048 = 977Hz
// One pulse = 500ns = 2 samples
// One bit = 2 pulses = 1us = 4 samples
if (!configured) return;
for (size_t i = 0; i < buffer.count; i++) {
// Compute sample's magnitude
re = (int32_t)buffer.p[i].real(); // make re float and scale it
im = (int32_t)buffer.p[i].imag(); // make re float and scale it
mag = ((uint32_t)(re*re) + (uint32_t)(im*im));
if (decoding) {
// Decode
// 1 bit lasts 2 samples
if (sample_count & 1) {
if (bit_count >= msgLen)
{
const ADSBFrameMessage message(frame, amp);
shared_memory.application_queue.push(message);
decoding = false;
bit = (prev_mag > mag) ? 1 : 0;
}
else
{
//confidence = true;
bit = (prev_mag > mag) ? 1 : 0;
}
byte = bit | (byte << 1);
bit_count++;
// Perform checks at the end of the first byte
if (!(bit_count & 7)) {
// Store the byte
frame.push_byte(byte);
// Check at the end of the first byte of the message
uint8_t df = (byte >> 3);
if ( (bit_count == 8) && !(df & 0x10) ) {
msgLen = 56; // DFs 16 or greater are long 112. DFs 15 or less are short 56.
}
// Abondon all frames that arent DF17 or DF18 extended squitters
if ( (bit_count == 8) && !((df == 17)||(df == 18)) ) {
decoding = false;
bit = (prev_mag > mag) ? 1 : 0;
frame.clear();
}
} // last bit of a byte
} // Second sample of each bit
sample_count++;
}
// Continue looking for preamble even if in a packet
// switch is new preamble id higher magnitude
// Shift the preamble
for (c = 0; c < (ADSB_PREAMBLE_LENGTH ); c++) { shifter[c] = shifter[c + 1]; }
shifter[ADSB_PREAMBLE_LENGTH] = mag;
// First check of relations between the first 10 samples
// representing a valid preamble. We don't even investigate further
// if this simple test is not passed
if (shifter[0] < shifter[1] &&
shifter[1] > shifter[2] &&
shifter[2] < shifter[3] &&
shifter[3] > shifter[4] &&
shifter[4] < shifter[1] &&
shifter[5] < shifter[1] &&
shifter[6] < shifter[1] &&
shifter[7] < shifter[1] &&
shifter[8] > shifter[9] &&
shifter[9] < shifter[10] &&
shifter[10]> shifter[11] )
{
// The samples between the two spikes must be < than the average
// of the high spikes level. We don't test bits too near to
// the high levels as signals can be out of phase so part of the
// energy can be in the near samples
int32_t thisAmp = (shifter[1] + shifter[3] + shifter[8] + shifter[10]);
uint32_t high = thisAmp / 9;
if (
shifter[5] < high &&
shifter[6] < high &&
// Similarly samples in the range 11-13 must be low, as it is the
// space between the preamble and real data. Again we don't test
// bits too near to high levels, see above
shifter[12] < high &&
shifter[13] < high &&
shifter[14] < high )
{
if ((decoding == false) || // New preamble
((decoding == true) && (thisAmp > amp))) // Higher power than existing packet
{
decoding = true;
msgLen = 112;
amp = thisAmp;
sample_count = 0;
bit_count = 0;
frame.clear();
}
} // 4 & 5 low and 11-14 low
} // Check for preamble pattern
// Store mag for next time
prev_mag = mag;
}
}
void ADSBRXProcessor::on_message(const Message* const message) {
if (message->id == Message::ID::ADSBConfigure) {
bit_count = 0;
sample_count = 0;
decoding = false;
configured = true;
}
}
#ifndef _WIN32
int main() {
EventDispatcher event_dispatcher { std::make_unique<ADSBRXProcessor>() };
event_dispatcher.run();
return 0;
}
#endif

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2017 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_ADSBRX_H__
#define __PROC_ADSBRX_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "adsb_frame.hpp"
using namespace adsb;
#define ADSB_PREAMBLE_LENGTH 16
class ADSBRXProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr size_t baseband_fs = 2000000;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
ADSBFrame frame { };
bool configured { false };
uint32_t prev_mag { 0 };
size_t bit_count { 0 }, sample_count { 0 };
size_t msgLen{ 112 };
uint32_t shifter[ADSB_PREAMBLE_LENGTH+1];
bool decoding { };
bool preamble { }, active { };
uint16_t bit_pos { 0 };
uint8_t cur_bit { 0 };
uint32_t sample { 0 };
int32_t re { }, im { };
int32_t amp {0};
};
#endif

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_adsbtx.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void ADSBTXProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 4M/2048 = 1953Hz
// One pulse = 500ns = 2 samples
// One bit = 2 pulses = 1us = 4 samples
// Test this with ./dump1090 --freq 434000000 --gain 20
// Or ./dump1090 --freq 434000000 --gain 20 --interactive --net --net-http-port 8080 --net-beast
if (!configured) return;
for (size_t i = 0; i < buffer.count; i++) {
if (bit_pos >= (240 << 1)) {
configured = false;
cur_bit = 0;
} else {
cur_bit = shared_memory.bb_data.data[bit_pos >> 1];
bit_pos++;
}
if (cur_bit) {
// Crude AM
buffer.p[i] = am_lut[phase & 3];
phase++;
} else {
buffer.p[i] = { 0, 0 };
}
}
}
void ADSBTXProcessor::on_message(const Message* const p) {
const auto message = *reinterpret_cast<const ADSBConfigureMessage*>(p);
if (message.id == Message::ID::ADSBConfigure) {
bit_pos = 0;
phase = 0;
configured = true;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<ADSBTXProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_ADSBTX_H__
#define __PROC_ADSBTX_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
class ADSBTXProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const p) override;
private:
bool configured = false;
BasebandThread baseband_thread { 4000000, this, NORMALPRIO + 20, baseband::Direction::Transmit };
const complex8_t am_lut[4] = {
{ 127, 0 },
{ 0, 127 },
{ -127, 0 },
{ 0, -127 }
};
uint32_t bit_pos { 0 };
uint32_t cur_bit { 0 };
uint32_t phase { 0 };
TXProgressMessage txprogress_message { };
};
#endif

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_afsk.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void AFSKProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 2.28M/2048 = 1113Hz
if (!configured) return;
for (size_t i = 0; i<buffer.count; i++) {
if (sample_count >= afsk_samples_per_bit) {
if (configured) {
cur_word = *word_ptr;
if (!cur_word) {
// End of data
if (repeat_counter < afsk_repeat) {
// Repeat
bit_pos = 0;
word_ptr = (uint16_t*)shared_memory.bb_data.data;
cur_word = *word_ptr;
txprogress_message.done = false;
txprogress_message.progress = repeat_counter + 1;
shared_memory.application_queue.push(txprogress_message);
repeat_counter++;
} else {
// Stop
cur_word = 0;
txprogress_message.done = true;
shared_memory.application_queue.push(txprogress_message);
configured = false;
}
}
}
cur_bit = (cur_word >> (symbol_count - bit_pos)) & 1;
if (bit_pos >= symbol_count) {
bit_pos = 0;
word_ptr++;
} else {
bit_pos++;
}
sample_count = 0;
} else {
sample_count++;
}
if (cur_bit)
tone_phase += afsk_phase_inc_mark;
else
tone_phase += afsk_phase_inc_space;
tone_sample = sine_table_i8[(tone_phase & 0xFF000000U) >> 24];
delta = tone_sample * fm_delta;
phase += delta;
sphase = phase + (64 << 24);
re = (sine_table_i8[(sphase & 0xFF000000U) >> 24]);
im = (sine_table_i8[(phase & 0xFF000000U) >> 24]);
buffer.p[i] = {re, im};
}
}
void AFSKProcessor::on_message(const Message* const msg) {
const auto message = *reinterpret_cast<const AFSKTxConfigureMessage*>(msg);
if (message.id == Message::ID::AFSKTxConfigure) {
if (message.samples_per_bit) {
afsk_samples_per_bit = message.samples_per_bit;
afsk_phase_inc_mark = message.phase_inc_mark * AFSK_DELTA_COEF;
afsk_phase_inc_space = message.phase_inc_space * AFSK_DELTA_COEF;
afsk_repeat = message.repeat - 1;
fm_delta = message.fm_delta * (0xFFFFFFULL / AFSK_SAMPLERATE);
symbol_count = message.symbol_count - 1;
sample_count = afsk_samples_per_bit;
repeat_counter = 0;
bit_pos = 0;
word_ptr = (uint16_t*)shared_memory.bb_data.data;
cur_word = 0;
cur_bit = 0;
configured = true;
} else
configured = false; // Kill
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<AFSKProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_AFSK_H__
#define __PROC_AFSK_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#define AFSK_SAMPLERATE 1536000
#define AFSK_DELTA_COEF ((1ULL << 32) / AFSK_SAMPLERATE)
class AFSKProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const msg) override;
private:
bool configured = false;
BasebandThread baseband_thread { AFSK_SAMPLERATE, this, NORMALPRIO + 20, baseband::Direction::Transmit };
uint32_t afsk_samples_per_bit { 0 };
uint32_t afsk_phase_inc_mark { 0 };
uint32_t afsk_phase_inc_space { 0 };
uint8_t afsk_repeat { 0 };
uint32_t fm_delta { 0 };
uint8_t symbol_count { 0 };
uint8_t repeat_counter { 0 };
uint8_t bit_pos { 0 };
uint16_t * word_ptr { };
uint16_t cur_word { 0 };
uint8_t cur_bit { 0 };
uint32_t sample_count { 0 };
uint32_t tone_phase { 0 }, phase { 0 }, sphase { 0 };
int32_t tone_sample { 0 }, delta { 0 };
int8_t re { 0 }, im { 0 };
TXProgressMessage txprogress_message { };
};
#endif

