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BLE_TEST_konashi
konashi/SBBLEのテスト
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crc16.cpp
00001 /* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved. 00002 * 00003 * The information contained herein is property of Nordic Semiconductor ASA. 00004 * Terms and conditions of usage are described in detail in NORDIC 00005 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT. 00006 * 00007 * Licensees are granted free, non-transferable use of the information. NO 00008 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from 00009 * the file. 00010 * 00011 */ 00012 00013 #include "crc16.h " 00014 #include <stdio.h> 00015 00016 uint16_t crc16_compute(const uint8_t * p_data, uint32_t size, const uint16_t * p_crc) 00017 { 00018 uint32_t i; 00019 uint16_t crc = (p_crc == NULL) ? 0xffff : *p_crc; 00020 00021 for (i = 0; i < size; i++) 00022 { 00023 crc = (unsigned char)(crc >> 8) | (crc << 8); 00024 crc ^= p_data[i]; 00025 crc ^= (unsigned char)(crc & 0xff) >> 4; 00026 crc ^= (crc << 8) << 4; 00027 crc ^= ((crc & 0xff) << 4) << 1; 00028 } 00029 00030 return crc; 00031 }
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