mirror of https://github.com/ARMmbed/mbed-os.git
59 lines
2.4 KiB
C
59 lines
2.4 KiB
C
/*
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* Copyright (c) 2013 Nordic Semiconductor ASA
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
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* integrated circuit in a product or a software update for such product, must reproduce
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* the above copyright notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary or object form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "crc16.h"
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#include <stdlib.h>
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uint16_t crc16_compute(uint8_t const * p_data, uint32_t size, uint16_t const * p_crc)
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{
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uint16_t crc = (p_crc == NULL) ? 0xFFFF : *p_crc;
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for (uint32_t i = 0; i < size; i++)
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{
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crc = (uint8_t)(crc >> 8) | (crc << 8);
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crc ^= p_data[i];
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crc ^= (uint8_t)(crc & 0xFF) >> 4;
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crc ^= (crc << 8) << 4;
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crc ^= ((crc & 0xFF) << 4) << 1;
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}
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return crc;
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}
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