mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-14 20:18:13 +00:00
112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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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_rds.hpp"
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#include "portapack_shared_memory.hpp"
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#include "sine_table_int8.hpp"
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#include "event_m4.hpp"
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#include <cstdint>
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void RDSProcessor::execute(const buffer_c8_t& buffer) {
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for (size_t i = 0; i < buffer.count; i++) {
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// Sample generation at 2.28M / 10 = 228kHz
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if (s >= 9) {
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s = 0;
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if (sample_count >= SAMPLES_PER_BIT) {
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if (bit_pos >= message_length) {
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bit_pos = 0;
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cur_output = 0;
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}
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cur_bit = (rdsdata[(bit_pos / 26) & 15] >> (25 - (bit_pos % 26))) & 1;
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prev_output = cur_output;
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cur_output = prev_output ^ cur_bit;
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const int32_t * src = waveform_biphase;
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int idx = in_sample_index;
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for (int j = 0; j < FILTER_SIZE; j++) {
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val = (*src++);
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if (cur_output) val = -val;
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sample_buffer[idx++] += val;
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if (idx >= SAMPLE_BUFFER_SIZE) idx = 0;
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}
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in_sample_index += SAMPLES_PER_BIT;
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if (in_sample_index >= SAMPLE_BUFFER_SIZE) in_sample_index -= SAMPLE_BUFFER_SIZE;
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bit_pos++;
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sample_count = 0;
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}
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sample = sample_buffer[out_sample_index];
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sample_buffer[out_sample_index] = 0;
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out_sample_index++;
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if (out_sample_index >= SAMPLE_BUFFER_SIZE) out_sample_index = 0;
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// AM @ 228k/4 = 57kHz
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// 0, sample, 0, -sample...
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switch (mphase & 3) {
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case 0:
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case 2: sample = 0; break;
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case 1: break;
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case 3: sample = -sample; // break;
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}
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mphase++;
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sample_count++;
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} else {
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s++;
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}
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// FM
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delta = (sample >> 16) * 386760; // ?
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phase += delta;
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sphase = phase + (64 << 18);
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re = (sine_table_i8[(sphase & 0x03FF0000) >> 18]);
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im = (sine_table_i8[(phase & 0x03FF0000) >> 18]);
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buffer.p[i] = {(int8_t)re, (int8_t)im};
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}
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}
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void RDSProcessor::on_message(const Message* const msg) {
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if (msg->id == Message::ID::RDSConfigure) {
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const auto message = *reinterpret_cast<const RDSConfigureMessage*>(msg);
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rdsdata = (uint32_t*)shared_memory.tx_data;
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message_length = message.length;
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configured = true;
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}
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}
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int main() {
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EventDispatcher event_dispatcher { std::make_unique<RDSProcessor>() };
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event_dispatcher.run();
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return 0;
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}
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