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_afskrx.hpp"
#include "portapack_shared_memory.hpp"
#include "event_m4.hpp"
void AFSKRxProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 3072000 / 2048 = 1500Hz
if (!configured) return;
// FM demodulation
const auto decim_0_out = decim_0.execute(buffer, dst_buffer); // 2048 / 8 = 256 (512 I/Q samples)
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer); // 256 / 8 = 32 (64 I/Q samples)
const auto channel_out = channel_filter.execute(decim_1_out, dst_buffer); // 32 / 2 = 16 (32 I/Q samples)
feed_channel_stats(channel_out);
auto audio = demod.execute(channel_out, audio_buffer);
audio_output.write(audio);
// Audio signal processing
for (size_t c = 0; c < audio.count; c++) {
const int32_t sample_int = audio.p[c] * 32768.0f;
int32_t current_sample = __SSAT(sample_int, 16);
current_sample /= 128;
// Delay line put
delay_line[delay_line_index & 0x3F] = current_sample;
// Delay line get, and LPF
sample_mixed = (delay_line[(delay_line_index - (samples_per_bit/2)) & 0x3F] * current_sample) / 4;
sample_filtered = prev_mixed + sample_mixed + (prev_filtered / 2);
delay_line_index++;
prev_filtered = sample_filtered;
prev_mixed = sample_mixed;
// Slice
sample_bits <<= 1;
sample_bits |= (sample_filtered < -20) ? 1 : 0;
// Check for "clean" transition: either 0011 or 1100
if ((((sample_bits >> 2) ^ sample_bits) & 3) == 3) {
// Adjust phase
if (phase < 0x8000)
phase += 0x800; // Is this a proper value ?
else
phase -= 0x800;
}
phase += phase_inc;
if (phase >= 0x10000) {
phase &= 0xFFFF;
if (trigger_word) {
// Continuous-stream value-triggered mode (AX.25) - UNTESTED
word_bits <<= 1;
word_bits |= (sample_bits & 1);
bit_counter++;
if (triggered) {
if (bit_counter == word_length) {
bit_counter = 0;
data_message.is_data = true;
data_message.value = word_bits & word_mask;
shared_memory.application_queue.push(data_message);
}
} else {
if ((word_bits & word_mask) == trigger_value) {
triggered = !triggered;
bit_counter = 0;
data_message.is_data = true;
data_message.value = trigger_value;
shared_memory.application_queue.push(data_message);
}
}
} else {
// RS232-like modem mode
if (state == WAIT_START) {
if (!(sample_bits & 1)) {
// Got start bit
state = RECEIVE;
bit_counter = 0;
}
} else if (state == WAIT_STOP) {
if (sample_bits & 1) {
// Got stop bit
state = WAIT_START;
}
} else {
word_bits <<= 1;
word_bits |= (sample_bits & 1);
bit_counter++;
}
if (bit_counter == word_length) {
bit_counter = 0;
state = WAIT_STOP;
data_message.is_data = true;
data_message.value = word_bits;
shared_memory.application_queue.push(data_message);
}
}
}
}
}
void AFSKRxProcessor::on_message(const Message* const message) {
if (message->id == Message::ID::AFSKRxConfigure)
configure(*reinterpret_cast<const AFSKRxConfigureMessage*>(message));
}
void AFSKRxProcessor::configure(const AFSKRxConfigureMessage& message) {
/*constexpr size_t decim_0_input_fs = baseband_fs;
constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;
constexpr size_t decim_1_input_fs = decim_0_output_fs;
constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
constexpr size_t channel_filter_input_fs = decim_1_output_fs;
const size_t channel_filter_output_fs = channel_filter_input_fs / 2;
const size_t demod_input_fs = channel_filter_output_fs;*/
decim_0.configure(taps_11k0_decim_0.taps, 33554432);
decim_1.configure(taps_11k0_decim_1.taps, 131072);
channel_filter.configure(taps_11k0_channel.taps, 2);
demod.configure(audio_fs, 5000);
audio_output.configure(audio_24k_hpf_300hz_config, audio_24k_deemph_300_6_config, 0);
samples_per_bit = audio_fs / message.baudrate;
phase_inc = (0x10000 * message.baudrate) / audio_fs;
phase = 0;
trigger_word = message.trigger_word;
word_length = message.word_length;
trigger_value = message.trigger_value;
word_mask = (1 << word_length) - 1;
// Delay line
delay_line_index = 0;
triggered = false;
state = WAIT_START;
configured = true;
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<AFSKRxProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_AFSKRX_H__
#define __PROC_AFSKRX_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "audio_output.hpp"
#include "fifo.hpp"
#include "message.hpp"
class AFSKRxProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr size_t baseband_fs = 3072000;
static constexpr size_t audio_fs = baseband_fs / 8 / 8 / 2;
size_t samples_per_bit { };
enum State {
WAIT_START = 0,
WAIT_STOP,
RECEIVE
};
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
std::array<float, 32> audio { };
const buffer_f32_t audio_buffer {
audio.data(),
audio.size()
};
// Array size ok down to 375 bauds (24000 / 375)
std::array<int32_t, 64> delay_line { 0 };
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::decimate::FIRAndDecimateComplex channel_filter { };
dsp::demodulate::FM demod { };
AudioOutput audio_output { };
State state { };
size_t delay_line_index { };
uint32_t bit_counter { 0 };
uint32_t word_bits { 0 };
uint32_t sample_bits { 0 };
uint32_t phase { }, phase_inc { };
int32_t sample_mixed { }, prev_mixed { }, sample_filtered { }, prev_filtered { };
uint32_t word_length { };
uint32_t word_mask { };
uint32_t trigger_value { };
bool configured { false };
bool wait_start { };
bool bit_value { };
bool trigger_word { };
bool triggered { };
void configure(const AFSKRxConfigureMessage& message);
AFSKDataMessage data_message { false, 0 };
};
#endif/*__PROC_TPMS_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_ais.hpp"
#include "portapack_shared_memory.hpp"
#include "dsp_fir_taps.hpp"
#include "event_m4.hpp"
AISProcessor::AISProcessor() {
decim_0.configure(taps_11k0_decim_0.taps, 33554432);
decim_1.configure(taps_11k0_decim_1.taps, 131072);
}
void AISProcessor::execute(const buffer_c8_t& buffer) {
/* 2.4576MHz, 2048 samples */
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
const auto decimator_out = decim_1_out;
/* 38.4kHz, 32 samples */
feed_channel_stats(decimator_out);
for(size_t i=0; i<decimator_out.count; i++) {
if( mf.execute_once(decimator_out.p[i]) ) {
clock_recovery(mf.get_output());
}
}
}
void AISProcessor::consume_symbol(
const float raw_symbol
) {
const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
const auto decoded_symbol = nrzi_decode(sliced_symbol);
packet_builder.execute(decoded_symbol);
}
void AISProcessor::payload_handler(
const baseband::Packet& packet
) {
const AISPacketMessage message { packet };
shared_memory.application_queue.push(message);
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<AISProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_AIS_H__
#define __PROC_AIS_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "channel_decimator.hpp"
#include "matched_filter.hpp"
#include "clock_recovery.hpp"
#include "symbol_coding.hpp"
#include "packet_builder.hpp"
#include "baseband_packet.hpp"
#include "message.hpp"
#include <cstdint>
#include <cstddef>
#include <bitset>
#include "ais_baseband.hpp"
class AISProcessor : public BasebandProcessor {
public:
AISProcessor();
void execute(const buffer_c8_t& buffer) override;
private:
static constexpr size_t baseband_fs = 2457600;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::matched_filter::MatchedFilter mf { baseband::ais::square_taps_38k4_1t_p, 2 };
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
19200, 9600, { 0.0555f },
[this](const float symbol) { this->consume_symbol(symbol); }
};
symbol_coding::NRZIDecoder nrzi_decode { };
PacketBuilder<BitPattern, BitPattern, BitPattern> packet_builder {
{ 0b0101010101111110, 16, 1 },
{ 0b111110, 6 },
{ 0b01111110, 8 },
[this](const baseband::Packet& packet) {
this->payload_handler(packet);
}
};
void consume_symbol(const float symbol);
void payload_handler(const baseband::Packet& packet);
};
#endif/*__PROC_AIS_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_am_audio.hpp"
#include "audio_output.hpp"
#include "event_m4.hpp"
#include <array>
void NarrowbandAMAudio::execute(const buffer_c8_t& buffer) {
if( !configured ) {
return;
}
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
channel_spectrum.feed(decim_1_out, channel_filter_low_f, channel_filter_high_f, channel_filter_transition);
const auto decim_2_out = decim_2.execute(decim_1_out, dst_buffer);
const auto channel_out = channel_filter.execute(decim_2_out, dst_buffer);
// TODO: Feed channel_stats post-decimation data?
feed_channel_stats(channel_out);
auto audio = demodulate(channel_out);
audio_compressor.execute_in_place(audio);
audio_output.write(audio);
}
buffer_f32_t NarrowbandAMAudio::demodulate(const buffer_c16_t& channel) {
if( modulation_ssb ) {
return demod_ssb.execute(channel, audio_buffer);
} else {
return demod_am.execute(channel, audio_buffer);
}
}
void NarrowbandAMAudio::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::UpdateSpectrum:
case Message::ID::SpectrumStreamingConfig:
channel_spectrum.on_message(message);
break;
case Message::ID::AMConfigure:
configure(*reinterpret_cast<const AMConfigureMessage*>(message));
break;
case Message::ID::CaptureConfig:
capture_config(*reinterpret_cast<const CaptureConfigMessage*>(message));
break;
default:
break;
}
}
void NarrowbandAMAudio::configure(const AMConfigureMessage& message) {
constexpr size_t decim_0_input_fs = baseband_fs;
constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;
constexpr size_t decim_1_input_fs = decim_0_output_fs;
constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
constexpr size_t decim_2_input_fs = decim_1_output_fs;
constexpr size_t decim_2_output_fs = decim_2_input_fs / decim_2_decimation_factor;
constexpr size_t channel_filter_input_fs = decim_2_output_fs;
//const size_t channel_filter_output_fs = channel_filter_input_fs / channel_filter_decimation_factor;
decim_0.configure(message.decim_0_filter.taps, 33554432);
decim_1.configure(message.decim_1_filter.taps, 131072);
decim_2.configure(message.decim_2_filter.taps, decim_2_decimation_factor);
channel_filter.configure(message.channel_filter.taps, channel_filter_decimation_factor);
channel_filter_low_f = message.channel_filter.low_frequency_normalized * channel_filter_input_fs;
channel_filter_high_f = message.channel_filter.high_frequency_normalized * channel_filter_input_fs;
channel_filter_transition = message.channel_filter.transition_normalized * channel_filter_input_fs;
channel_spectrum.set_decimation_factor(1.0f);
modulation_ssb = (message.modulation == AMConfigureMessage::Modulation::SSB);
audio_output.configure(message.audio_hpf_config);
configured = true;
}
void NarrowbandAMAudio::capture_config(const CaptureConfigMessage& message) {
if( message.config ) {
audio_output.set_stream(std::make_unique<StreamInput>(message.config));
} else {
audio_output.set_stream(nullptr);
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<NarrowbandAMAudio>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_AM_AUDIO_H__
#define __PROC_AM_AUDIO_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "audio_compressor.hpp"
#include "audio_output.hpp"
#include "spectrum_collector.hpp"
#include <cstdint>
class NarrowbandAMAudio : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr size_t baseband_fs = 3072000;
static constexpr size_t decim_2_decimation_factor = 4;
static constexpr size_t channel_filter_decimation_factor = 1;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
std::array<float, 32> audio { };
const buffer_f32_t audio_buffer {
audio.data(),
audio.size()
};
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::decimate::FIRAndDecimateComplex decim_2 { };
dsp::decimate::FIRAndDecimateComplex channel_filter { };
int32_t channel_filter_low_f = 0;
int32_t channel_filter_high_f = 0;
int32_t channel_filter_transition = 0;
bool modulation_ssb = false;
dsp::demodulate::AM demod_am { };
dsp::demodulate::SSB demod_ssb { };
FeedForwardCompressor audio_compressor { };
AudioOutput audio_output { };
SpectrumCollector channel_spectrum { };
bool configured { false };
void configure(const AMConfigureMessage& message);
void capture_config(const CaptureConfigMessage& message);
buffer_f32_t demodulate(const buffer_c16_t& channel);
};
#endif/*__PROC_AM_AUDIO_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
* Copyright (C) 2020 Shao
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_am_tv.hpp"
#include "portapack_shared_memory.hpp"
#include "dsp_fft.hpp"
#include "event_m4.hpp"
#include <cstdint>
void WidebandFMAudio::execute(const buffer_c8_t& buffer) {
if( !configured ) {
return;
}
std::fill(spectrum.begin(), spectrum.end(), 0);
for(size_t i=0; i<spectrum.size(); i++) {
spectrum[i] += buffer.p[i];
}
const buffer_c16_t buffer_c16 {spectrum.data(),spectrum.size(),buffer.sampling_rate};
channel_spectrum.feed(buffer_c16);
int8_t re ;
//int8_t im;
//int8_t mag;
for (size_t i = 0; i < 128; i++)
{
re = buffer.p[i].real();
//im = buffer.p[i].imag();
//mag = __builtin_sqrtf((re * re) + (im * im)) ;
const unsigned int v = re + 127.0f; //timescope
audio_spectrum.db[i] = std::max(0U, std::min(255U, v));
}
AudioSpectrumMessage message { &audio_spectrum };
shared_memory.application_queue.push(message);
}
void WidebandFMAudio::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::UpdateSpectrum:
case Message::ID::SpectrumStreamingConfig:
channel_spectrum.on_message(message);
break;
case Message::ID::WFMConfigure:
configure(*reinterpret_cast<const WFMConfigureMessage*>(message));
break;
default:
break;
}
}
void WidebandFMAudio::configure(const WFMConfigureMessage& message) {
(void)message; // avoid warning
configured = true;
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<WidebandFMAudio>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
* Copyright (C) 2020 Shao
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_AM_TV_H__
#define __PROC_AM_TV_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_types.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "block_decimator.hpp"
#include "tv_collector.hpp"
class WidebandFMAudio : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr size_t baseband_fs = 2000000;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
AudioSpectrum audio_spectrum { };
TvCollector channel_spectrum { };
std::array<complex16_t, 256> spectrum { };
bool configured { false };
void configure(const WFMConfigureMessage& message);
};
#endif/*__PROC_AM_TV_H__*/

