mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-11 00:34:29 -05:00
033c4e9a5b
* Updated style * Updated files * fixed new line * Updated spacing * File fix WIP * Updated to clang 13 * updated comment style * Removed old comment code
127 lines
3.0 KiB
C++
127 lines
3.0 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 "ax25.hpp"
|
|
|
|
#include "portapack_shared_memory.hpp"
|
|
|
|
namespace ax25 {
|
|
|
|
void AX25Frame::make_extended_field(char* const data, size_t length) {
|
|
size_t i = 0;
|
|
|
|
for (i = 0; i < length - 1; i++)
|
|
add_data(data[i] << 1);
|
|
|
|
add_data((data[i] << 1) | 1);
|
|
}
|
|
|
|
void AX25Frame::NRZI_add_bit(const uint32_t bit) {
|
|
if (!bit)
|
|
current_bit ^= 1; // Zero: flip
|
|
|
|
current_byte <<= 1;
|
|
current_byte |= current_bit;
|
|
|
|
bit_counter++;
|
|
|
|
if (bit_counter == 8) {
|
|
bit_counter = 0;
|
|
*bb_data_ptr = current_byte;
|
|
bb_data_ptr++;
|
|
}
|
|
}
|
|
|
|
void AX25Frame::add_byte(uint8_t byte, bool is_flag, bool is_data) {
|
|
bool bit;
|
|
|
|
if (is_data)
|
|
crc_ccitt.process_byte(byte);
|
|
|
|
for (uint32_t i = 0; i < 8; i++) {
|
|
bit = (byte >> i) & 1;
|
|
|
|
NRZI_add_bit(bit);
|
|
|
|
if (bit) {
|
|
ones_counter++;
|
|
if ((ones_counter == 5) && (!is_flag)) {
|
|
NRZI_add_bit(0);
|
|
ones_counter = 0;
|
|
}
|
|
} else
|
|
ones_counter = 0;
|
|
}
|
|
}
|
|
|
|
void AX25Frame::flush() {
|
|
if (bit_counter)
|
|
*bb_data_ptr = current_byte << (8 - bit_counter); // euquiq: This was 7 but there are 8 bits
|
|
};
|
|
|
|
void AX25Frame::add_flag() {
|
|
add_byte(AX25_FLAG, true, false);
|
|
};
|
|
|
|
void AX25Frame::add_data(uint8_t byte) {
|
|
add_byte(byte, false, true);
|
|
};
|
|
|
|
void AX25Frame::add_checksum() {
|
|
auto checksum = crc_ccitt.checksum();
|
|
add_byte(checksum, false, false);
|
|
add_byte(checksum >> 8, false, false);
|
|
}
|
|
|
|
void AX25Frame::make_ui_frame(char* const address, const uint8_t control, const uint8_t protocol, const std::string& info) {
|
|
size_t i;
|
|
|
|
bb_data_ptr = (uint16_t*)shared_memory.bb_data.data;
|
|
memset(bb_data_ptr, 0, sizeof(shared_memory.bb_data.data));
|
|
bit_counter = 0;
|
|
current_bit = 0;
|
|
current_byte = 0;
|
|
ones_counter = 0;
|
|
crc_ccitt.reset();
|
|
|
|
add_flag();
|
|
add_flag();
|
|
add_flag();
|
|
add_flag();
|
|
|
|
make_extended_field(address, 14);
|
|
add_data(control);
|
|
add_data(protocol);
|
|
|
|
for (i = 0; i < info.size(); i++)
|
|
add_data(info[i]);
|
|
|
|
add_checksum();
|
|
|
|
add_flag();
|
|
add_flag();
|
|
|
|
flush();
|
|
}
|
|
|
|
} /* namespace ax25 */
|