mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-10-01 01:26:06 -04:00
111 lines
3.1 KiB
C++
111 lines
3.1 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.
|
|
*/
|
|
|
|
#include "proc_ert.hpp"
|
|
|
|
#include "portapack_shared_memory.hpp"
|
|
|
|
#include "event_m4.hpp"
|
|
|
|
float ERTProcessor::abs(const complex8_t& v) {
|
|
// const int16_t r = v.real() - offset_i;
|
|
// const int16_t i = v.imag() - offset_q;
|
|
// const uint32_t r2 = r * r;
|
|
// const uint32_t i2 = i * i;
|
|
// const uint32_t r2_i2 = r2 + i2;
|
|
// return std::sqrt(static_cast<float>(r2_i2));
|
|
const float r = static_cast<float>(v.real()) - offset_i;
|
|
const float i = static_cast<float>(v.imag()) - offset_q;
|
|
const float r2 = r * r;
|
|
const float i2 = i * i;
|
|
const float r2_i2 = r2 + i2;
|
|
return std::sqrt(r2_i2);
|
|
}
|
|
|
|
void ERTProcessor::execute(const buffer_c8_t& buffer) {
|
|
/* 4.194304MHz, 2048 samples */
|
|
|
|
const complex8_t* src = &buffer.p[0];
|
|
const complex8_t* const src_end = &buffer.p[buffer.count];
|
|
|
|
average_i += src->real();
|
|
average_q += src->imag();
|
|
average_count++;
|
|
if( average_count == average_window ) {
|
|
offset_i = static_cast<float>(average_i) / average_window;
|
|
offset_q = static_cast<float>(average_q) / average_window;
|
|
average_i = 0;
|
|
average_q = 0;
|
|
average_count = 0;
|
|
}
|
|
|
|
const float gain = 128 * samples_per_symbol;
|
|
const float k = 1.0f / gain;
|
|
|
|
while(src < src_end) {
|
|
float sum = 0.0f;
|
|
for(size_t i=0; i<(samples_per_symbol / 2); i++) {
|
|
sum += abs(*(src++));
|
|
}
|
|
sum_half_period[1] = sum_half_period[0];
|
|
sum_half_period[0] = sum;
|
|
|
|
sum_period[2] = sum_period[1];
|
|
sum_period[1] = sum_period[0];
|
|
sum_period[0] = (sum_half_period[0] + sum_half_period[1]) * k;
|
|
|
|
manchester[2] = manchester[1];
|
|
manchester[1] = manchester[0];
|
|
manchester[0] = sum_period[2] - sum_period[0];
|
|
|
|
const auto data = manchester[0] - manchester[2];
|
|
|
|
clock_recovery(data);
|
|
}
|
|
}
|
|
|
|
void ERTProcessor::consume_symbol(
|
|
const float raw_symbol
|
|
) {
|
|
const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
|
|
scm_builder.execute(sliced_symbol);
|
|
idm_builder.execute(sliced_symbol);
|
|
}
|
|
|
|
void ERTProcessor::scm_handler(
|
|
const baseband::Packet& packet
|
|
) {
|
|
const ERTPacketMessage message { ert::Packet::Type::SCM, packet };
|
|
shared_memory.application_queue.push(message);
|
|
}
|
|
|
|
void ERTProcessor::idm_handler(
|
|
const baseband::Packet& packet
|
|
) {
|
|
const ERTPacketMessage message { ert::Packet::Type::IDM, packet };
|
|
shared_memory.application_queue.push(message);
|
|
}
|
|
|
|
void run() {
|
|
EventDispatcher event_dispatcher { std::make_unique<ERTProcessor>() };
|
|
event_dispatcher.run();
|
|
}
|