mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-15 12:38:11 +00:00
148 lines
3.7 KiB
C++
148 lines
3.7 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_dtmf_tx.hpp"
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#include "portapack_shared_memory.hpp"
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#include "sine_table_int8.hpp"
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//#include "audio_output.hpp"
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#include "event_m4.hpp"
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#include <cstdint>
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void DTMFTXProcessor::execute(const buffer_c8_t& buffer){
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// This is called at 1536000/2048 = 750Hz
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// DTMF samplerate = 153600Hz
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if (!configured) return;
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for (size_t i = 0; i<buffer.count; i++) {
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if (!as) {
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as = 10;
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if (!timer) {
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if (tone) {
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tone = false;
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timer = pause_length;
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} else {
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tone = true;
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timer = tone_length;
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tone_code = shared_memory.tx_data[tone_idx];
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if (tone_code == 0xFF) {
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txdone_message.n = 0xFF; // End of list
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shared_memory.application_queue.push(txdone_message);
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configured = false;
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tone = false;
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} else {
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txdone_message.n = tone_idx; // New tone (progress)
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shared_memory.application_queue.push(txdone_message);
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tone_idx++;
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}
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}
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} else
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timer--;
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if (tone) {
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sample = sine_table_i8[(tone_a_phase & 0x03FC0000) >> 18] >> 1;
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sample += sine_table_i8[(tone_b_phase & 0x03FC0000) >> 18] >> 1;
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tone_a_phase += DTMF_LUT[tone_code][0];
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tone_b_phase += DTMF_LUT[tone_code][1];
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} else {
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sample = 0;
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}
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} else {
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as--;
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}
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// FM
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frq = sample * bw;
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phase = (phase + frq);
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sphase = phase + (64 << 18);
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re = (sine_table_i8[(sphase & 0x03FC0000) >> 18]);
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im = (sine_table_i8[(phase & 0x03FC0000) >> 18]);
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buffer.p[i] = {(int8_t)re, (int8_t)im};
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}
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//AudioOutput::fill_audio_buffer(preview_audio_buffer, true);
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}
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void DTMFTXProcessor::on_message(const Message* const msg) {
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char * tone_ptr;
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const auto message = *reinterpret_cast<const DTMFTXConfigMessage*>(msg);
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if (message.id == Message::ID::DTMFTXConfig) {
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// Translate DTMF message to index in DTMF frequencies table
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tone_ptr = &shared_memory.tx_data[0];
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for (;;) {
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tone_code = *tone_ptr;
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if (tone_code == 0xFF)
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break; // End of message
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else if (tone_code <= 9)
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// That's already fine bro.
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*tone_ptr = tone_code;
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else if (tone_code == 'A')
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*tone_ptr = 10;
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else if (tone_code == 'B')
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*tone_ptr = 11;
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else if (tone_code == 'C')
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*tone_ptr = 12;
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else if (tone_code == 'D')
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*tone_ptr = 13;
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else if (tone_code == '#')
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*tone_ptr = 14;
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else if (tone_code == '*')
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*tone_ptr = 15;
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else {
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*tone_ptr = 0xFF; // Invalid character, stop here
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}
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tone_ptr++;
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}
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// 1<<18 = 262144
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// m = (262144 * a) / 1536000
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// a = 262144 / 1536000 (*1000 = 171)
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bw = 171 * (message.bw);
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tone_length = message.tone_length * 154; // 153.6
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pause_length = message.pause_length * 154; // 153.6
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as = 0;
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tone = false;
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timer = 0;
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tone_idx = 0;
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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<DTMFTXProcessor>() };
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event_dispatcher.run();
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return 0;
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}
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