47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
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/*
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* Copyright (C) 2017 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2017 Furrtek
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "emu_cc1101.hpp"
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namespace cc1101 {
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void CC1101Emu::whitening_init() {
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whitening_pn = 0x1FF;
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}
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// See TI app note DN509
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uint8_t CC1101Emu::whiten_byte(uint8_t byte) {
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uint_fast8_t new_bit;
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byte ^= (whitening_pn & 0xFF);
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for (size_t step = 0; step < 8; step++) {
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new_bit = (whitening_pn & 1) ^ ((whitening_pn >> 5) & 1);
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whitening_pn >>= 1;
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whitening_pn |= (new_bit << 8);
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}
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return byte;
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}
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} /* namespace cc1101 */
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