mayhem-firmware/firmware/baseband/proc_xylos.cpp
furrtek 38e506a108 OOK transmit is mostly working, bit durations are wrong
Simplified messages carrying data (uses shared_memory instead)
Added SymField widget (bitfield, symbol field...)
Added some space for baseband code
BMP palette loading bugfix
2016-08-06 08:49:45 +02:00

123 lines
3.1 KiB
C++

/*
* 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_xylos.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void XylosProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 1536000/2048 = 750Hz
if (!configured) return;
for (size_t i = 0; i<buffer.count; i++) {
// Tone generation at 1536000/5 = 307.2kHz
if (s >= (5 - 1)) {
s = 0;
if (silence) {
// Just occupy channel with carrier
if (sample_count >= CCIR_SILENCE) {
silence = false;
sample_count = samples_per_tone;
} else {
sample_count++;
}
} else {
if (sample_count >= samples_per_tone) {
digit = shared_memory.tx_data[byte_pos++];
if ((digit == 0xFF) || (byte_pos >= 21)) {
configured = false;
message.n = 25; // End of message code
shared_memory.application_queue.push(message);
} else {
message.n = byte_pos; // Inform UI about progress (just as eye candy)
shared_memory.application_queue.push(message);
}
sample_count = 0;
} else {
sample_count++;
}
tone_phase += ccir_phases[digit];
}
} else {
s++;
}
if (silence) {
re = 0;
im = 0;
} else {
tone_sample = (sine_table_i8[(tone_phase & 0x03FC0000)>>18]);
// Audio preview sample generation: 1536000/48000 = 32
/*if (as >= 31) {
as = 0;
audio[ai++] = sample * 128;
} else {
as++;
}*/
// FM
// 1<<18 = 262144
// m = (262144 * BW) / 1536000 / 2
frq = tone_sample * 853; // 10kHz BW
phase = (phase + frq);
sphase = phase + (64<<18);
re = (sine_table_i8[(sphase & 0x03FC0000)>>18]);
im = (sine_table_i8[(phase & 0x03FC0000)>>18]);
}
buffer.p[i] = {(int8_t)re,(int8_t)im};
}
//audio_output.write(audio_buffer);
}
void XylosProcessor::on_message(const Message* const p) {
const auto message = *reinterpret_cast<const CCIRConfigureMessage*>(p);
if (message.id == Message::ID::CCIRConfigure) {
byte_pos = 0;
digit = 0;
samples_per_tone = message.samples_per_tone;
sample_count = samples_per_tone;
as = 0;
silence = true;
configured = true;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<XylosProcessor>() };
event_dispatcher.run();
return 0;
}