portapack-mayhem/firmware/baseband/proc_tpms.hpp

77 lines
2.5 KiB
C++

/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
*
* 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_TPMS_H__
#define __PROC_TPMS_H__
#include "baseband_processor.hpp"
#include "channel_decimator.hpp"
#include "matched_filter.hpp"
#include "clock_recovery.hpp"
#include "symbol_coding.hpp"
#include "packet_builder.hpp"
#include "baseband_packet.hpp"
#include "message.hpp"
#include <cstdint>
#include <cstddef>
#include <bitset>
// Translate+rectangular filter
// sample=153.6k, deviation=38400, symbol=19200
// Length: 8 taps, 1 symbols, 2 cycles of sinusoid
constexpr std::array<std::complex<float>, 8> rect_taps_153k6_1t_p { {
{ 1.2500000000e-01f, 0.0000000000e+00f }, { 7.6540424947e-18f, 1.2500000000e-01f },
{ -1.2500000000e-01f, 1.5308084989e-17f }, { -2.2962127484e-17f, -1.2500000000e-01f },
{ 1.2500000000e-01f, -3.0616169979e-17f }, { 3.8270212473e-17f, 1.2500000000e-01f },
{ -1.2500000000e-01f, 4.5924254968e-17f }, { -5.3578297463e-17f, -1.2500000000e-01f },
} };
class TPMSProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
private:
ChannelDecimator decimator { ChannelDecimator::DecimationFactor::By16 };
dsp::matched_filter::MatchedFilter mf { rect_taps_153k6_1t_p, 4 };
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
38400, 19200, { 0.0555f },
[this](const float symbol) { this->consume_symbol(symbol); }
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder {
{ 0b010101010101010101010101010110, 30, 1 },
{ },
{ 256 },
[this](const baseband::Packet& packet) {
this->payload_handler(packet);
}
};
void consume_symbol(const float symbol);
void payload_handler(const baseband::Packet& packet);
};
#endif/*__PROC_TPMS_H__*/