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_aprsrx.hpp"
#include "portapack_shared_memory.hpp"
#include "event_m4.hpp"
#include "stdio.h"
void APRSRxProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 3072000 / 2048 = 1500Hz
if (!configured) return;
// FM demodulation
const auto decim_0_out = decim_0.execute(buffer, dst_buffer); // 2048 / 8 = 256 (512 I/Q samples)
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer); // 256 / 8 = 32 (64 I/Q samples)
const auto channel_out = channel_filter.execute(decim_1_out, dst_buffer); // 32 / 2 = 16 (32 I/Q samples)
feed_channel_stats(channel_out);
auto audio = demod.execute(channel_out, audio_buffer);
audio_output.write(audio);
// Audio signal processing
for (size_t c = 0; c < audio.count; c++) {
const int32_t sample_int = audio.p[c] * 32768.0f;
int32_t current_sample = __SSAT(sample_int, 16);
current_sample /= 128;
// Delay line put
delay_line[delay_line_index & 0x3F] = current_sample;
// Delay line get, and LPF
sample_mixed = (delay_line[(delay_line_index - (samples_per_bit/2)) & 0x3F] * current_sample) / 4;
sample_filtered = prev_mixed + sample_mixed + (prev_filtered / 2);
delay_line_index++;
prev_filtered = sample_filtered;
prev_mixed = sample_mixed;
// Slice
sample_bits <<= 1;
uint8_t bit = (sample_filtered < -20) ? 1 : 0;
sample_bits |= bit;
/*
int16_t scaled = bit == 1 ? 32767 : -32767;
if( stream ) {
const size_t bytes_to_write = sizeof(scaled) * 1;
const auto result = stream->write(&scaled, bytes_to_write);
}
*/
// Check for "clean" transition: either 0011 or 1100
if ((((sample_bits >> 2) ^ sample_bits) & 3) == 3) {
// Adjust phase
if (phase < 0x8000)
phase += 0x800; // Is this a proper value ?
else
phase -= 0x800;
}
phase += phase_inc;
if (phase >= 0x10000) {
phase &= 0xFFFF;
if (true) {
uint8_t bit;
if(__builtin_popcount(sample_bits & 0xFF) >= 0x05){
bit = 0x1;
}
else {
bit = 0x0;
}
if(parse_bit(bit)){
parse_packet();
}
}
}
}
}
void APRSRxProcessor::parse_packet(){
//validate crc
if(packet_buffer_size >= aprs::APRS_MIN_LENGTH){
uint16_t crc = 0xFFFF;
for(size_t i = 0; i < packet_buffer_size; i++){
uint8_t byte = packet_buffer[i];
crc = ((crc >> 8) ^ crc_ccitt_tab[(crc ^ byte) & 0xFF]) & 0xFFFF;
}
if(crc == 0xF0B8){
parse_ax25();
}
}
}
void APRSRxProcessor::parse_ax25(){
aprs_packet.clear();
aprs_packet.set_valid_checksum(true);
for(size_t i = 0; i < packet_buffer_size; i++){
aprs_packet.set(i, packet_buffer[i]);
}
APRSPacketMessage packet_message { aprs_packet };
shared_memory.application_queue.push(packet_message);
}
bool APRSRxProcessor::parse_bit(const uint8_t current_bit){
uint8_t decoded_bit = ~(current_bit ^ last_bit) & 0x1;
last_bit = current_bit;
//int16_t log = decoded_bit == 0 ? -32768 : 32767;
//if(stream){
// const size_t bytes_to_write = sizeof(log) * 1;
// const auto result = stream->write(&log, bytes_to_write);
//}
if(decoded_bit & 0x1){
if(ones_count < 8){
ones_count++;
}
}
else {
if(ones_count > 6){ //not valid
state = WAIT_FLAG;
current_byte = 0;
ones_count = 0;
byte_index = 0;
packet_buffer_size = 0;
return false;
}
else if(ones_count == 6){ //flag
bool done = false;
if(state == IN_FRAME){
done = true;
}
else {
packet_buffer_size = 0;
}
state = WAIT_FRAME;
current_byte = 0;
ones_count = 0;
byte_index = 0;
return done;
}
else if(ones_count == 5){ //bit stuff
ones_count = 0;
return false;
}
else {
ones_count = 0;
}
}
//store
current_byte = current_byte >> 1;
current_byte |= (decoded_bit == 0x1 ? 0x80 : 0x0);
byte_index++;
if(byte_index >= 8){
byte_index = 0;
if(state == WAIT_FRAME){
state = IN_FRAME;
}
if(state == IN_FRAME){
if(packet_buffer_size + 1 >= 256){
state = WAIT_FLAG;
current_byte = 0;
ones_count = 0;
byte_index = 0;
packet_buffer_size = 0;
return false;
}
packet_buffer[packet_buffer_size++] = current_byte;
}
}
return false;
}
void APRSRxProcessor::on_message(const Message* const message) {
if (message->id == Message::ID::APRSRxConfigure)
configure(*reinterpret_cast<const APRSRxConfigureMessage*>(message));
if(message->id == Message::ID::CaptureConfig)
capture_config(*reinterpret_cast<const CaptureConfigMessage*>(message));
}
void APRSRxProcessor::capture_config(const CaptureConfigMessage& message) {
if( message.config ) {
//stream = std::make_unique<StreamInput>(message.config);
audio_output.set_stream(std::make_unique<StreamInput>(message.config));
} else {
//stream.reset();
audio_output.set_stream(nullptr);
}
}
void APRSRxProcessor::configure(const APRSRxConfigureMessage& message) {
decim_0.configure(taps_11k0_decim_0.taps, 33554432);
decim_1.configure(taps_11k0_decim_1.taps, 131072);
channel_filter.configure(taps_11k0_channel.taps, 2);
demod.configure(audio_fs, 5000);
audio_output.configure(audio_24k_hpf_300hz_config, audio_24k_deemph_300_6_config, 0);
samples_per_bit = audio_fs / message.baudrate;
phase_inc = (0x10000 * message.baudrate) / audio_fs;
phase = 0;
// Delay line
delay_line_index = 0;
state = WAIT_FLAG;
configured = true;
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<APRSRxProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_APRSRX_H__
#define __PROC_APRSRX_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "stream_input.hpp"
#include "audio_output.hpp"
#include "fifo.hpp"
#include "message.hpp"
#include "aprs_packet.hpp"
static uint16_t crc_ccitt_tab[256] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
class APRSRxProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr size_t baseband_fs = 3072000;
static constexpr size_t audio_fs = baseband_fs / 8 / 8 / 2;
size_t samples_per_bit { };
enum State {
WAIT_FLAG,
WAIT_FRAME,
IN_FRAME
};
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
std::array<float, 32> audio { };
const buffer_f32_t audio_buffer {
audio.data(),
audio.size()
};
// Array size ok down to 375 bauds (24000 / 375)
std::array<int32_t, 64> delay_line { 0 };
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::decimate::FIRAndDecimateComplex channel_filter { };
std::unique_ptr<StreamInput> stream { };
dsp::demodulate::FM demod { };
AudioOutput audio_output { };
State state { };
size_t delay_line_index { };
uint32_t bit_counter { 0 };
uint32_t word_bits { 0 };
uint32_t sample_bits { 0 };
uint32_t phase { }, phase_inc { };
int32_t sample_mixed { }, prev_mixed { }, sample_filtered { }, prev_filtered { };
uint8_t last_bit = 0;
uint8_t ones_count = 0 ;
uint8_t current_byte = 0;
uint8_t byte_index = 0;
uint8_t packet_buffer[256];
size_t packet_buffer_size = 0;
bool configured { false };
bool wait_start { 0 };
bool bit_value { 0 };
aprs::APRSPacket aprs_packet { };
void configure(const APRSRxConfigureMessage& message);
void capture_config(const CaptureConfigMessage& message);
void parse_packet();
bool parse_bit(const uint8_t bit);
void parse_ax25();
};
#endif/*__PROC_TPMS_H__*/

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_audiotx.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void AudioTXProcessor::execute(const buffer_c8_t& buffer){
if (!configured) return;
// Zero-order hold (poop)
for (size_t i = 0; i < buffer.count; i++) {
resample_acc += resample_inc;
if (resample_acc >= 0x10000) {
resample_acc -= 0x10000;
if (stream) {
stream->read(&audio_sample, 1);
bytes_read++;
}
}
sample = tone_gen.process(audio_sample - 0x80);
// FM
delta = sample * fm_delta;
phase += delta;
sphase = phase + (64 << 24);
re = sine_table_i8[(sphase & 0xFF000000U) >> 24];
im = sine_table_i8[(phase & 0xFF000000U) >> 24];
buffer.p[i] = { (int8_t)re, (int8_t)im };
}
progress_samples += buffer.count;
if (progress_samples >= progress_interval_samples) {
progress_samples -= progress_interval_samples;
txprogress_message.progress = bytes_read; // Inform UI about progress
txprogress_message.done = false;
shared_memory.application_queue.push(txprogress_message);
}
}
void AudioTXProcessor::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::AudioTXConfig:
audio_config(*reinterpret_cast<const AudioTXConfigMessage*>(message));
break;
case Message::ID::ReplayConfig:
configured = false;
bytes_read = 0;
replay_config(*reinterpret_cast<const ReplayConfigMessage*>(message));
break;
case Message::ID::SamplerateConfig:
samplerate_config(*reinterpret_cast<const SamplerateConfigMessage*>(message));
break;
case Message::ID::FIFOData:
configured = true;
break;
default:
break;
}
}
void AudioTXProcessor::audio_config(const AudioTXConfigMessage& message) {
fm_delta = message.deviation_hz * (0xFFFFFFULL / baseband_fs);
tone_gen.configure(message.tone_key_delta, message.tone_key_mix_weight);
progress_interval_samples = message.divider;
resample_acc = 0;
}
void AudioTXProcessor::replay_config(const ReplayConfigMessage& message) {
if( message.config ) {
stream = std::make_unique<StreamOutput>(message.config);
// Tell application that the buffers and FIFO pointers are ready, prefill
shared_memory.application_queue.push(sig_message);
} else {
stream.reset();
}
}
void AudioTXProcessor::samplerate_config(const SamplerateConfigMessage& message) {
resample_inc = (((uint64_t)message.sample_rate) << 16) / baseband_fs; // 16.16 fixed point message.sample_rate
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<AudioTXProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_AUDIOTX_H__
#define __PROC_AUDIOTX_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "tone_gen.hpp"
#include "stream_output.hpp"
class AudioTXProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const msg) override;
private:
static constexpr size_t baseband_fs = 1536000;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Transmit };
std::unique_ptr<StreamOutput> stream { };
ToneGen tone_gen { };
uint32_t resample_inc { }, resample_acc { };
uint32_t fm_delta { 0 };
uint32_t phase { 0 }, sphase { 0 };
uint8_t audio_sample { };
int32_t sample { 0 }, delta { };
int8_t re { 0 }, im { 0 };
size_t progress_interval_samples = 0 , progress_samples = 0;
bool configured { false };
uint32_t bytes_read { 0 };
void samplerate_config(const SamplerateConfigMessage& message);
void audio_config(const AudioTXConfigMessage& message);
void replay_config(const ReplayConfigMessage& message);
TXProgressMessage txprogress_message { };
RequestSignalMessage sig_message { RequestSignalMessage::Signal::FillRequest };
};
#endif

