portapack-mayhem/firmware/baseband/proc_fsk.cpp

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/*
* Copyright (C) 2014 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_fsk.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void FSKProcessor::execute(const buffer_c8_t& buffer) {
int8_t re, im;
// This is called at 2.28M/2048 = 1113Hz
if (!configured) return;
for (size_t i = 0; i < buffer.count; i++) {
if (sample_count >= samples_per_bit) {
if (bit_pos > length) {
// End of data
cur_bit = 0;
txdone_message.done = true;
shared_memory.application_queue.push(txdone_message);
configured = false;
} else {
cur_bit = (shared_memory.bb_data.data[bit_pos >> 3] << (bit_pos & 7)) & 0x80;
bit_pos++;
if (progress_count >= progress_notice) {
progress_count = 0;
txdone_message.progress++;
shared_memory.application_queue.push(txdone_message);
} else {
progress_count++;
}
}
sample_count = 0;
} else {
sample_count++;
}
if (configured) {
if (cur_bit)
phase += shift_one;
else
phase += shift_zero;
sphase = phase + (64 << 24);
re = (sine_table_i8[(sphase & 0xFF000000) >> 24]);
im = (sine_table_i8[(phase & 0xFF000000) >> 24]);
} else {
re = 0;
im = 0;
}
buffer.p[i] = {re, im};
}
}
void FSKProcessor::on_message(const Message* const p) {
const auto message = *reinterpret_cast<const FSKConfigureMessage*>(p);
if (message.id == Message::ID::FSKConfigure) {
samples_per_bit = message.samples_per_bit;
length = message.stream_length + 4; // Why 4 ?!
shift_zero = message.shift * (0xFFFFFFFFULL / 2280000);
shift_one = -shift_zero;
progress_notice = message.progress_notice;
sample_count = samples_per_bit;
progress_count = 0;
bit_pos = 0;
cur_bit = 0;
txdone_message.progress = 0;
txdone_message.done = false;
configured = true;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<FSKProcessor>() };
event_dispatcher.run();
return 0;
}