portapack-mayhem/firmware/baseband/proc_btlerx.hpp

/*
 * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2016 Furrtek
 * Copyright (C) 2020 Shao
 *
 * 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_BTLERX_H__
#define __PROC_BTLERX_H__

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

#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"

#include "audio_output.hpp"

#include "fifo.hpp"
#include "message.hpp"

class BTLERxProcessor : public BasebandProcessor {
   public:
    void execute(const buffer_c8_t& buffer) override;
    void on_message(const Message* const message) override;

   private:
    static constexpr size_t baseband_fs = 4000000;
    static constexpr size_t audio_fs = baseband_fs / 8 / 8 / 2;

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

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

    const buffer_s16_t work_audio_buffer{
        (int16_t*)dst.data(),
        sizeof(dst) / sizeof(int16_t)};

    // Array size ok down to 375 bauds (24000 / 375)
    std::array<int32_t, 64> delay_line{0};
    std::array<int16_t, 1000> rb_buf{0};

    /*dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
        dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
        dsp::decimate::FIRAndDecimateComplex channel_filter { };*/
    dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0{};
    dsp::decimate::FIRC16xR16x16Decim2 decim_1{};

    dsp::demodulate::FM demod{};
    int rb_head{-1};
    int32_t g_threshold{0};
    uint8_t channel_number{38};
    int skipSamples{1000};
    int RB_SIZE{1000};

    bool configured{false};
    AFSKDataMessage data_message{false, 0};

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

    void configure(const BTLERxConfigureMessage& message);
};

#endif /*__PROC_BTLERX_H__*/