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
* Copyright (C) 2020 Shao
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_btlerx.hpp"
#include "portapack_shared_memory.hpp"
#include "event_m4.hpp"
void BTLERxProcessor::execute(const buffer_c8_t& buffer) {
if (!configured) return;
// FM demodulation
/*const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto channel = decim_1.execute(decim_0_out, dst_buffer);
feed_channel_stats(channel);
auto audio_oversampled = demod.execute(channel, work_audio_buffer);*/
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
feed_channel_stats(decim_0_out);
auto audio_oversampled = demod.execute(decim_0_out, work_audio_buffer);
/*std::fill(spectrum.begin(), spectrum.end(), 0);
for(size_t i=0; i<spectrum.size(); i++) {
spectrum[i] += buffer.p[i];
}
const buffer_c16_t buffer_c16 {spectrum.data(),spectrum.size(),buffer.sampling_rate};
feed_channel_stats(buffer_c16);
auto audio_oversampled = demod.execute(buffer_c16, work_audio_buffer);*/
// Audio signal processing
for (size_t c = 0; c < audio_oversampled.count; c++) {
/*const int32_t sample_int = audio_oversampled.p[c] * 32768.0f;
int32_t current_sample = __SSAT(sample_int, 16);
current_sample /= 128;*/
int32_t current_sample = audio_oversampled.p[c]; //if I directly use this, some results can pass crc but not correct.
rb_head++;
rb_head=(rb_head)%RB_SIZE;
rb_buf[rb_head] = current_sample;
skipSamples = skipSamples - 1;
if (skipSamples<1)
{
int32_t threshold_tmp=0;
for (int c=0;c<8;c++)
{
threshold_tmp = threshold_tmp + (int32_t)rb_buf[(rb_head+c)%RB_SIZE];
}
g_threshold = (int32_t)threshold_tmp/8;
int transitions=0;
if (rb_buf[(rb_head+9)%RB_SIZE] > g_threshold)
{
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head + c)%RB_SIZE] > rb_buf[(rb_head + c + 1)%RB_SIZE])
transitions = transitions + 1;
}
}
else
{
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head + c)%RB_SIZE] < rb_buf[(rb_head + c + 1)%RB_SIZE])
transitions = transitions + 1;
}
}
bool packet_detected=false;
//if ( transitions==4 && abs(g_threshold)<15500)
if ( transitions==4)
{
uint8_t packet_data[500];
int packet_length;
uint32_t packet_crc;
//uint32_t calced_crc; // NOTE: restore when CRC is passing
uint64_t packet_addr_l;
//uint32_t result; // NOTE: restore when CRC is passing
uint8_t crc[3];
uint8_t packet_header_arr[2];
packet_addr_l=0;
for (int i=0;i<4;i++)
{
bool current_bit;
uint8_t byte=0;
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head + (i+1)*8 + c)%RB_SIZE] > g_threshold)
current_bit = true;
else
current_bit = false;
byte |= current_bit << (7-c);
}
uint8_t byte_temp = (uint8_t) (((byte * 0x0802LU & 0x22110LU) | (byte * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16);
packet_addr_l|=((uint64_t)byte_temp)<<(8*i);
}
channel_number = 38;
for (int t=0;t<2;t++)
{
bool current_bit;
uint8_t byte=0;
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head + 5*8+t*8 + c)%RB_SIZE] > g_threshold)
current_bit = true;
else
current_bit = false;
byte |= current_bit << (7-c);
}
packet_header_arr[t] = byte;
}
uint8_t byte_temp2 = (uint8_t) (((channel_number * 0x0802LU & 0x22110LU) | (channel_number * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16);
uint8_t lfsr_1 = byte_temp2 | 2;
int header_length = 2;
int header_counter = 0;
while(header_length--)
{
for(uint8_t i = 0x80; i; i >>= 1)
{
if(lfsr_1 & 0x80)
{
lfsr_1 ^= 0x11;
(packet_header_arr[header_counter]) ^= i;
}
lfsr_1 <<= 1;
}
header_counter = header_counter + 1;
}
if (packet_addr_l==0x8E89BED6)
{
uint8_t byte_temp3 = (uint8_t) (((packet_header_arr[1] * 0x0802LU & 0x22110LU) | (packet_header_arr[1] * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16);
packet_length=byte_temp3&0x3F;
}
else
{
packet_length=0;
}
for (int t=0;t<packet_length+2+3;t++)
{
bool current_bit;
uint8_t byte=0;
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head + 5*8+t*8 + c)%RB_SIZE] > g_threshold)
current_bit = true;
else
current_bit = false;
byte |= current_bit << (7-c);
}
packet_data[t] = byte;
}
uint8_t byte_temp4 = (uint8_t) (((channel_number * 0x0802LU & 0x22110LU) | (channel_number * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16);
uint8_t lfsr_2 = byte_temp4 | 2;
int pdu_crc_length = packet_length+2+3;
int pdu_crc_counter = 0;
while(pdu_crc_length--)
{
for(uint8_t i = 0x80; i; i >>= 1)
{
if(lfsr_2 & 0x80)
{
lfsr_2 ^= 0x11;
(packet_data[pdu_crc_counter]) ^= i;
}
lfsr_2 <<= 1;
}
pdu_crc_counter = pdu_crc_counter + 1;
}
if (packet_addr_l==0x8E89BED6)
{
crc[0]=crc[1]=crc[2]=0x55;
}
else
{
crc[0]=crc[1]=crc[2]=0;
}
uint8_t v, t, d, crc_length;
uint32_t crc_result=0;
crc_length = packet_length + 2;
int counter = 0;
while(crc_length--)
{
uint8_t byte_temp5 = (uint8_t) (((packet_data[counter] * 0x0802LU & 0x22110LU) | (packet_data[counter] * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16);
d = byte_temp5;
for(v = 0; v < 8; v++, d >>= 1)
{
t = crc[0] >> 7;
crc[0] <<= 1;
if(crc[1] & 0x80) crc[0] |= 1;
crc[1] <<= 1;
if(crc[2] & 0x80) crc[1] |= 1;
crc[2] <<= 1;
if(t != (d & 1))
{
crc[2] ^= 0x5B;
crc[1] ^= 0x06;
}
}
counter = counter + 1;
}
for (v=0;v<3;v++) crc_result=(crc_result<<8)|crc[v];
//calced_crc = crc_result; // NOTE: restore when CRC is passing
packet_crc=0;
for (int c=0;c<3;c++) packet_crc=(packet_crc<<8)|packet_data[packet_length+2+c];
if (packet_addr_l==0x8E89BED6)
//if (packet_crc==calced_crc) // NOTE: restore when CRC is passing
{
uint8_t mac_data[6];
int counter = 0;
for (int i = 7; i >= 2; i--)
{
uint8_t byte_temp6 = (uint8_t) (((packet_data[i] * 0x0802LU & 0x22110LU) | (packet_data[i] * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16);
//result = byte_temp6; // NOTE: restore when CRC is passing
mac_data[counter] = byte_temp6;
counter = counter + 1;
}
data_message.is_data = false;
data_message.value = 'A';
shared_memory.application_queue.push(data_message);
data_message.is_data = true;
data_message.value = mac_data[0];
shared_memory.application_queue.push(data_message);
data_message.is_data = true;
data_message.value = mac_data[1];
shared_memory.application_queue.push(data_message);
data_message.is_data = true;
data_message.value = mac_data[2];
shared_memory.application_queue.push(data_message);
data_message.is_data = true;
data_message.value = mac_data[3];
shared_memory.application_queue.push(data_message);
data_message.is_data = true;
data_message.value = mac_data[4];
shared_memory.application_queue.push(data_message);
data_message.is_data = true;
data_message.value = mac_data[5];
shared_memory.application_queue.push(data_message);
data_message.is_data = false;
data_message.value = 'B';
shared_memory.application_queue.push(data_message);
packet_detected = true;
}
else
packet_detected = false;
}
if (packet_detected)
{
skipSamples=20;
}
}
}
}
void BTLERxProcessor::on_message(const Message* const message) {
if (message->id == Message::ID::BTLERxConfigure)
configure(*reinterpret_cast<const BTLERxConfigureMessage*>(message));
}
void BTLERxProcessor::configure(const BTLERxConfigureMessage& message) {
(void)message; //avoid warning
decim_0.configure(taps_200k_wfm_decim_0.taps, 33554432);
decim_1.configure(taps_200k_wfm_decim_1.taps, 131072);
demod.configure(audio_fs, 5000);
configured = true;
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<BTLERxProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
* Copyright (C) 2020 Shao
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_BTLERX_H__
#define __PROC_BTLERX_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "audio_output.hpp"
#include "fifo.hpp"
#include "message.hpp"
class BTLERxProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr size_t baseband_fs = 4000000;
static constexpr size_t audio_fs = baseband_fs / 8 / 8 / 2;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
std::array<complex16_t, 512> spectrum { };
const buffer_c16_t spectrum_buffer {
spectrum.data(),
spectrum.size()
};
const buffer_s16_t work_audio_buffer {
(int16_t*)dst.data(),
sizeof(dst) / sizeof(int16_t)
};
// Array size ok down to 375 bauds (24000 / 375)
std::array<int32_t, 64> delay_line { 0 };
std::array<int16_t, 1000> rb_buf { 0 };
/*dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::decimate::FIRAndDecimateComplex channel_filter { };*/
dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0 { };
dsp::decimate::FIRC16xR16x16Decim2 decim_1 { };
dsp::demodulate::FM demod { };
int rb_head {-1};
int32_t g_threshold {0};
uint8_t channel_number {38};
int skipSamples {1000};
int RB_SIZE {1000};
bool configured { false };
void configure(const BTLERxConfigureMessage& message);
AFSKDataMessage data_message { false, 0 };
};
#endif/*__PROC_BTLERX_H__*/

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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2018 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_capture.hpp"
#include "dsp_fir_taps.hpp"
#include "event_m4.hpp"
#include "utility.hpp"
CaptureProcessor::CaptureProcessor() {
decim_0.configure(taps_200k_decim_0.taps, 33554432);
decim_1.configure(taps_200k_decim_1.taps, 131072);
channel_spectrum.set_decimation_factor(1);
}
void CaptureProcessor::execute(const buffer_c8_t& buffer) {
/* 2.4576MHz, 2048 samples */
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
const auto& decimator_out = decim_1_out;
const auto& channel = decimator_out;
if( stream ) {
const size_t bytes_to_write = sizeof(*decimator_out.p) * decimator_out.count;
const size_t written = stream->write(decimator_out.p, bytes_to_write);
if( written != bytes_to_write )
{
//TODO eventually report error somewhere
}
}
feed_channel_stats(channel);
spectrum_samples += channel.count;
if( spectrum_samples >= spectrum_interval_samples ) {
spectrum_samples -= spectrum_interval_samples;
channel_spectrum.feed(channel, channel_filter_low_f, channel_filter_high_f, channel_filter_transition);
}
}
void CaptureProcessor::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::UpdateSpectrum:
case Message::ID::SpectrumStreamingConfig:
channel_spectrum.on_message(message);
break;
case Message::ID::SamplerateConfig:
samplerate_config(*reinterpret_cast<const SamplerateConfigMessage*>(message));
break;
case Message::ID::CaptureConfig:
capture_config(*reinterpret_cast<const CaptureConfigMessage*>(message));
break;
default:
break;
}
}
void CaptureProcessor::samplerate_config(const SamplerateConfigMessage& message) {
baseband_fs = message.sample_rate;
baseband_thread.set_sampling_rate(baseband_fs);
size_t decim_0_output_fs = baseband_fs / decim_0.decimation_factor;
size_t decim_1_input_fs = decim_0_output_fs;
size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
channel_filter_low_f = taps_200k_decim_1.low_frequency_normalized * decim_1_input_fs;
channel_filter_high_f = taps_200k_decim_1.high_frequency_normalized * decim_1_input_fs;
channel_filter_transition = taps_200k_decim_1.transition_normalized * decim_1_input_fs;
spectrum_interval_samples = decim_1_output_fs / spectrum_rate_hz;
spectrum_samples = 0;
}
void CaptureProcessor::capture_config(const CaptureConfigMessage& message) {
if( message.config ) {
stream = std::make_unique<StreamInput>(message.config);
} else {
stream.reset();
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<CaptureProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2018 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_CAPTURE_HPP__
#define __PROC_CAPTURE_HPP__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_decimate.hpp"
#include "spectrum_collector.hpp"
#include "stream_input.hpp"
#include <array>
#include <memory>
class CaptureProcessor : public BasebandProcessor {
public:
CaptureProcessor();
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
// TODO: Repeated value needs to be transmitted from application side.
size_t baseband_fs = 0;
static constexpr auto spectrum_rate_hz = 50.0f;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0 { };
dsp::decimate::FIRC16xR16x16Decim2 decim_1 { };
int32_t channel_filter_low_f = 0;
int32_t channel_filter_high_f = 0;
int32_t channel_filter_transition = 0;
std::unique_ptr<StreamInput> stream { };
SpectrumCollector channel_spectrum { };
size_t spectrum_interval_samples = 0;
size_t spectrum_samples = 0;
void samplerate_config(const SamplerateConfigMessage& message);
void capture_config(const CaptureConfigMessage& message);
};
#endif/*__PROC_CAPTURE_HPP__*/

