HackRF-Treasure-Chest/Software/portapack-mayhem/firmware/baseband/stream_output.cpp

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2022-09-22 18:26:57 +02:00
/*
* Copyright (C) 2016 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 "stream_output.hpp"
#include "lpc43xx_cpp.hpp"
using namespace lpc43xx;
StreamOutput::StreamOutput(ReplayConfig* const config) :
fifo_buffers_empty { buffers_empty.data(), buffer_count_max_log2 },
fifo_buffers_full { buffers_full.data(), buffer_count_max_log2 },
config { config },
data { std::make_unique<uint8_t[]>(config->read_size * config->buffer_count) }
{
config->fifo_buffers_empty = &fifo_buffers_empty;
config->fifo_buffers_full = &fifo_buffers_full;
for(size_t i=0; i<config->buffer_count; i++) {
// Set buffers to point consecutively in previously allocated unique_ptr "data"
buffers[i] = { &(data.get()[i * config->read_size]), config->read_size };
// Put all buffer pointers in the "empty buffer" FIFO
fifo_buffers_empty.in(&buffers[i]);
}
}
size_t StreamOutput::read(void* const data, const size_t length) {
uint8_t* p = static_cast<uint8_t*>(data);
size_t read = 0;
while( read < length ) {
if( !active_buffer ) {
// We need a full buffer...
if( !fifo_buffers_full.out(active_buffer) ) {
// ...but none are available. Hole in transmission (inform app and stop ?)
break;
}
}
const auto remaining = length - read;
read += active_buffer->read(&p[read], remaining);
if( active_buffer->is_empty() ) {
if( !fifo_buffers_empty.in(active_buffer) ) {
// Empty buffers FIFO is already full.
// This should never happen if the number of buffers is less
// than the capacity of the FIFO.
break;
}
// Tell M0 (IRQ) that a buffer has been consumed.
active_buffer = nullptr;
creg::m4txevent::assert_event();
}
}
config->baseband_bytes_received += length;
return read;
}