mayhem-firmware/firmware/baseband/proc_ais.hpp

/*
 * 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.
 */

#ifndef __PROC_AIS_H__
#define __PROC_AIS_H__

#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "rssi_thread.hpp"

#include "channel_decimator.hpp"
#include "matched_filter.hpp"

#include "clock_recovery.hpp"
#include "symbol_coding.hpp"
#include "packet_builder.hpp"
#include "baseband_packet.hpp"

#include "message.hpp"

#include <cstdint>
#include <cstddef>
#include <bitset>

#include "ais_baseband.hpp"

class AISProcessor : public BasebandProcessor {
   public:
    AISProcessor();

    void execute(const buffer_c8_t& buffer) override;

   private:
    static constexpr size_t baseband_fs = 2457600;

    std::array<complex16_t, 512> dst{};
    const buffer_c16_t dst_buffer{
        dst.data(),
        dst.size()};

    dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0{};
    dsp::decimate::FIRC16xR16x32Decim8 decim_1{};
    dsp::matched_filter::MatchedFilter mf{baseband::ais::square_taps_38k4_1t_p, 2};

    clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery{
        19200,
        9600,
        {0.0555f},
        [this](const float symbol) { this->consume_symbol(symbol); }};
    symbol_coding::NRZIDecoder nrzi_decode{};
    PacketBuilder<BitPattern, BitPattern, BitPattern> packet_builder{
        {0b0101010101111110, 16, 1},
        {0b111110, 6},
        {0b01111110, 8},
        [this](const baseband::Packet& packet) {
            this->payload_handler(packet);
        }};

    /* NB: Threads should be the last members in the class definition. */
    BasebandThread baseband_thread{
        baseband_fs, this, baseband::Direction::Receive, /*auto_start*/ false};
    RSSIThread rssi_thread{};

    void consume_symbol(const float symbol);
    void payload_handler(const baseband::Packet& packet);
};

#endif /*__PROC_AIS_H__*/