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_ert.hpp"
#include "portapack_shared_memory.hpp"
#include "event_m4.hpp"
float ERTProcessor::abs(const complex8_t& v) {
// const int16_t r = v.real() - offset_i;
// const int16_t i = v.imag() - offset_q;
// const uint32_t r2 = r * r;
// const uint32_t i2 = i * i;
// const uint32_t r2_i2 = r2 + i2;
// return std::sqrt(static_cast<float>(r2_i2));
const float r = static_cast<float>(v.real()) - offset_i;
const float i = static_cast<float>(v.imag()) - offset_q;
const float r2 = r * r;
const float i2 = i * i;
const float r2_i2 = r2 + i2;
return std::sqrt(r2_i2);
}
void ERTProcessor::execute(const buffer_c8_t& buffer) {
/* 4.194304MHz, 2048 samples */
const complex8_t* src = &buffer.p[0];
const complex8_t* const src_end = &buffer.p[buffer.count];
average_i += src->real();
average_q += src->imag();
average_count++;
if( average_count == average_window ) {
offset_i = static_cast<float>(average_i) / average_window;
offset_q = static_cast<float>(average_q) / average_window;
average_i = 0;
average_q = 0;
average_count = 0;
}
const float gain = 128 * samples_per_symbol;
const float k = 1.0f / gain;
while(src < src_end) {
float sum = 0.0f;
for(size_t i=0; i<(samples_per_symbol / 2); i++) {
sum += abs(*(src++));
}
sum_half_period[1] = sum_half_period[0];
sum_half_period[0] = sum;
sum_period[2] = sum_period[1];
sum_period[1] = sum_period[0];
sum_period[0] = (sum_half_period[0] + sum_half_period[1]) * k;
manchester[2] = manchester[1];
manchester[1] = manchester[0];
manchester[0] = sum_period[2] - sum_period[0];
const auto data = manchester[0] - manchester[2];
clock_recovery(data);
}
}
void ERTProcessor::consume_symbol(
const float raw_symbol
) {
const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
scm_builder.execute(sliced_symbol);
idm_builder.execute(sliced_symbol);
}
void ERTProcessor::scm_handler(
const baseband::Packet& packet
) {
const ERTPacketMessage message { ert::Packet::Type::SCM, packet };
shared_memory.application_queue.push(message);
}
void ERTProcessor::idm_handler(
const baseband::Packet& packet
) {
const ERTPacketMessage message { ert::Packet::Type::IDM, packet };
shared_memory.application_queue.push(message);
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<ERTProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_ERT_H__
#define __PROC_ERT_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "channel_decimator.hpp"
#include "clock_recovery.hpp"
#include "symbol_coding.hpp"
#include "packet_builder.hpp"
#include "baseband_packet.hpp"
#include "message.hpp"
#include <cstdint>
#include <cstddef>
#include <bitset>
// ''.join(['%d%d' % (c, 1-c) for c in map(int, bin(0x1f2a60)[2:].zfill(21))])
constexpr uint64_t scm_preamble_and_sync_manchester { 0b101010101001011001100110010110100101010101 };
constexpr size_t scm_preamble_and_sync_length { 42 - 10 };
constexpr size_t scm_payload_length_max { 150 };
// ''.join(['%d%d' % (c, 1-c) for c in map(int, bin(0x555516a3)[2:].zfill(32))])
constexpr uint64_t idm_preamble_and_sync_manchester { 0b0110011001100110011001100110011001010110011010011001100101011010 };
constexpr size_t idm_preamble_and_sync_length { 64 - 16 };
constexpr size_t idm_payload_length_max { 1408 };
class ERTProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
private:
const uint32_t baseband_sampling_rate = 4194304;
const size_t decimation = 1;
const float symbol_rate = 32768;
const uint32_t channel_sampling_rate = baseband_sampling_rate / decimation;
const size_t samples_per_symbol = channel_sampling_rate / symbol_rate;
const float clock_recovery_rate = symbol_rate * 2;
BasebandThread baseband_thread { baseband_sampling_rate, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
clock_recovery_rate, symbol_rate, { 1.0f / 18.0f },
[this](const float symbol) { this->consume_symbol(symbol); }
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> scm_builder {
{ scm_preamble_and_sync_manchester, scm_preamble_and_sync_length, 1 },
{ },
{ scm_payload_length_max },
[this](const baseband::Packet& packet) {
this->scm_handler(packet);
}
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> idm_builder {
{ idm_preamble_and_sync_manchester, idm_preamble_and_sync_length, 1 },
{ },
{ idm_payload_length_max },
[this](const baseband::Packet& packet) {
this->idm_handler(packet);
}
};
void consume_symbol(const float symbol);
void scm_handler(const baseband::Packet& packet);
void idm_handler(const baseband::Packet& packet);
float sum_half_period[2];
float sum_period[3];
float manchester[3];
const size_t average_window { 2048 };
int32_t average_i { 0 };
int32_t average_q { 0 };
size_t average_count { 0 };
float offset_i { 0.0f };
float offset_q { 0.0f };
float abs(const complex8_t& v);
};
#endif/*__PROC_ERT_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_fsk.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void FSKProcessor::execute(const buffer_c8_t& buffer) {
int8_t re, im;
// This is called at 2.28M/2048 = 1113Hz
for (size_t i = 0; i < buffer.count; i++) {
if (configured) {
if (sample_count >= samples_per_bit) {
if (bit_pos > length) {
// End of data
cur_bit = 0;
txprogress_message.done = true;
shared_memory.application_queue.push(txprogress_message);
configured = false;
} else {
cur_bit = (shared_memory.bb_data.data[bit_pos >> 3] << (bit_pos & 7)) & 0x80;
bit_pos++;
if (progress_count >= progress_notice) {
progress_count = 0;
txprogress_message.progress++;
txprogress_message.done = false;
shared_memory.application_queue.push(txprogress_message);
} else {
progress_count++;
}
}
sample_count = 0;
} else {
sample_count++;
}
if (cur_bit)
phase += shift_one;
else
phase += shift_zero;
sphase = phase + (64 << 24);
re = (sine_table_i8[(sphase & 0xFF000000) >> 24]);
im = (sine_table_i8[(phase & 0xFF000000) >> 24]);
} else {
re = 0;
im = 0;
}
buffer.p[i] = {re, im};
}
}
void FSKProcessor::on_message(const Message* const p) {
const auto message = *reinterpret_cast<const FSKConfigureMessage*>(p);
if (message.id == Message::ID::FSKConfigure) {
samples_per_bit = message.samples_per_bit;
length = message.stream_length + 32; // Why ?!
shift_one = message.shift * (0xFFFFFFFFULL / 2280000);
shift_zero = -shift_one;
progress_notice = message.progress_notice;
sample_count = samples_per_bit;
progress_count = 0;
bit_pos = 0;
cur_bit = 0;
txprogress_message.progress = 0;
txprogress_message.done = false;
configured = true;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<FSKProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_FSK_H__
#define __PROC_FSK_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
class FSKProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const p) override;
private:
bool configured = false;
BasebandThread baseband_thread { 2280000, this, NORMALPRIO + 20, baseband::Direction::Transmit };
uint32_t samples_per_bit { 0 };
uint32_t length { 0 };
uint32_t shift_zero { }, shift_one { };
uint32_t bit_pos { 0 };
uint32_t progress_notice { }, progress_count { 0 };
uint8_t cur_bit { 0 };
uint32_t sample_count { 0 };
uint32_t phase { 0 }, sphase { 0 };
TXProgressMessage txprogress_message { };
};
#endif

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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
* Copyright (C) 2020 Shao
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_gps_sim.hpp"
#include "sine_table_int8.hpp"
#include "portapack_shared_memory.hpp"
#include "event_m4.hpp"
#include "utility.hpp"
ReplayProcessor::ReplayProcessor() {
channel_filter_low_f = taps_200k_decim_1.low_frequency_normalized * 1000000;
channel_filter_high_f = taps_200k_decim_1.high_frequency_normalized * 1000000;
channel_filter_transition = taps_200k_decim_1.transition_normalized * 1000000;
spectrum_samples = 0;
channel_spectrum.set_decimation_factor(1);
configured = false;
}
void ReplayProcessor::execute(const buffer_c8_t& buffer) {
/* 4MHz, 2048 samples */
if (!configured) return;
// File data is in C16 format, we need C8
// File samplerate is 500kHz, we're at 4MHz
// iq_buffer can only be 512 C16 samples (RAM limitation)
// To fill up the 2048-sample C8 buffer, we need:
// 2048 samples * 2 bytes per sample = 4096 bytes
// Since we're oversampling by 4M/500k = 8, we only need 2048/8 = 256 samples from the file and duplicate them 8 times each
// So 256 * 4 bytes per sample (C16) = 1024 bytes from the file
if( stream ) { //sizeof(*buffer.p) = sizeof(C8) = 2*int8 = 2 bytes //buffer.count = 2048
const size_t bytes_to_read = sizeof(*buffer.p) * 1 * (buffer.count ); // *2 (C16), /8 (oversampling) should be == 1024
bytes_read += stream->read(iq_buffer.p, bytes_to_read);
}
// Fill and "stretch"
for (size_t i = 0; i < buffer.count; i++) {
auto re_out = iq_buffer.p[i].real() ;
auto im_out = iq_buffer.p[i].imag() ;
buffer.p[i] = { (int8_t)re_out, (int8_t)im_out };
}
spectrum_samples += buffer.count;
if( spectrum_samples >= spectrum_interval_samples ) {
spectrum_samples -= spectrum_interval_samples;
txprogress_message.progress = bytes_read / 1024; // Inform UI about progress
txprogress_message.done = false;
shared_memory.application_queue.push(txprogress_message);
}
}
void ReplayProcessor::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::UpdateSpectrum:
case Message::ID::SpectrumStreamingConfig:
channel_spectrum.on_message(message);
break;
case Message::ID::SamplerateConfig:
samplerate_config(*reinterpret_cast<const SamplerateConfigMessage*>(message));
break;
case Message::ID::ReplayConfig:
configured = false;
bytes_read = 0;
replay_config(*reinterpret_cast<const ReplayConfigMessage*>(message));
break;
// App has prefilled the buffers, we're ready to go now
case Message::ID::FIFOData:
configured = true;
break;
default:
break;
}
}
void ReplayProcessor::samplerate_config(const SamplerateConfigMessage& message) {
baseband_fs = message.sample_rate;
baseband_thread.set_sampling_rate(baseband_fs);
spectrum_interval_samples = baseband_fs / spectrum_rate_hz;
}
void ReplayProcessor::replay_config(const ReplayConfigMessage& message) {
if( message.config ) {
stream = std::make_unique<StreamOutput>(message.config);
// Tell application that the buffers and FIFO pointers are ready, prefill
shared_memory.application_queue.push(sig_message);
} else {
stream.reset();
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<ReplayProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
* Copyright (C) 2020 Shao
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_GPS_SIM_HPP__
#define __PROC_GPS_SIM_HPP__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "spectrum_collector.hpp"
#include "stream_output.hpp"
#include <array>
#include <memory>
class ReplayProcessor : public BasebandProcessor {
public:
ReplayProcessor();
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
size_t baseband_fs = 0;
static constexpr auto spectrum_rate_hz = 50.0f;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Transmit };
std::array<complex8_t, 2048> iq { };
const buffer_c8_t iq_buffer {
iq.data(),
iq.size(),
baseband_fs
};
int32_t channel_filter_low_f = 0;
int32_t channel_filter_high_f = 0;
int32_t channel_filter_transition = 0;
std::unique_ptr<StreamOutput> stream { };
SpectrumCollector channel_spectrum { };
size_t spectrum_interval_samples = 0;
size_t spectrum_samples = 0;
bool configured { false };
uint32_t bytes_read { 0 };
void samplerate_config(const SamplerateConfigMessage& message);
void replay_config(const ReplayConfigMessage& message);
TXProgressMessage txprogress_message { };
RequestSignalMessage sig_message { RequestSignalMessage::Signal::FillRequest };
};
#endif/*__PROC_GPS_SIM_HPP__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_jammer.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void JammerProcessor::execute(const buffer_c8_t& buffer) {
if (!configured) return;
for (size_t i = 0; i < buffer.count; i++) {
if (!jammer_duration) {
// Find next enabled range
do {
current_range++;
if (current_range == JAMMER_MAX_CH) current_range = 0;
} while (!jammer_channels[current_range].enabled);
jammer_duration = jammer_channels[current_range].duration;
jammer_bw = jammer_channels[current_range].width / 2; // TODO: Exact value
// Ask for retune
message.freq = jammer_channels[current_range].center;
message.range = current_range;
shared_memory.application_queue.push(message);
} else {
jammer_duration--;
}
// Phase noise
if (!period_counter) {
period_counter = noise_period;
if (noise_type == JammerType::TYPE_FSK) {
sample = (sample + lfsr) >> 1;
} else if (noise_type == JammerType::TYPE_TONE) {
tone_delta = 150000 + (lfsr >> 9); // Approx 100Hz to 6kHz
} else if (noise_type == JammerType::TYPE_SWEEP) {
sample++; // This is like saw wave FM
}
feedback = ((lfsr >> 31) ^ (lfsr >> 29) ^ (lfsr >> 15) ^ (lfsr >> 11)) & 1;
lfsr = (lfsr << 1) | feedback;
if (!lfsr) lfsr = 0x1337; // Shouldn't do this :(
} else {
period_counter--;
}
if (noise_type == JammerType::TYPE_TONE) {
aphase += tone_delta;
sample = sine_table_i8[(aphase & 0xFF000000) >> 24];
}
delta = sample * jammer_bw;
phase += delta;
sphase = phase + (64 << 24);
re = (sine_table_i8[(sphase & 0xFF000000) >> 24]);
im = (sine_table_i8[(phase & 0xFF000000) >> 24]);
buffer.p[i] = {re, im};
}
};
void JammerProcessor::on_message(const Message* const msg) {
if (msg->id == Message::ID::JammerConfigure) {
const auto message = *reinterpret_cast<const JammerConfigureMessage*>(msg);
if (message.run) {
jammer_channels = (JammerChannel*)shared_memory.bb_data.data;
noise_type = message.type;
noise_period = 3072000 / message.speed;
if (noise_type == JammerType::TYPE_SWEEP)
noise_period >>= 8;
period_counter = 0;
jammer_duration = 0;
current_range = 0;
lfsr = 0xDEAD0012;
configured = true;
} else {
configured = false;
}
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<JammerProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_JAMMER_H__
#define __PROC_JAMMER_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "portapack_shared_memory.hpp"
#include "jammer.hpp"
using namespace jammer;
class JammerProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const msg) override;
private:
bool configured { false };
BasebandThread baseband_thread { 3072000, this, NORMALPRIO + 20, baseband::Direction::Transmit };
JammerChannel * jammer_channels { };
JammerType noise_type { };
uint32_t tone_delta { 0 }, lfsr { }, feedback { };
uint32_t noise_period { 0 }, period_counter { 0 };
uint32_t jammer_duration { 0 };
uint32_t current_range { 0 };
int64_t jammer_center { 0 }, jammer_bw { 0 };
uint32_t sample_count { 0 };
uint32_t aphase { 0 }, phase { 0 }, delta { 0 }, sphase { 0 };
int8_t sample { 0 };
int8_t re { 0 }, im { 0 };
RetuneMessage message { };
};
#endif

