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https://github.com/portapack-mayhem/mayhem-firmware.git
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609235b19f
Simplified audio spectrum computation and transfer ACARS RX in debug mode Disabled ABI warnings Updated binary
139 lines
4.2 KiB
C++
139 lines
4.2 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2018 Furrtek
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __PROC_ACARS_H__
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#define __PROC_ACARS_H__
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#include "baseband_processor.hpp"
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#include "baseband_thread.hpp"
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#include "rssi_thread.hpp"
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#include "dsp_decimate.hpp"
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#include "spectrum_collector.hpp"
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#include <cstdint>
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#include "baseband_processor.hpp"
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#include "baseband_thread.hpp"
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#include "rssi_thread.hpp"
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#include "channel_decimator.hpp"
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#include "matched_filter.hpp"
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#include "clock_recovery.hpp"
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#include "symbol_coding.hpp"
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#include "packet_builder.hpp"
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#include "baseband_packet.hpp"
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#include "message.hpp"
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#include <cstdint>
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#include <cstddef>
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#include <bitset>
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// AIS:
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// IN: 2457600/8/8 = 38400
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// Offset: 2457600/4 = 614400 (614400/8/8 = 9600)
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// Deviation: 2400
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// Symbol: 9600
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// Decimate: 2
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// 4 taps, 1 symbol, 1/4 cycle
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// TPMS:
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// IN: 2457600/4/2 = 307200
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// Offset: 2457600/4 = 614400 (614400/4/2 = 76800)
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// Deviation: 38400
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// Symbol: 19200
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// Decimate: 8
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// 16 taps, 1 symbol, 2 cycles
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// ACARS:
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// IN: 2457600/8/8 = 38400
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// Offset: 2457600/4 = 614400 (614400/8/8 = 9600)
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// Deviation: ???
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// Symbol: 2400
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// Decimate: 8
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// 16 taps, 1 symbol, 2 cycles
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// Number of taps: size of one symbol in samples (in/symbol)
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// Cycles:
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// Translate+rectangular filter
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// sample=38.4k, deviation=4800, symbol=2400
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// Length: 16 taps, 1 symbol, 2 cycles of sinusoid
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// This is actually the same as rect_taps_307k2_38k4_1t_19k2_p
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constexpr std::array<std::complex<float>, 16> rect_taps_38k4_4k8_1t_2k4_p { {
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{ 6.2500000000e-02f, 0.0000000000e+00f }, { 4.4194173824e-02f, 4.4194173824e-02f },
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{ 0.0000000000e+00f, 6.2500000000e-02f }, { -4.4194173824e-02f, 4.4194173824e-02f },
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{ -6.2500000000e-02f, 0.0000000000e+00f }, { -4.4194173824e-02f, -4.4194173824e-02f },
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{ 0.0000000000e+00f, -6.2500000000e-02f }, { 4.4194173824e-02f, -4.4194173824e-02f },
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{ 6.2500000000e-02f, 0.0000000000e+00f }, { 4.4194173824e-02f, 4.4194173824e-02f },
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{ 0.0000000000e+00f, 6.2500000000e-02f }, { -4.4194173824e-02f, 4.4194173824e-02f },
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{ -6.2500000000e-02f, 0.0000000000e+00f }, { -4.4194173824e-02f, -4.4194173824e-02f },
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{ 0.0000000000e+00f, -6.2500000000e-02f }, { 4.4194173824e-02f, -4.4194173824e-02f },
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} };
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class ACARSProcessor : public BasebandProcessor {
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public:
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ACARSProcessor();
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void execute(const buffer_c8_t& buffer) override;
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private:
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static constexpr size_t baseband_fs = 2457600;
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BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
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RSSIThread rssi_thread { NORMALPRIO + 10 };
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std::array<complex16_t, 512> dst { };
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const buffer_c16_t dst_buffer {
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dst.data(),
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dst.size()
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};
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dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { }; // Translate already done here !
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dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
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dsp::matched_filter::MatchedFilter mf { rect_taps_38k4_4k8_1t_2k4_p, 8 };
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clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
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4800, 2400, { 0.0555f },
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[this](const float symbol) { this->consume_symbol(symbol); }
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};
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symbol_coding::ACARSDecoder acars_decode { };
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/*PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder {
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{ 0b011010000110100010000000, 24, 1 }, // SYN, SYN, SOH
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{ },
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{ 128 },
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[this](const baseband::Packet& packet) {
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this->payload_handler(packet);
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}
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};*/
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baseband::Packet packet { };
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void consume_symbol(const float symbol);
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void payload_handler(const baseband::Packet& packet);
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};
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#endif/*__PROC_ACARS_H__*/
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