mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-23 08:27:44 +00:00
116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
/*
|
|
* 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_jammer.hpp"
|
|
#include "portapack_shared_memory.hpp"
|
|
#include "sine_table_int8.hpp"
|
|
#include "event_m4.hpp"
|
|
|
|
#include <cstdint>
|
|
|
|
void JammerProcessor::execute(const buffer_c8_t& buffer) {
|
|
if (!configured) return;
|
|
|
|
for (size_t i = 0; i < buffer.count; i++) {
|
|
|
|
if (!jammer_duration) {
|
|
// Find next enabled range
|
|
do {
|
|
current_range++;
|
|
if (current_range == JAMMER_MAX_CH) current_range = 0;
|
|
} while (!jammer_channels[current_range].enabled);
|
|
|
|
jammer_duration = jammer_channels[current_range].duration;
|
|
jammer_bw = jammer_channels[current_range].width / 2; // TODO: Exact value
|
|
|
|
// Ask for retune
|
|
message.freq = jammer_channels[current_range].center;
|
|
message.range = current_range;
|
|
shared_memory.application_queue.push(message);
|
|
} else {
|
|
jammer_duration--;
|
|
}
|
|
|
|
// Phase noise
|
|
if (!period_counter) {
|
|
period_counter = noise_period;
|
|
|
|
if (noise_type == JammerType::TYPE_FSK) {
|
|
sample = (sample + lfsr) >> 1;
|
|
} else if (noise_type == JammerType::TYPE_TONE) {
|
|
tone_delta = 150000 + (lfsr >> 9); // Approx 100Hz to 6kHz
|
|
} else if (noise_type == JammerType::TYPE_SWEEP) {
|
|
sample++; // This is like saw wave FM
|
|
}
|
|
|
|
feedback = ((lfsr >> 31) ^ (lfsr >> 29) ^ (lfsr >> 15) ^ (lfsr >> 11)) & 1;
|
|
lfsr = (lfsr << 1) | feedback;
|
|
if (!lfsr) lfsr = 0x1337; // Shouldn't do this :(
|
|
} else {
|
|
period_counter--;
|
|
}
|
|
|
|
if (noise_type == JammerType::TYPE_TONE) {
|
|
aphase += tone_delta;
|
|
sample = sine_table_i8[(aphase & 0xFF000000) >> 24];
|
|
}
|
|
|
|
delta = sample * jammer_bw;
|
|
|
|
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 JammerProcessor::on_message(const Message* const msg) {
|
|
if (msg->id == Message::ID::JammerConfigure) {
|
|
const auto message = *reinterpret_cast<const JammerConfigureMessage*>(msg);
|
|
|
|
if (message.run) {
|
|
jammer_channels = (JammerChannel*)shared_memory.bb_data.data;
|
|
noise_type = message.type;
|
|
noise_period = 3072000 / message.speed;
|
|
if (noise_type == JammerType::TYPE_SWEEP)
|
|
noise_period >>= 8;
|
|
period_counter = 0;
|
|
jammer_duration = 0;
|
|
current_range = 0;
|
|
lfsr = 0xDEAD0012;
|
|
|
|
configured = true;
|
|
} else {
|
|
configured = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
int main() {
|
|
EventDispatcher event_dispatcher { std::make_unique<JammerProcessor>() };
|
|
event_dispatcher.run();
|
|
return 0;
|
|
}
|