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_mictx.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "tonesets.hpp"
#include "event_m4.hpp"
#include <cstdint>
void MicTXProcessor::execute(const buffer_c8_t& buffer){
// This is called at 1536000/2048 = 750Hz
if (!configured) return;
audio_input.read_audio_buffer(audio_buffer);
modulator->set_gain_vumeter_beep(audio_gain, play_beep ) ;
modulator->execute(audio_buffer, buffer, configured, beep_index, beep_timer, txprogress_message, level_message, power_acc_count, divider ); // Now "Key Tones & CTCSS" baseband additon inside FM mod. dsp_modulate.cpp"
/* Original fw 1.3.1 good reference, beep and vu-meter
for (size_t i = 0; i < buffer.count; i++) {
if (!play_beep) {
sample = audio_buffer.p[i >> 6] >> 8; // 1536000 / 64 = 24000
sample *= audio_gain;
power_acc += (sample < 0) ? -sample : sample; // Power average for UI vu-meter
if (power_acc_count) {
power_acc_count--;
} else {
power_acc_count = divider;
level_message.value = power_acc / (divider / 4); // Why ?
shared_memory.application_queue.push(level_message);
power_acc = 0;
}
} else {
if (beep_timer) {
beep_timer--;
} else {
beep_timer = baseband_fs * 0.05; // 50ms
if (beep_index == BEEP_TONES_NB) {
configured = false;
shared_memory.application_queue.push(txprogress_message);
} else {
beep_gen.configure(beep_deltas[beep_index], 1.0);
beep_index++;
}
}
sample = beep_gen.process(0); // TODO : Pending how to move inside modulate.cpp
}
*/
/* Original fw 1.3.1 good reference FM moulation version, including "key tones CTCSS" fw 1.3.1
sample = tone_gen.process(sample);
// FM
if (configured) {
delta = sample * fm_delta;
phase += delta;
sphase = phase >> 24;
re = (sine_table_i8[(sphase + 64) & 255]);
im = (sine_table_i8[sphase]);
} else {
re = 0;
im = 0;
}
buffer.p[i] = { re, im };
} */
}
void MicTXProcessor::on_message(const Message* const msg) {
const AudioTXConfigMessage config_message = *reinterpret_cast<const AudioTXConfigMessage*>(msg);
const RequestSignalMessage request_message = *reinterpret_cast<const RequestSignalMessage*>(msg);
switch(msg->id) {
case Message::ID::AudioTXConfig:
if (fm_enabled) {
dsp::modulate::FM *fm = new dsp::modulate::FM();
// Config fm_delta private var inside DSP modulate.cpp
fm->set_fm_delta(config_message.deviation_hz * (0xFFFFFFUL / baseband_fs));
// Config properly the private tone_gen function parameters inside DSP modulate.cpp
fm->set_tone_gen_configure(config_message.tone_key_delta, config_message.tone_key_mix_weight);
modulator = fm;
}
if (usb_enabled) {
modulator = new dsp::modulate::SSB();
modulator->set_mode(dsp::modulate::Mode::USB);
}
if (lsb_enabled) {
modulator = new dsp::modulate::SSB();
modulator->set_mode(dsp::modulate::Mode::LSB);
}
if (am_enabled) {
modulator = new dsp::modulate::AM();
modulator->set_mode(dsp::modulate::Mode::AM);
}
if (dsb_enabled) {
modulator = new dsp::modulate::AM();
modulator->set_mode(dsp::modulate::Mode::DSB);
}
modulator->set_over(baseband_fs / 24000); // Keep no change.
am_enabled = config_message.am_enabled;
usb_enabled = config_message.usb_enabled;
lsb_enabled = config_message.lsb_enabled;
dsb_enabled = config_message.dsb_enabled;
if (!am_enabled || !usb_enabled || !lsb_enabled || !dsb_enabled) {
fm_enabled = true;
}
audio_gain = config_message.audio_gain;
divider = config_message.divider;
power_acc_count = 0;
// now this config moved, in the case Message::ID::AudioTXConfig , only FM case.
// tone_gen.configure(config_message.tone_key_delta, config_message.tone_key_mix_weight);
txprogress_message.done = true;
play_beep = false;
configured = true;
break;
case Message::ID::RequestSignal:
if (request_message.signal == RequestSignalMessage::Signal::BeepRequest) {
beep_index = 0;
beep_timer = 0;
play_beep = true;
}
break;
default:
break;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<MicTXProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_MICTX_H__
#define __PROC_MICTX_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "audio_input.hpp"
#include "tone_gen.hpp"
#include "dsp_modulate.hpp"
class MicTXProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const msg) override;
private:
static constexpr size_t baseband_fs = 1536000U;
bool configured { false };
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Transmit };
int16_t audio_data[64];
buffer_s16_t audio_buffer {
audio_data,
sizeof(int16_t) * 64
};
AudioInput audio_input { };
// ToneGen tone_gen { }; moved to dsp_modulate.cpp
// ToneGen beep_gen { }; moved to dsp_modulate.cpp
dsp::modulate::Modulator *modulator = NULL ;
bool am_enabled { false };
bool fm_enabled { true };
bool usb_enabled { false };
bool lsb_enabled { false };
bool dsb_enabled { false };
uint32_t divider { };
float audio_gain { };
uint64_t power_acc { 0 };
uint32_t power_acc_count { 0 };
bool play_beep { false };
uint32_t fm_delta { 0 };
uint32_t phase { 0 }, sphase { 0 };
int32_t sample { 0 }, delta { };
uint32_t beep_index { }, beep_timer { };
int8_t re { 0 }, im { 0 };
AudioLevelReportMessage level_message { };
TXProgressMessage txprogress_message { };
};
#endif

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_nfm_audio.hpp"
#include "sine_table_int8.hpp"
#include "portapack_shared_memory.hpp"
#include "event_m4.hpp"
#include <cstdint>
#include <cstddef>
void NarrowbandFMAudio::execute(const buffer_c8_t& buffer) {
//bool new_state;
if( !configured ) {
return;
}
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
channel_spectrum.feed(decim_1_out, channel_filter_low_f, channel_filter_high_f, channel_filter_transition);
const auto channel_out = channel_filter.execute(decim_1_out, dst_buffer);
feed_channel_stats(channel_out);
if (!pitch_rssi_enabled) {
// Normal mode, output demodulated audio
auto audio = demod.execute(channel_out, audio_buffer);
audio_output.write(audio);
if (ctcss_detect_enabled) {
/* 24kHz int16_t[16]
* -> FIR filter, <300Hz pass, >300Hz stop, gain of 1
* -> 12kHz int16_t[8] */
auto audio_ctcss = ctcss_filter.execute(audio, work_audio_buffer);
// s16 to f32 for hpf
std::array<float, 8> audio_f;
for (size_t i = 0; i < audio_ctcss.count; i++) {
audio_f[i] = audio_ctcss.p[i] * ki;
}
hpf.execute_in_place(buffer_f32_t {
audio_f.data(),
audio_ctcss.count,
audio_ctcss.sampling_rate
});
// Zero-crossing detection
for (size_t c = 0; c < audio_ctcss.count; c++) {
cur_sample = audio_f[c];
if (cur_sample * prev_sample < 0.0) {
z_acc += z_timer;
z_timer = 0;
z_count++;
} else
z_timer++;
prev_sample = cur_sample;
}
if (z_count >= 30) {
ctcss_message.value = (100 * 12000 / 2 * z_count) / z_acc;
shared_memory.application_queue.push(ctcss_message);
z_count = 0;
z_acc = 0;
}
}
} else {
// Direction-finding mode; output tone with pitch related to RSSI
for (size_t c = 0; c < 16; c++) {
tone_buffer.p[c] = (sine_table_i8[(tone_phase & 0xFF000000U) >> 24]) * 128;
tone_phase += tone_delta;
}
audio_output.write(tone_buffer);
/*new_state = audio_output.is_squelched();
if (new_state && !old_state)
shared_memory.application_queue.push(sig_message);
old_state = new_state;*/
}
}
void NarrowbandFMAudio::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::UpdateSpectrum:
case Message::ID::SpectrumStreamingConfig:
channel_spectrum.on_message(message);
break;
case Message::ID::NBFMConfigure:
configure(*reinterpret_cast<const NBFMConfigureMessage*>(message));
break;
case Message::ID::CaptureConfig:
capture_config(*reinterpret_cast<const CaptureConfigMessage*>(message));
break;
case Message::ID::PitchRSSIConfigure:
pitch_rssi_config(*reinterpret_cast<const PitchRSSIConfigureMessage*>(message));
break;
default:
break;
}
}
void NarrowbandFMAudio::configure(const NBFMConfigureMessage& message) {
constexpr size_t decim_0_input_fs = baseband_fs;
constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;
constexpr size_t decim_1_input_fs = decim_0_output_fs;
constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
constexpr size_t channel_filter_input_fs = decim_1_output_fs;
const size_t channel_filter_output_fs = channel_filter_input_fs / message.channel_decimation;
const size_t demod_input_fs = channel_filter_output_fs;
decim_0.configure(message.decim_0_filter.taps, 33554432);
decim_1.configure(message.decim_1_filter.taps, 131072);
channel_filter.configure(message.channel_filter.taps, message.channel_decimation);
demod.configure(demod_input_fs, message.deviation);
channel_filter_low_f = message.channel_filter.low_frequency_normalized * channel_filter_input_fs;
channel_filter_high_f = message.channel_filter.high_frequency_normalized * channel_filter_input_fs;
channel_filter_transition = message.channel_filter.transition_normalized * channel_filter_input_fs;
channel_spectrum.set_decimation_factor(1.0f);
audio_output.configure(message.audio_hpf_config, message.audio_deemph_config, (float)message.squelch_level / 100.0);
hpf.configure(audio_24k_hpf_30hz_config);
ctcss_filter.configure(taps_64_lp_025_025.taps);
configured = true;
}
void NarrowbandFMAudio::pitch_rssi_config(const PitchRSSIConfigureMessage& message) {
pitch_rssi_enabled = message.enabled;
tone_delta = (message.rssi + 1000) * ((1ULL << 32) / 24000);
}
void NarrowbandFMAudio::capture_config(const CaptureConfigMessage& message) {
if( message.config ) {
audio_output.set_stream(std::make_unique<StreamInput>(message.config));
} else {
audio_output.set_stream(nullptr);
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<NarrowbandFMAudio>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_NFM_AUDIO_H__
#define __PROC_NFM_AUDIO_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "dsp_iir.hpp"
#include "audio_output.hpp"
#include "spectrum_collector.hpp"
#include <cstdint>
class NarrowbandFMAudio : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr size_t baseband_fs = 3072000;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
const buffer_s16_t work_audio_buffer {
(int16_t*)dst.data(),
sizeof(dst) / sizeof(int16_t)
};
std::array<int16_t, 16> audio { };
const buffer_s16_t audio_buffer {
(int16_t*)audio.data(),
sizeof(audio) / sizeof(int16_t)
};
std::array<int16_t, 16> tone { };
const buffer_s16_t tone_buffer {
(int16_t*)tone.data(),
sizeof(tone) / sizeof(int16_t)
};
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::decimate::FIRAndDecimateComplex channel_filter { };
int32_t channel_filter_low_f = 0;
int32_t channel_filter_high_f = 0;
int32_t channel_filter_transition = 0;
// For CTCSS decoding
dsp::decimate::FIR64AndDecimateBy2Real ctcss_filter { };
IIRBiquadFilter hpf { };
dsp::demodulate::FM demod { };
AudioOutput audio_output { };
SpectrumCollector channel_spectrum { };
uint32_t tone_phase { 0 };
uint32_t tone_delta { 0 };
bool pitch_rssi_enabled { false };
float cur_sample { }, prev_sample { };
uint32_t z_acc { 0}, z_timer { 0 }, z_count { 0 };
bool ctcss_detect_enabled { true };
static constexpr float k = 32768.0f;
static constexpr float ki = 1.0f / k;
bool configured { false };
void pitch_rssi_config(const PitchRSSIConfigureMessage& message);
void configure(const NBFMConfigureMessage& message);
void capture_config(const CaptureConfigMessage& message);
//RequestSignalMessage sig_message { RequestSignalMessage::Signal::Squelched };
CodedSquelchMessage ctcss_message { 0 };
};
#endif/*__PROC_NFM_AUDIO_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_noop.hpp"
#include "event_m4.hpp"
#include <cstdint>
void NOOPProcessor::execute(const buffer_c8_t& buffer) {
for (size_t i = 0; i<buffer.count; i++) {
buffer.p[i] = {0, 0};
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<NOOPProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_NOOP_H__
#define __PROC_NOOP_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
class NOOPProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
private:
BasebandThread baseband_thread { 1536000, this, NORMALPRIO + 20, baseband::Direction::Transmit };
};
#endif

