HackRF-Treasure-Chest/Software/portapack-mayhem/firmware/application/emu_cc1101.cpp
2022-09-22 09:26:57 -07:00

47 lines
1.3 KiB
C++

/*
* Copyright (C) 2017 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 "emu_cc1101.hpp"
namespace cc1101 {
void CC1101Emu::whitening_init() {
whitening_pn = 0x1FF;
}
// See TI app note DN509
uint8_t CC1101Emu::whiten_byte(uint8_t byte) {
uint_fast8_t new_bit;
byte ^= (whitening_pn & 0xFF);
for (size_t step = 0; step < 8; step++) {
new_bit = (whitening_pn & 1) ^ ((whitening_pn >> 5) & 1);
whitening_pn >>= 1;
whitening_pn |= (new_bit << 8);
}
return byte;
}
} /* namespace cc1101 */