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 "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;
}