mayhem-firmware/firmware/baseband/proc_ook.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_ook.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void OOKProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 2.28M/2048 = 1113Hz
if (!configured) return;
for (size_t i = 0; i<buffer.count; i++) {
// Synthesis at 2.28M/10 = 228kHz
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if (!s) {
s = 10 - 1;
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if (sample_count >= samples_per_bit) {
if (configured) {
if (bit_pos >= length) {
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// End of data
if (pause_counter == 0) {
pause_counter = pause;
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cur_bit = 0;
} else if (pause_counter == 1) {
if (repeat_counter < repeat) {
// Repeat
bit_pos = 0;
cur_bit = shared_memory.bb_data.data[0] & 0x80;
txdone_message.progress = repeat_counter + 1;
shared_memory.application_queue.push(txdone_message);
repeat_counter++;
} else {
// Stop
cur_bit = 0;
txdone_message.done = true;
shared_memory.application_queue.push(txdone_message);
configured = false;
}
pause_counter = 0;
} else {
pause_counter--;
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}
} else {
cur_bit = (shared_memory.bb_data.data[bit_pos >> 3] << (bit_pos & 7)) & 0x80;
bit_pos++;
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}
}
sample_count = 0;
} else {
sample_count++;
}
} else {
s--;
}
if (cur_bit) {
phase = (phase + 200); // What ?
sphase = phase + (64 << 18);
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re = (sine_table_i8[(sphase & 0x03FC0000) >> 18]);
im = (sine_table_i8[(phase & 0x03FC0000) >> 18]);
} else {
re = 0;
im = 0;
}
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buffer.p[i] = {(int8_t)re, (int8_t)im};
}
}
void OOKProcessor::on_message(const Message* const p) {
const auto message = *reinterpret_cast<const OOKConfigureMessage*>(p);
if (message.id == Message::ID::OOKConfigure) {
samples_per_bit = message.samples_per_bit;
repeat = message.repeat - 1;
length = message.stream_length - 1;
pause = message.pause_symbols + 1;
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pause_counter = 0;
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s = 0;
sample_count = samples_per_bit;
repeat_counter = 0;
bit_pos = 0;
cur_bit = 0;
txdone_message.progress = 0;
txdone_message.done = false;
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configured = true;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<OOKProcessor>() };
event_dispatcher.run();
return 0;
}