portapack-mayhem/firmware/baseband/proc_ais.cpp

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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 "i2s.hpp"
using namespace lpc43xx;
void AISProcessor::execute(buffer_c8_t buffer) {
/* 2.4576MHz, 2048 samples */
auto decimator_out = decimator.execute(buffer);
/* 76.8kHz, 64 samples */
feed_channel_stats(decimator_out);
/* No spectrum display while AIS decoding.
feed_channel_spectrum(
channel,
decimator_out.sampling_rate * channel_filter_taps.pass_frequency_normalized,
decimator_out.sampling_rate * channel_filter_taps.stop_frequency_normalized
);
*/
for(size_t i=0; i<decimator_out.count; i++) {
// TODO: No idea why implicit cast int16_t->float is not allowed.
const std::complex<float> sample {
static_cast<float>(decimator_out.p[i].real()),
static_cast<float>(decimator_out.p[i].imag())
};
if( mf.execute_once(sample) ) {
clock_recovery(mf.get_output());
}
}
i2s::i2s0::tx_mute();
}
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 std::bitset<1024>& payload,
const size_t bits_received
) {
AISPacketMessage message;
message.packet.payload = payload;
message.packet.bits_received = bits_received;
shared_memory.application_queue.push(message);
}