portapack-mayhem/firmware/baseband/proc_adsbrx.hpp

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2017 Furrtek
*
* 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_ADSBRX_H__
#define __PROC_ADSBRX_H__
#include "baseband_processor.hpp"
#include "baseband_thread.hpp"
#include "adsb_frame.hpp"
using namespace adsb;
#define ADSB_PREAMBLE_LENGTH 16
class ADSBRXProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const message) override;
private:
static constexpr float k = 1.0f / 128.0f;
static constexpr size_t baseband_fs = 2000000;
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
ADSBFrame frame { };
bool configured { false };
float prev_mag { 0 };
float threshold, threshold_low, threshold_high;
size_t null_count, bit_count, sample_count;
std::pair<float, uint8_t> shifter[ADSB_PREAMBLE_LENGTH];
bool decoding { };
bool preamble { }, active { };
uint16_t bit_pos { 0 };
uint8_t cur_bit { 0 };
uint32_t sample { 0 };
int8_t re { }, im { };
};
#endif