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
* Copyright (C) 2020 Shao
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_nrfrx.hpp"
#include "portapack_shared_memory.hpp"
#include "event_m4.hpp"
void NRFRxProcessor::execute(const buffer_c8_t& buffer) {
if (!configured) return;
// FM demodulation
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
feed_channel_stats(decim_0_out);
auto audio_oversampled = demod.execute(decim_0_out, work_audio_buffer);
// Audio signal processing
for (size_t c = 0; c < audio_oversampled.count; c++) {
int g_srate = 4; //4 for 250KPS
//int g_srate = 1; //1 for 1MPS, not working yet
int32_t current_sample = audio_oversampled.p[c]; //if I directly use this, some results can pass crc but not correct.
rb_head++;
rb_head=(rb_head)%RB_SIZE;
rb_buf[rb_head] = current_sample;
skipSamples = skipSamples - 1;
if (skipSamples<1)
{
int32_t threshold_tmp=0;
for (int c=0;c<8*g_srate;c++)
{
threshold_tmp = threshold_tmp + (int32_t)rb_buf[(rb_head+c)%RB_SIZE];
}
g_threshold = (int32_t)threshold_tmp/(8*g_srate);
int transitions=0;
if (rb_buf[(rb_head + 9*g_srate)%RB_SIZE] > g_threshold)
{
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head + c*g_srate)%RB_SIZE] > rb_buf[(rb_head + (c+1)*g_srate)%RB_SIZE])
transitions = transitions + 1;
}
}
else
{
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head + c*g_srate)%RB_SIZE] < rb_buf[(rb_head + (c+1)*g_srate)%RB_SIZE])
transitions = transitions + 1;
}
}
bool packet_detected=false;
//if ( transitions==4 && abs(g_threshold)<15500)
if ( transitions==4 && abs(g_threshold)<15500)
{
int packet_length = 0;
uint8_t tmp_buf[10];
uint8_t packet_data[500];
uint8_t packet_packed[50];
uint16_t pcf;
uint32_t packet_crc;
uint32_t calced_crc;
uint64_t packet_addr_l;
/* extract address */
packet_addr_l=0;
for (int t=0;t<5;t++)
{
bool current_bit;
uint8_t byte=0;
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head+(1*8+t*8+c)*g_srate)%RB_SIZE] > g_threshold)
current_bit = true;
else
current_bit = false;
byte |= current_bit << (7-c);
}
tmp_buf[t]=byte;
}
for (int t=0;t<5;t++) packet_addr_l|=((uint64_t)tmp_buf[t])<<(4-t)*8;
//channel_number = 26;
/* extract pcf */
for (int t=0;t<2;t++)
{
bool current_bit;
uint8_t byte=0;
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head+(6*8+t*8+c)*g_srate)%RB_SIZE] > g_threshold)
current_bit = true;
else
current_bit = false;
byte |= current_bit << (7-c);
}
tmp_buf[t]=byte;
}
pcf = tmp_buf[0]<<8 | tmp_buf[1];
pcf >>=7;
/* extract packet length, avoid excessive length packets */
if(packet_length == 0)
packet_length=(int)pcf>>3;
if (packet_length>32)
packet_detected = false;
/* extract data */
for (int t=0;t<packet_length;t++)
{
bool current_bit;
uint8_t byte=0;
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head+(6*8+9+t*8+c)*g_srate)%RB_SIZE] > g_threshold)
current_bit = true;
else
current_bit = false;
byte |= current_bit << (7-c);
}
packet_data[t]=byte;
}
/* Prepare packed bit stream for CRC calculation */
uint64_t packet_header=packet_addr_l;
packet_header<<=9;
packet_header|=pcf;
for (int c=0;c<7;c++){
packet_packed[c]=(packet_header>>((6-c)*8))&0xFF;
}
for (int c=0;c<packet_length;c++){
packet_packed[c+7]=packet_data[c];
}
/* calculate packet crc */
const uint8_t* data = packet_packed;
size_t data_len = 7+packet_length;
bool bit;
uint8_t cc;
uint_fast16_t crc=0x3C18;
while (data_len--) {
cc = *data++;
for (uint8_t i = 0x80; i > 0; i >>= 1)
{
bit = crc & 0x8000;
if (cc & i)
{
bit = !bit;
}
crc <<= 1;
if (bit)
{
crc ^= 0x1021;
}
}
crc &= 0xffff;
}
calced_crc = (uint16_t)(crc & 0xffff);
/* extract crc */
for (int t=0;t<2;t++)
{
bool current_bit;
uint8_t byte=0;
for (int c=0;c<8;c++)
{
if (rb_buf[(rb_head+((6+packet_length)*8+9+t*8+c)*g_srate)%RB_SIZE] > g_threshold)
current_bit = true;
else
current_bit = false;
byte |= current_bit << (7-c);
}
tmp_buf[t]=byte;
}
packet_crc = tmp_buf[0]<<8 | tmp_buf[1];
/* NRF24L01+ packet found, dump information */
//if (packet_addr_l==0xE7E7E7E7)
if (packet_crc==calced_crc)
{
data_message.is_data = false;
data_message.value = 'A';
shared_memory.application_queue.push(data_message);
data_message.is_data = true;
data_message.value = packet_addr_l;
shared_memory.application_queue.push(data_message);
for (int c=0;c<7;c++)
{
data_message.is_data = true;
data_message.value = packet_addr_l >> 8;
shared_memory.application_queue.push(data_message);
}
/*data_message.is_data = true;
data_message.value = packet_addr_l;
shared_memory.application_queue.push(data_message);
data_message.is_data = true;
data_message.value = packet_addr_l >> 8;
shared_memory.application_queue.push(data_message);*/
data_message.is_data = false;
data_message.value = 'B';
shared_memory.application_queue.push(data_message);
for (int c=0;c<packet_length;c++)
{
data_message.is_data = true;
data_message.value = packet_data[c];
shared_memory.application_queue.push(data_message);
}
data_message.is_data = false;
data_message.value = 'C';
shared_memory.application_queue.push(data_message);
packet_detected = true;
}
else
packet_detected = false;
}
if (packet_detected)
{
skipSamples=20;
}
}
}
}
void NRFRxProcessor::on_message(const Message* const message) {
if (message->id == Message::ID::NRFRxConfigure)
configure(*reinterpret_cast<const NRFRxConfigureMessage*>(message));
}
void NRFRxProcessor::configure(const NRFRxConfigureMessage& message) {
(void)message; //avoir unused warning
decim_0.configure(taps_200k_wfm_decim_0.taps, 33554432);
decim_1.configure(taps_200k_wfm_decim_1.taps, 131072);
demod.configure(audio_fs, 5000);
configured = true;
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<NRFRxProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
* Copyright (C) 2020 Shao
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_NRFRX_H__
#define __PROC_NRFRX_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "audio_output.hpp"
#include "fifo.hpp"
#include "message.hpp"
class NRFRxProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr size_t baseband_fs = 4000000;
static constexpr size_t audio_fs = baseband_fs / 8 / 8 / 2;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
std::array<complex16_t, 512> spectrum { };
const buffer_c16_t spectrum_buffer {
spectrum.data(),
spectrum.size()
};
const buffer_s16_t work_audio_buffer {
(int16_t*)dst.data(),
sizeof(dst) / sizeof(int16_t)
};
// Array size ok down to 375 bauds (24000 / 375)
std::array<int32_t, 64> delay_line { 0 };
std::array<int16_t, 1000> rb_buf { 0 };
/*dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::decimate::FIRAndDecimateComplex channel_filter { };*/
dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0 { };
dsp::decimate::FIRC16xR16x16Decim2 decim_1 { };
dsp::demodulate::FM demod { };
int rb_head {-1};
int32_t g_threshold {0};
//uint8_t g_srate {8};
uint8_t channel_number {38};
int skipSamples {1000};
int RB_SIZE {1000};
bool configured { false };
void configure(const NRFRxConfigureMessage& message);
AFSKDataMessage data_message { false, 0 };
};
#endif/*__PROC_NRFRX_H__*/

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_ook.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void OOKProcessor::execute(const buffer_c8_t& buffer) {
int8_t re, im;
// This is called at 2.28M/2048 = 1113Hz
if (!configured) return;
for (size_t i = 0; i < buffer.count; i++) {
// Synthesis at 2.28M/10 = 228kHz
if (!s) {
s = 10 - 1;
if (sample_count >= samples_per_bit) {
if (configured) {
if (bit_pos >= length) {
// End of data
if (pause_counter == 0) {
pause_counter = pause;
cur_bit = 0;
} else if (pause_counter == 1) {
if (repeat_counter < repeat) {
// Repeat
bit_pos = 0;
cur_bit = shared_memory.bb_data.data[0] & 0x80;
txprogress_message.progress = repeat_counter + 1;
txprogress_message.done = false;
shared_memory.application_queue.push(txprogress_message);
repeat_counter++;
} else {
// Stop
cur_bit = 0;
txprogress_message.done = true;
shared_memory.application_queue.push(txprogress_message);
configured = false;
}
pause_counter = 0;
} else {
pause_counter--;
}
} else {
cur_bit = (shared_memory.bb_data.data[bit_pos >> 3] << (bit_pos & 7)) & 0x80;
bit_pos++;
}
}
sample_count = 0;
} else {
sample_count++;
}
} else {
s--;
}
if (cur_bit) {
phase = (phase + 200); // What ?
sphase = phase + (64 << 18);
re = (sine_table_i8[(sphase & 0x03FC0000) >> 18]);
im = (sine_table_i8[(phase & 0x03FC0000) >> 18]);
} else {
re = 0;
im = 0;
}
buffer.p[i] = {re, im};
}
}
void OOKProcessor::on_message(const Message* const p) {
const auto message = *reinterpret_cast<const OOKConfigureMessage*>(p);
if (message.id == Message::ID::OOKConfigure) {
samples_per_bit = message.samples_per_bit / 10;
repeat = message.repeat - 1;
length = message.stream_length;
pause = message.pause_symbols + 1;
pause_counter = 0;
s = 0;
sample_count = samples_per_bit;
repeat_counter = 0;
bit_pos = 0;
cur_bit = 0;
txprogress_message.progress = 0;
txprogress_message.done = false;
configured = true;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<OOKProcessor>() };
event_dispatcher.run();
return 0;
}

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PROC_OOK_H__
#define __PROC_OOK_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
class OOKProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const p) override;
private:
bool configured = false;
BasebandThread baseband_thread { 2280000, this, NORMALPRIO + 20, baseband::Direction::Transmit };
uint32_t samples_per_bit { 0 };
uint8_t repeat { 0 };
uint32_t length { 0 };
uint32_t pause { 0 };
uint32_t pause_counter { 0 };
uint8_t repeat_counter { 0 };
uint8_t s { 0 };
uint16_t bit_pos { 0 };
uint8_t cur_bit { 0 };
uint32_t sample_count { 0 };
uint32_t tone_phase { 0 }, phase { 0 }, sphase { 0 };
int32_t tone_sample { 0 }, sig { 0 }, frq { 0 };
TXProgressMessage txprogress_message { };
};
#endif

