mayhem-firmware/firmware/baseband/proc_tones.cpp

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/*
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2016 Furrtek
*
* 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_tones.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
// This is called at 1536000/2048 = 750Hz
void TonesProcessor::execute(const buffer_c8_t& buffer) {
if (!configured) return;
ai = 0;
for (size_t i = 0; i < buffer.count; i++) {
// Tone generation at full samplerate
if (silence_count) {
// Just occupy channel with carrier
silence_count--;
if (!silence_count) {
sample_count = 0;
tone_a_phase = 0;
tone_b_phase = 0;
}
tone_sample = 0;
re = 0;
im = 0;
} else {
if (!sample_count) {
digit = shared_memory.bb_data.tones_data.message[digit_pos];
if (digit_pos >= message_length) {
configured = false;
txdone_message.done = true;
shared_memory.application_queue.push(txdone_message);
return;
} else {
txdone_message.progress = digit_pos; // Inform UI about progress
shared_memory.application_queue.push(txdone_message);
}
digit_pos++;
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if (digit >= 32) { // || (tone_deltas[digit] == 0)
sample_count = shared_memory.bb_data.tones_data.silence;
} else {
if (!dual_tone) {
tone_a_delta = tone_deltas[digit];
} else {
tone_a_delta = tone_deltas[digit << 1];
tone_b_delta = tone_deltas[(digit << 1) + 1];
}
sample_count = tone_durations[digit];
}
} else {
sample_count--;
}
// Ugly
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if ((digit >= 32) || (tone_deltas[digit] == 0)) {
tone_sample = 0;
} else {
if (!dual_tone) {
tone_sample = (sine_table_i8[(tone_a_phase & 0xFF000000U) >> 24]);
tone_a_phase += tone_a_delta;
} else {
tone_sample = sine_table_i8[(tone_a_phase & 0xFF000000U) >> 24] >> 1;
tone_sample += sine_table_i8[(tone_b_phase & 0xFF000000U) >> 24] >> 1;
tone_a_phase += tone_a_delta;
tone_b_phase += tone_b_delta;
}
}
// FM
delta = tone_sample * fm_delta;
phase += delta;
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sphase = phase + (64 << 24);
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re = (sine_table_i8[(sphase & 0xFF000000U) >> 24]);
im = (sine_table_i8[(phase & 0xFF000000U) >> 24]);
}
// Headphone output sample generation: 1536000/24000 = 64
if (audio_out) {
if (!as) {
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as = 64;
audio_buffer.p[ai++] = tone_sample * 128;
} else {
as--;
}
}
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buffer.p[i] = {re, im};
}
if (audio_out) audio_output.write(audio_buffer);
}
void TonesProcessor::on_message(const Message* const p) {
const auto message = *reinterpret_cast<const TonesConfigureMessage*>(p);
if (message.id == Message::ID::TonesConfigure) {
message_length = message.tone_count;
if (message_length) {
silence_count = message.pre_silence; // In samples
for (uint8_t c = 0; c < 32; c++) {
tone_deltas[c] = shared_memory.bb_data.tones_data.tone_defs[c].delta;
tone_durations[c] = shared_memory.bb_data.tones_data.tone_defs[c].duration;
}
fm_delta = message.fm_delta * (0xFFFFFFFFULL / 1536000) * 2;
audio_out = message.audio_out;
dual_tone = message.dual_tone;
if (audio_out) audio_output.configure(false);
txdone_message.done = false;
txdone_message.progress = 0;
digit_pos = 0;
sample_count = 0;
tone_a_phase = 0;
tone_b_phase = 0;
as = 0;
configured = true;
} else {
configured = false;
txdone_message.done = true;
shared_memory.application_queue.push(txdone_message);
}
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<TonesProcessor>() };
event_dispatcher.run();
return 0;
}