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https://github.com/portapack-mayhem/mayhem-firmware.git
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b82eff51dd
Instead of copying data into and out of FIFO, passing buffer pointers between cores that are sized to match preferred/ideal SD card write size.
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
/*
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* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
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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 "stream_input.hpp"
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#include "lpc43xx_cpp.hpp"
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using namespace lpc43xx;
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StreamInput::StreamInput(CaptureConfig* const config) :
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fifo_buffers_empty { buffers_empty.data(), buffer_count_max_log2 },
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fifo_buffers_full { buffers_full.data(), buffer_count_max_log2 },
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config { config },
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data { std::make_unique<uint8_t[]>(config->write_size * config->buffer_count) }
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{
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config->fifo_buffers_empty = &fifo_buffers_empty;
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config->fifo_buffers_full = &fifo_buffers_full;
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for(size_t i=0; i<config->buffer_count; i++) {
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buffers[i] = { &(data.get()[i * config->write_size]), config->write_size };
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fifo_buffers_empty.in(&buffers[i]);
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}
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}
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size_t StreamInput::write(const void* const data, const size_t length) {
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const uint8_t* p = static_cast<const uint8_t*>(data);
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size_t written = 0;
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while( written < length ) {
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if( !active_buffer ) {
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// We need an empty buffer...
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if( !fifo_buffers_empty.out(active_buffer) ) {
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// ...but none are available. Samples were dropped.
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break;
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}
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}
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const auto remaining = length - written;
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written += active_buffer->write(&p[written], remaining);
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if( active_buffer->is_full() ) {
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if( !fifo_buffers_full.in(active_buffer) ) {
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// FIFO is fuil of buffers, there's no place for this one.
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// Bail out of the loop, and try submitting the buffer in the
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// next pass.
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// This should never happen if the number of buffers is less
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// than the capacity of the FIFO.
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break;
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}
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active_buffer = nullptr;
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creg::m4txevent::assert();
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}
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}
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config->baseband_bytes_received += length;
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config->baseband_bytes_dropped += (length - written);
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return written;
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}
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