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/*
* Copyright (C) 1996 Thomas Sailer (sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu)
* Copyright (C) 2012-2014 Elias Oenal (multimon-ng@eliasoenal.com)
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "proc_pocsag.hpp"
#include "event_m4.hpp"
#include <cstdint>
#include <cstddef>
#include <algorithm> // std::max
#include <cmath>
void POCSAGProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 1500Hz
if (!configured) return;
// Get 24kHz audio
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
const auto channel_out = channel_filter.execute(decim_1_out, dst_buffer);
auto audio = demod.execute(channel_out, audio_buffer);
smooth.Process(audio.p, audio.count); // Smooth the data to make decoding more accurate
audio_output.write(audio);
processDemodulatedSamples(audio.p, 16);
extractFrames();
}
// ====================================================================
//
// ====================================================================
int POCSAGProcessor::OnDataWord(uint32_t word, int pos)
{
packet.set(pos, word);
return 0;
}
// ====================================================================
//
// ====================================================================
int POCSAGProcessor::OnDataFrame(int len, int baud)
{
if (len > 0)
{
packet.set_bitrate(baud);
packet.set_flag(pocsag::PacketFlag::NORMAL);
packet.set_timestamp(Timestamp::now());
const POCSAGPacketMessage message(packet);
shared_memory.application_queue.push(message);
}
return 0;
}
void POCSAGProcessor::on_message(const Message* const message) {
if (message->id == Message::ID::POCSAGConfigure)
configure();
}
void POCSAGProcessor::configure() {
constexpr size_t decim_0_input_fs = baseband_fs;
constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;
constexpr size_t decim_1_input_fs = decim_0_output_fs;
constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
constexpr size_t channel_filter_input_fs = decim_1_output_fs;
const size_t channel_filter_output_fs = channel_filter_input_fs / 2;
const size_t demod_input_fs = channel_filter_output_fs;
decim_0.configure(taps_11k0_decim_0.taps, 33554432);
decim_1.configure(taps_11k0_decim_1.taps, 131072);
channel_filter.configure(taps_11k0_channel.taps, 2);
demod.configure(demod_input_fs, 4500);
// Smoothing should be roughly sample rate over max baud
// 24k / 3.2k is 7.5
smooth.SetSize(8);
audio_output.configure(false);
// Set up the frame extraction, limits of baud
setFrameExtractParams(demod_input_fs, 4000, 300, 32);
// Mark the class as ready to accept data
configured = true;
}
// -----------------------------
// Frame extractraction methods
// -----------------------------
#define BAUD_STABLE (104)
#define MAX_CONSEC_SAME (32)
#define MAX_WITHOUT_SINGLE (64)
#define MAX_BAD_TRANS (10)
#define M_SYNC (0x7cd215d8)
#define M_NOTSYNC (0x832dea27)
#define M_IDLE (0x7a89c197)
// ====================================================================
//
// ====================================================================
inline int bitsDiff(unsigned long left, unsigned long right)
{
unsigned long xord = left ^ right;
int count = 0;
for (int i = 0; i < 32; i++)
{
if ((xord & 0x01) != 0) ++count;
xord = xord >> 1;
}
return(count);
}
// ====================================================================
//
// ====================================================================
void POCSAGProcessor::initFrameExtraction()
{
m_averageSymbolLen_1024 = m_maxSymSamples_1024;
m_lastStableSymbolLen_1024 = m_minSymSamples_1024;
m_badTransitions = 0;
m_bitsStart = 0;
m_bitsEnd = 0;
m_inverted = false;
resetVals();
}
// ====================================================================
//
// ====================================================================
void POCSAGProcessor::resetVals()
{
// Reset the parameters
// --------------------
m_goodTransitions = 0;
m_badTransitions = 0;
m_averageSymbolLen_1024 = m_maxSymSamples_1024;
m_shortestGoodTrans_1024 = m_maxSymSamples_1024;
m_valMid = 0;
// And reset the counts
// --------------------
m_lastTransPos_1024 = 0;
m_lastBitPos_1024 = 0;
m_lastSample = 0;
m_sampleNo = 0;
m_nextBitPos_1024 = m_maxSymSamples_1024;
m_nextBitPosInt = (long)m_nextBitPos_1024;
// Extraction
m_fifo.numBits = 0;
m_gotSync = false;
m_numCode = 0;
}
// ====================================================================
//
// ====================================================================
void POCSAGProcessor::setFrameExtractParams(long a_samplesPerSec, long a_maxBaud, long a_minBaud, long maxRunOfSameValue)
{
m_samplesPerSec = a_samplesPerSec;
m_minSymSamples_1024 = (uint32_t)(1024.0f * (float)a_samplesPerSec / (float)a_maxBaud);
m_maxSymSamples_1024 = (uint32_t)(1024.0f*(float)a_samplesPerSec / (float)a_minBaud);
m_maxRunOfSameValue = maxRunOfSameValue;
m_shortestGoodTrans_1024 = m_maxSymSamples_1024;
m_averageSymbolLen_1024 = m_maxSymSamples_1024;
m_lastStableSymbolLen_1024 = m_minSymSamples_1024;
m_nextBitPos_1024 = m_averageSymbolLen_1024 / 2;
m_nextBitPosInt = m_nextBitPos_1024 >> 10;
initFrameExtraction();
}
// ====================================================================
//
// ====================================================================
int POCSAGProcessor::processDemodulatedSamples(float * sampleBuff, int noOfSamples)
{
bool transition = false;
uint32_t samplePos_1024 = 0;
uint32_t len_1024 = 0;
// Loop through the block of data
// ------------------------------
for (int pos = 0; pos < noOfSamples; ++pos)
{
m_sample = sampleBuff[pos];
m_valMid += (m_sample - m_valMid) / 1024.0f;
++m_sampleNo;
// Detect Transition
// -----------------
transition = ! ((m_lastSample < m_valMid) ^ (m_sample >= m_valMid)); // use XOR for speed
// If this is a transition
// -----------------------
if (transition)
{
// Calculate samples since last trans
// ----------------------------------
int32_t fractional_1024 = (int32_t)(((m_sample - m_valMid)*1024) / (m_sample - m_lastSample));
if (fractional_1024 < 0) { fractional_1024 = -fractional_1024; }
samplePos_1024 = (m_sampleNo<<10)-fractional_1024;
len_1024 = samplePos_1024 - m_lastTransPos_1024;
m_lastTransPos_1024 = samplePos_1024;
// If symbol is large enough to be valid
// -------------------------------------
if (len_1024 > m_minSymSamples_1024)
{
// Check for shortest good transition
// ----------------------------------
if ((len_1024 < m_shortestGoodTrans_1024) &&
(m_goodTransitions < BAUD_STABLE)) // detect change of symbol size
{
int32_t fractionOfShortest_1024 = (len_1024<<10) / m_shortestGoodTrans_1024;
// If currently at half the baud rate
// ----------------------------------
if ((fractionOfShortest_1024 > 410) && (fractionOfShortest_1024 < 614)) // 0.4 and 0.6
{
m_averageSymbolLen_1024 /= 2;
m_shortestGoodTrans_1024 = len_1024;
}
// If currently at the wrong baud rate
// -----------------------------------
else if (fractionOfShortest_1024 < 768) // 0.75
{
m_averageSymbolLen_1024 = len_1024;
m_shortestGoodTrans_1024 = len_1024;
m_goodTransitions = 0;
m_lastSingleBitPos_1024 = samplePos_1024 - len_1024;
}
}
// Calc the number of bits since events
// ------------------------------------
int32_t halfSymbol_1024 = m_averageSymbolLen_1024 / 2;
int bitsSinceLastTrans = max((uint32_t)1, (len_1024+halfSymbol_1024) / m_averageSymbolLen_1024 );
int bitsSinceLastSingle = (((m_sampleNo<<10)-m_lastSingleBitPos_1024) + halfSymbol_1024) / m_averageSymbolLen_1024;
// Check for single bit
// --------------------
if (bitsSinceLastTrans == 1)
{
m_lastSingleBitPos_1024 = samplePos_1024;
}
// If too long since last transition
// ---------------------------------
if (bitsSinceLastTrans > MAX_CONSEC_SAME)
{
resetVals();
}
// If too long sice last single bit
// --------------------------------
else if (bitsSinceLastSingle > MAX_WITHOUT_SINGLE)
{
resetVals();
}
else
{
// If this is a good transition
// ----------------------------
int32_t offsetFromExtectedTransition_1024 = len_1024 - (bitsSinceLastTrans*m_averageSymbolLen_1024);
if (offsetFromExtectedTransition_1024 < 0) { offsetFromExtectedTransition_1024 = -offsetFromExtectedTransition_1024; }
if (offsetFromExtectedTransition_1024 < ((int32_t)m_averageSymbolLen_1024 / 4)) // Has to be within 1/4 of symbol to be good
{
++m_goodTransitions;
uint32_t bitsCount = min((uint32_t)BAUD_STABLE, m_goodTransitions);
uint32_t propFromPrevious = m_averageSymbolLen_1024*bitsCount;
uint32_t propFromCurrent = (len_1024 / bitsSinceLastTrans);
m_averageSymbolLen_1024 = (propFromPrevious + propFromCurrent) / (bitsCount + 1);
m_badTransitions = 0;
//if ( len < m_shortestGoodTrans ){m_shortestGoodTrans = len;}
// Store the old symbol size
if (m_goodTransitions >= BAUD_STABLE)
{
m_lastStableSymbolLen_1024 = m_averageSymbolLen_1024;
}
}
}
// Set the point of the last bit if not yet stable
// -----------------------------------------------
if ((m_goodTransitions < BAUD_STABLE) || (m_badTransitions > 0))
{
m_lastBitPos_1024 = samplePos_1024 - (m_averageSymbolLen_1024 / 2);
}
// Calculate the exact positiom of the next bit
// --------------------------------------------
int32_t thisPlusHalfsymbol_1024 = samplePos_1024 + (m_averageSymbolLen_1024/2);
int32_t lastPlusSymbol = m_lastBitPos_1024 + m_averageSymbolLen_1024;
m_nextBitPos_1024 = lastPlusSymbol + ((thisPlusHalfsymbol_1024 - lastPlusSymbol) / 16);
// Check for bad pos error
// -----------------------
if (m_nextBitPos_1024 < samplePos_1024) m_nextBitPos_1024 += m_averageSymbolLen_1024;
// Calculate integer sample after next bit
// ---------------------------------------
m_nextBitPosInt = (m_nextBitPos_1024>>10) + 1;
} // symbol is large enough to be valid
else
{
// Bad transition, so reset the counts
// -----------------------------------
++m_badTransitions;
if (m_badTransitions > MAX_BAD_TRANS)
{
resetVals();
}
}
} // end of if transition
// Reached the point of the next bit
// ---------------------------------
if (m_sampleNo >= m_nextBitPosInt)
{
// Everything is good so extract a bit
// -----------------------------------
if (m_goodTransitions > 20)
{
// Store value at the center of bit
// --------------------------------
storeBit();
}
// Check for long 1 or zero
// ------------------------
uint32_t bitsSinceLastTrans = ((m_sampleNo<<10) - m_lastTransPos_1024) / m_averageSymbolLen_1024;
if (bitsSinceLastTrans > m_maxRunOfSameValue)
{
resetVals();
}
// Store the point of the last bit
// -------------------------------
m_lastBitPos_1024 = m_nextBitPos_1024;
// Calculate the exact point of the next bit
// -----------------------------------------
m_nextBitPos_1024 += m_averageSymbolLen_1024;
// Look for the bit after the next bit pos
// ---------------------------------------
m_nextBitPosInt = (m_nextBitPos_1024>>10) + 1;
} // Reached the point of the next bit
m_lastSample = m_sample;
} // Loop through the block of data
return getNoOfBits();
}
// ====================================================================
//
// ====================================================================
void POCSAGProcessor::storeBit()
{
if (++m_bitsStart >= BIT_BUF_SIZE) { m_bitsStart = 0; }
// Calculate the bit value
float sample = (m_sample + m_lastSample) / 2;
//int32_t sample_1024 = m_sample_1024;
bool bit = sample > m_valMid;
// If buffer not full
if (m_bitsStart != m_bitsEnd)
{
// Decide on output val
if (bit)
{
m_bits[m_bitsStart] = 0;
}
else
{
m_bits[m_bitsStart] = 1;
}
}
// Throw away bits if the buffer is full
else
{
if (--m_bitsStart <= -1)
{
m_bitsStart = BIT_BUF_SIZE - 1;
}
}
}
// ====================================================================
//
// ====================================================================
int POCSAGProcessor::extractFrames()
{
int msgCnt = 0;
// While there is unread data in the bits buffer
//----------------------------------------------
while (getNoOfBits() > 0)
{
m_fifo.codeword = (m_fifo.codeword << 1) + getBit();
m_fifo.numBits++;
// If number of bits in fifo equals 32
//------------------------------------
if (m_fifo.numBits >= 32)
{
// Not got sync
// ------------
if (!m_gotSync)
{
if (bitsDiff(m_fifo.codeword, M_SYNC) <= 2)
{
m_inverted = false;
m_gotSync = true;
m_numCode = -1;
m_fifo.numBits = 0;
}
else if (bitsDiff(m_fifo.codeword, M_NOTSYNC) <= 2)
{
m_inverted = true;
m_gotSync = true;
m_numCode = -1;
m_fifo.numBits = 0;
}
else
{
// Cause it to load one more bit
m_fifo.numBits = 31;
}
} // Not got sync
else
{
// Increment the word count
// ------------------------
++m_numCode; // It got set to -1 when a sync was found, now count the 16 words
uint32_t val = m_inverted ? ~m_fifo.codeword : m_fifo.codeword;
OnDataWord(val, m_numCode);
// If at the end of a 16 word block
// --------------------------------
if (m_numCode >= 15)
{
msgCnt += OnDataFrame(m_numCode+1, (m_samplesPerSec<<10) / m_lastStableSymbolLen_1024);
m_gotSync = false;
m_numCode = -1;
}
m_fifo.numBits = 0;
}
} // If number of bits in fifo equals 32
} // While there is unread data in the bits buffer
return msgCnt;
} // extractFrames
// ====================================================================
//
// ====================================================================
short POCSAGProcessor::getBit()
{
if (m_bitsEnd != m_bitsStart)
{
if (++m_bitsEnd >= BIT_BUF_SIZE)
{
m_bitsEnd = 0;
}
return m_bits[m_bitsEnd];
}
else
{
return -1;
}
}
// ====================================================================
//
// ====================================================================
int POCSAGProcessor::getNoOfBits()
{
int bits = m_bitsEnd - m_bitsStart;
if (bits < 0) { bits += BIT_BUF_SIZE; }
return bits;
}
// ====================================================================
//
// ====================================================================
uint32_t POCSAGProcessor::getRate()
{
return ((m_samplesPerSec<<10)+512) / m_lastStableSymbolLen_1024;
}
// ====================================================================
//
// ====================================================================
int main() {
EventDispatcher event_dispatcher { std::make_unique<POCSAGProcessor>() };
event_dispatcher.run();
return 0;
}

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