mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-10-01 01:26:06 -04:00
9f6c495fef
Right now, 2FSK, 19200 baud, +/-38400Hz deviation. No effort is made to check CRC/checksums or decode packets.
92 lines
2.8 KiB
C++
92 lines
2.8 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 "message.hpp"
|
|
|
|
#include <cstdint>
|
|
#include <cstddef>
|
|
#include <bitset>
|
|
|
|
struct NeverMatch {
|
|
bool operator()(const BitHistory&, const size_t) const {
|
|
return false;
|
|
}
|
|
};
|
|
|
|
struct FixedLength {
|
|
bool operator()(const BitHistory&, const size_t symbols_received) const {
|
|
return symbols_received >= length;
|
|
}
|
|
|
|
const size_t length;
|
|
};
|
|
|
|
// 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:
|
|
using payload_t = std::bitset<1024>;
|
|
|
|
void execute(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 payload_t& payload, const size_t bits_received) {
|
|
this->payload_handler(payload, bits_received);
|
|
}
|
|
};
|
|
|
|
void consume_symbol(const float symbol);
|
|
void payload_handler(const payload_t& payload, const size_t bits_received);
|
|
};
|
|
|
|
#endif/*__PROC_TPMS_H__*/
|