portapack-mayhem/firmware/baseband-tx/proc_fsk_lcr.cpp
furrtek 802ac496e9 Xylos (CCIR tones) TX, jammer update, SD card mod load
Xylos TX (CCIR tones) ;)
Jammer update, still buggy and inefficient
SD card module loader update
2016-01-03 07:24:30 +01:00

94 lines
2.4 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* 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_lcr.hpp"
#include "portapack_shared_memory.hpp"
#include "sine_table.hpp"
#include <cstdint>
void LCRFSKProcessor::execute(buffer_c8_t buffer) {
for (size_t i = 0; i<buffer.count; i++) {
//Sample generation 2.28M/10 = 228kHz
if (s >= 9) {
s = 0;
if (sample_count >= shared_memory.afsk_samples_per_bit) {
if (shared_memory.afsk_transmit_done == false)
cur_byte = shared_memory.lcrdata[byte_pos];
if (!cur_byte) {
if (shared_memory.afsk_repeat) {
shared_memory.afsk_repeat--;
bit_pos = 0;
byte_pos = 0;
cur_byte = shared_memory.lcrdata[0];
message.n = shared_memory.afsk_repeat;
shared_memory.application_queue.push(message);
} else {
message.n = 0;
shared_memory.afsk_transmit_done = true;
shared_memory.application_queue.push(message);
cur_byte = 0;
}
}
gbyte = 0;
gbyte = cur_byte << 1;
gbyte |= 1;
cur_bit = (gbyte >> (9-bit_pos)) & 1;
if (bit_pos == 9) {
bit_pos = 0;
byte_pos++;
} else {
bit_pos++;
}
sample_count = 0;
} else {
sample_count++;
}
if (cur_bit)
aphase += shared_memory.afsk_phase_inc_mark;
else
aphase += shared_memory.afsk_phase_inc_space;
} else {
s++;
}
sample = (sine_table_f32[(aphase & 0x03FF0000)>>18]*255);
//FM
frq = sample * shared_memory.afsk_fmmod;
phase = (phase + frq);
sphase = phase + (256<<16);
re = (sine_table_f32[(sphase & 0x03FF0000)>>18]*127);
im = (sine_table_f32[(phase & 0x03FF0000)>>18]*127);
buffer.p[i] = {(int8_t)re,(int8_t)im};
}
}