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crc16.c
00001 /* 00002 * Copyright (c) Nordic Semiconductor ASA 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without modification, 00006 * are permitted provided that the following conditions are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright notice, this 00009 * list of conditions and the following disclaimer. 00010 * 00011 * 2. Redistributions in binary form must reproduce the above copyright notice, this 00012 * list of conditions and the following disclaimer in the documentation and/or 00013 * other materials provided with the distribution. 00014 * 00015 * 3. Neither the name of Nordic Semiconductor ASA nor the names of other 00016 * contributors to this software may be used to endorse or promote products 00017 * derived from this software without specific prior written permission. 00018 * 00019 * 00020 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 00021 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 00022 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00023 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 00024 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 00025 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00026 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 00027 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00028 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00029 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00030 * 00031 */ 00032 00033 #include "crc16.h " 00034 #include <stdio.h> 00035 00036 uint16_t crc16_compute(const uint8_t * p_data, uint32_t size, const uint16_t * p_crc) 00037 { 00038 uint32_t i; 00039 uint16_t crc = (p_crc == NULL) ? 0xffff : *p_crc; 00040 00041 for (i = 0; i < size; i++) 00042 { 00043 crc = (unsigned char)(crc >> 8) | (crc << 8); 00044 crc ^= p_data[i]; 00045 crc ^= (unsigned char)(crc & 0xff) >> 4; 00046 crc ^= (crc << 8) << 4; 00047 crc ^= ((crc & 0xff) << 4) << 1; 00048 } 00049 00050 return crc; 00051 }
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