mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 11:44:31 +00:00
e85503cd81
Apparently, Subaru and GMC. No CRC or other validation, no attempt to interpret packet contents yet.
126 lines
4.0 KiB
C++
126 lines
4.0 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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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_TPMS_H__
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#define __PROC_TPMS_H__
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#include "baseband_processor.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 "ook.hpp"
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#include "message.hpp"
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#include "portapack_shared_memory.hpp"
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#include <cstdint>
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#include <cstddef>
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#include <bitset>
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// Translate+rectangular filter
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// sample=307.2k, deviation=38400, symbol=19200
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// Length: 16 taps, 1 symbols, 2 cycles of sinusoid
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constexpr std::array<std::complex<float>, 16> rect_taps_307k2_1t_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 TPMSProcessor : public BasebandProcessor {
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public:
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TPMSProcessor();
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void execute(const buffer_c8_t& buffer) override;
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private:
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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::FIRC8xR16x24FS4Decim4 decim_0;
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dsp::decimate::FIRC16xR16x16Decim2 decim_1;
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dsp::matched_filter::MatchedFilter mf { rect_taps_307k2_1t_p, 8 };
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clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
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38400, 19200, { 0.0555f },
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[this](const float symbol) { this->consume_symbol(symbol); }
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};
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PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder {
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{ 0b010101010101010101010101010110, 30, 1 },
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{ },
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{ 256 },
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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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static constexpr float channel_rate_in = 307200.0f;
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static constexpr size_t channel_decimation = 8;
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static constexpr float channel_sample_rate = channel_rate_in / channel_decimation;
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OOKSlicerMagSquaredInt ook_slicer_5sps { 5 };
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uint32_t slicer_history { 0 };
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OOKClockRecovery ook_clock_recovery_subaru {
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channel_sample_rate / 8192.0f
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};
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PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_ook_subaru {
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{ 0b010101010101010101011110, 24, 0 },
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{ },
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{ 80 },
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[](const baseband::Packet& packet) {
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const TPMSPacketMessage message { tpms::SignalType::Subaru, packet };
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shared_memory.application_queue.push(message);
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}
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};
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OOKClockRecovery ook_clock_recovery_gmc {
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channel_sample_rate / 8400.0f
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};
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PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_ook_gmc {
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{ 0b01010101010101010101010101100101, 32, 0 },
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{ },
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{ 192 },
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[](const baseband::Packet& packet) {
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const TPMSPacketMessage message { tpms::SignalType::GMC, packet };
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shared_memory.application_queue.push(message);
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}
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};
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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_TPMS_H__*/
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