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