portapack-mayhem/firmware/baseband/proc_siggen.cpp

126 lines
3.2 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2017 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_siggen.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table_int8.hpp"
#include "event_m4.hpp"
#include <cstdint>
void SigGenProcessor::execute(const buffer_c8_t& buffer) {
if (!configured) return;
for (size_t i = 0; i < buffer.count; i++) {
if (!sample_count && auto_off) {
configured = false;
txprogress_message.done = true;
shared_memory.application_queue.push(txprogress_message);
} else
sample_count--;
if (tone_shape == 0) {
// CW
re = 127;
im = 0;
} else {
if (tone_shape == 1) {
// Sine
sample = (sine_table_i8[(tone_phase & 0xFF000000) >> 24]);
} else if (tone_shape == 2) {
// Tri
int8_t a = (tone_phase & 0xFF000000) >> 24;
sample = (a & 0x80) ? ((a << 1) ^ 0xFF) - 0x80 : (a << 1) + 0x80;
} else if (tone_shape == 3) {
// Saw up
sample = ((tone_phase & 0xFF000000) >> 24);
} else if (tone_shape == 4) {
// Saw down
sample = ((tone_phase & 0xFF000000) >> 24) ^ 0xFF;
} else if (tone_shape == 5) {
// Square
sample = (((tone_phase & 0xFF000000) >> 24) & 0x80) ? 127 : -128;
} else if (tone_shape == 6) {
// Noise
sample = (lfsr & 0xFF000000) >> 24;
feedback = ((lfsr >> 31) ^ (lfsr >> 29) ^ (lfsr >> 15) ^ (lfsr >> 11)) & 1;
lfsr = (lfsr << 1) | feedback;
if (!lfsr) lfsr = 0x1337; // Shouldn't do this :(
}
tone_phase += tone_delta;
// Do FM
delta = sample * fm_delta;
phase += delta;
sphase = phase + (64 << 24);
re = (sine_table_i8[(sphase & 0xFF000000) >> 24]);
im = (sine_table_i8[(phase & 0xFF000000) >> 24]);
}
buffer.p[i] = {re, im};
}
};
void SigGenProcessor::on_message(const Message* const msg) {
const auto message = *reinterpret_cast<const SigGenConfigMessage*>(msg);
switch(msg->id) {
case Message::ID::SigGenConfig:
if (!message.bw) {
configured = false;
return;
}
if (message.duration) {
sample_count = message.duration;
auto_off = true;
} else
auto_off = false;
fm_delta = message.bw * (0xFFFFFFULL / 1536000);
tone_shape = message.shape;
lfsr = 0x54DF0119;
configured = true;
break;
case Message::ID::SigGenTone:
tone_delta = reinterpret_cast<const SigGenToneMessage*>(msg)->tone_delta;
break;
default:
break;
}
}
int main() {
EventDispatcher event_dispatcher { std::make_unique<SigGenProcessor>() };
event_dispatcher.run();
return 0;
}