portapack-mayhem/firmware/baseband/proc_audiotx.cpp
furrtek 446efa8fc0 Reduced audio tx FIFO refill size
Last received POCSAG address is auto loaded in POCSAG tx
2017-03-05 15:37:56 +00:00

108 lines
2.8 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_audiotx.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
//#include "audio_output.hpp"
#include "event_m4.hpp"
#include <cstdint>
void AudioTXProcessor::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++) {
// Audio preview sample generation @ 1536000/divider
if (!as) {
as = divider;
audio_fifo.out(out_sample);
sample = (int32_t)out_sample;
//preview_audio_buffer.p[ai++] = sample << 8;
if ((audio_fifo.len() < 512) && (asked == false)) {
// Ask application to fill up fifo
sigmessage.signaltype = 1;
shared_memory.application_queue.push(sigmessage);
asked = true;
}
} else {
as--;
}
if (ctcss_enabled) {
ctcss_sample = sine_table_i8[(ctcss_phase & 0xFF000000U) >> 24];
sample_mixed = ((sample * 217) + (ctcss_sample * 38)) / 256; // ~15%
ctcss_phase += ctcss_phase_inc;
} else {
sample_mixed = sample;
}
// FM
delta = sample_mixed * fm_delta;
phase += delta;
sphase = phase + (64 << 24);
re = (sine_table_i8[(sphase & 0xFF000000U) >> 24]);
im = (sine_table_i8[(phase & 0xFF000000U) >> 24]);
buffer.p[i] = {re, im};
}
//AudioOutput::fill_audio_buffer(preview_audio_buffer, true);
}
void AudioTXProcessor::on_message(const Message* const msg) {
const auto message = *reinterpret_cast<const AudioTXConfigMessage*>(msg);
switch(msg->id) {
case Message::ID::AudioTXConfig:
fm_delta = message.fm_delta * (0xFFFFFFULL / 1536000);
divider = message.divider;
ctcss_enabled = message.ctcss_enabled;
ctcss_phase_inc = message.ctcss_phase_inc;
as = 0;
configured = true;
break;
case Message::ID::FIFOData:
audio_fifo.in(static_cast<const FIFODataMessage*>(msg)->data, 512);
asked = false;
break;
default:
break;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<AudioTXProcessor>() };
event_dispatcher.run();
return 0;
}