mayhem-firmware/firmware/baseband-tx/proc_xylos.cpp

97 lines
2.4 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 "dsp_iir_config.hpp"
//#include "audio_output.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table.hpp"
#include <cstdint>
// 1990 1131 1201 1275 1357 ...
// 14 13 12 11:
// 2108 989 2259 931
void XylosProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 1536000/2048 = 750Hz
ai = 0;
for (size_t i = 0; i<buffer.count; i++) {
// Sample generation rate: 1536000/10 = 153kHz
if (s >= 9) {
s = 0;
if (sample_count >= CCIR_TONELENGTH) {
if (shared_memory.xylos_transmit_done == false) {
message.n = byte_pos; // Inform UI about progress (just as eye candy)
shared_memory.application_queue.push(message);
digit = shared_memory.xylosdata[byte_pos++];
}
if (digit == 0xFF) {
message.n = 25; // End of message code
shared_memory.xylos_transmit_done = true;
shared_memory.application_queue.push(message);
}
sample_count = 0;
} else {
sample_count++;
}
aphase += ccir_phases[digit];
} else {
s++;
}
sample = (sine_table_f32[(aphase & 0x03FF0000)>>18]*255);
// Audio preview sample generation: 1536000/48000 = 32
if (as >= 31) {
as = 0;
preview_audio_buffer.p[ai++] = sample * 128;
} else {
as++;
}
//FM
frq = sample * 300; // ~10kHz wide
phase = (phase + frq);
sphase = phase + (256<<16);
re = (sine_table_f32[(sphase & 0x03FF0000)>>18]*127);
im = (sine_table_f32[(phase & 0x03FF0000)>>18]*127);
buffer.p[i] = {(int8_t)re,(int8_t)im};
}
//audio_output.write(preview_audio_buffer);
}