mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 19:54:39 +00:00
144 lines
4.7 KiB
C++
144 lines
4.7 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 "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 "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_38k4_1t_19k2_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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static constexpr size_t baseband_fs = 2457600;
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BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20 };
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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::FIRC8xR16x24FS4Decim4 decim_0;
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dsp::decimate::FIRC16xR16x16Decim2 decim_1;
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dsp::matched_filter::MatchedFilter mf_38k4_1t_19k2 { rect_taps_307k2_38k4_1t_19k2_p, 8 };
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clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery_fsk_19k2 {
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38400, 19200, { 0.0555f },
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[this](const float raw_symbol) {
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const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
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this->packet_builder_fsk_19k2_schrader.execute(sliced_symbol);
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}
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};
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PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_fsk_19k2_schrader {
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{ 0b010101010101010101010101010110, 30, 1 },
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{ },
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{ 160 },
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[this](const baseband::Packet& packet) {
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const TPMSPacketMessage message { tpms::SignalType::FSK_19k2_Schrader, packet };
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shared_memory.application_queue.push(message);
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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 { channel_sample_rate / 8400 + 1};
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uint32_t slicer_history { 0 };
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OOKClockRecovery clock_recovery_ook_8k192 {
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channel_sample_rate / 8192.0f
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};
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PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_ook_8k192_schrader {
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/* Preamble: 11*2, 01*14, 11, 10
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* Payload: 37 Manchester-encoded bits
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* Bit rate: 4096 Hz
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*/
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{ 0b010101010101010101011110, 24, 0 },
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{ },
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{ 37 * 2 },
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[](const baseband::Packet& packet) {
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const TPMSPacketMessage message { tpms::SignalType::OOK_8k192_Schrader, packet };
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shared_memory.application_queue.push(message);
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}
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};
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OOKClockRecovery clock_recovery_ook_8k4 {
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channel_sample_rate / 8400.0f
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};
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PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_ook_8k4_schrader {
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/* Preamble: 01*40, 01, 10, 01, 01
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* Payload: 76 Manchester-encoded bits
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* Bit rate: 4200 Hz
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*/
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{ 0b01010101010101010101010101100101, 32, 0 },
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{ },
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{ 76 * 2 },
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[](const baseband::Packet& packet) {
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const TPMSPacketMessage message { tpms::SignalType::OOK_8k4_Schrader, packet };
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shared_memory.application_queue.push(message);
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}
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};
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};
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#endif/*__PROC_TPMS_H__*/
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