mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-14 20:18:13 +00:00
118 lines
3.3 KiB
C++
118 lines
3.3 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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#include "proc_ert.hpp"
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#include "portapack_shared_memory.hpp"
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#include "i2s.hpp"
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using namespace lpc43xx;
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float ERTProcessor::abs(const complex8_t& v) {
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// const int16_t r = v.real() - offset_i;
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// const int16_t i = v.imag() - offset_q;
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// const uint32_t r2 = r * r;
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// const uint32_t i2 = i * i;
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// const uint32_t r2_i2 = r2 + i2;
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// return std::sqrt(static_cast<float>(r2_i2));
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const float r = static_cast<float>(v.real()) - offset_i;
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const float i = static_cast<float>(v.imag()) - offset_q;
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const float r2 = r * r;
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const float i2 = i * i;
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const float r2_i2 = r2 + i2;
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return std::sqrt(r2_i2);
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}
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void ERTProcessor::execute(buffer_c8_t buffer) {
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/* 4.194304MHz, 2048 samples */
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// auto decimator_out = decimator.execute(buffer);
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const complex8_t* src = &buffer.p[0];
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const complex8_t* const src_end = &buffer.p[buffer.count];
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average_i += src->real();
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average_q += src->imag();
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average_count++;
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if( average_count == average_window ) {
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offset_i = static_cast<float>(average_i) / average_window;
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offset_q = static_cast<float>(average_q) / average_window;
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average_i = 0;
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average_q = 0;
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average_count = 0;
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}
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const float gain = 128 * samples_per_symbol;
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const float k = 1.0f / gain;
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while(src < src_end) {
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float sum = 0.0f;
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for(size_t i=0; i<(samples_per_symbol / 2); i++) {
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sum += abs(*(src++));
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}
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sum_half_period[1] = sum_half_period[0];
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sum_half_period[0] = sum;
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sum_period[2] = sum_period[1];
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sum_period[1] = sum_period[0];
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sum_period[0] = (sum_half_period[0] + sum_half_period[1]) * k;
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manchester[2] = manchester[1];
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manchester[1] = manchester[0];
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manchester[0] = sum_period[2] - sum_period[0];
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const auto data = manchester[0] - manchester[2];
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clock_recovery(data);
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}
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i2s::i2s0::tx_mute();
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}
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void ERTProcessor::consume_symbol(
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const float raw_symbol
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) {
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const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
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scm_builder.execute(sliced_symbol);
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idm_builder.execute(sliced_symbol);
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}
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void ERTProcessor::scm_handler(
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const std::bitset<1024>& payload,
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const size_t bits_received
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) {
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ERTPacketMessage message;
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message.packet.type = ERTPacket::Type::SCM;
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message.packet.payload = payload;
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message.packet.bits_received = bits_received;
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shared_memory.application_queue.push(message);
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}
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void ERTProcessor::idm_handler(
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const std::bitset<1024>& payload,
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const size_t bits_received
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) {
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ERTPacketMessage message;
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message.packet.type = ERTPacket::Type::IDM;
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message.packet.payload = payload;
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message.packet.bits_received = bits_received;
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shared_memory.application_queue.push(message);
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}
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