portapack-mayhem/firmware/baseband/proc_ert.hpp
2016-01-31 09:34:24 +01:00

106 lines
3.3 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_ERT_H__
#define __PROC_ERT_H__
#include "baseband_processor.hpp"
#include "channel_decimator.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>
// ''.join(['%d%d' % (c, 1-c) for c in map(int, bin(0x1f2a60)[2:].zfill(21))])
constexpr uint64_t scm_preamble_and_sync_manchester { 0b101010101001011001100110010110100101010101 };
constexpr size_t scm_preamble_and_sync_length { 42 - 10 };
constexpr size_t scm_payload_length_max { 150 };
// ''.join(['%d%d' % (c, 1-c) for c in map(int, bin(0x555516a3)[2:].zfill(32))])
constexpr uint64_t idm_preamble_and_sync_manchester { 0b0110011001100110011001100110011001010110011010011001100101011010 };
constexpr size_t idm_preamble_and_sync_length { 64 - 16 };
constexpr size_t idm_payload_length_max { 1408 };
class ERTProcessor : public BasebandProcessor {
public:
void execute(const buffer_c8_t& buffer) override;
private:
const uint32_t baseband_sampling_rate = 4194304;
const size_t decimation = 1;
const float symbol_rate = 32768;
const uint32_t channel_sampling_rate = baseband_sampling_rate / decimation;
const size_t samples_per_symbol = channel_sampling_rate / symbol_rate;
const float clock_recovery_rate = symbol_rate * 2;
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
clock_recovery_rate, symbol_rate, { 1.0f / 18.0f },
[this](const float symbol) { this->consume_symbol(symbol); }
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> scm_builder {
{ scm_preamble_and_sync_manchester, scm_preamble_and_sync_length, 1 },
{ },
{ scm_payload_length_max },
[this](const baseband::Packet& packet) {
this->scm_handler(packet);
}
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> idm_builder {
{ idm_preamble_and_sync_manchester, idm_preamble_and_sync_length, 1 },
{ },
{ idm_payload_length_max },
[this](const baseband::Packet& packet) {
this->idm_handler(packet);
}
};
void consume_symbol(const float symbol);
void scm_handler(const baseband::Packet& packet);
void idm_handler(const baseband::Packet& packet);
float sum_half_period[2];
float sum_period[3];
float manchester[3];
const size_t average_window { 2048 };
int32_t average_i { 0 };
int32_t average_q { 0 };
size_t average_count { 0 };
float offset_i { 0.0f };
float offset_q { 0.0f };
float abs(const complex8_t& v);
};
#endif/*__PROC_ERT_H__*/