Nordic nrf51 sdk sources. Mirrored from https://github.com/ARMmbed/nrf51-sdk.
source/nordic_sdk/components/libraries/crc16/crc16.c
- Committer:
- vcoubard
- Date:
- 2016-04-07
- Revision:
- 28:041dac1366b2
- Parent:
- 20:a90c48eb1d30
- Child:
- 29:286940b7ee5a
File content as of revision 28:041dac1366b2:
/* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved. * * The information contained herein is property of Nordic Semiconductor ASA. * Terms and conditions of usage are described in detail in NORDIC * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT. * * Licensees are granted free, non-transferable use of the information. NO * WARRANTY of ANY KIND is provided. This heading must NOT be removed from * the file. * */ #include "crc16.h" #include <stdio.h> uint16_t crc16_compute(const uint8_t * p_data, uint32_t size, const uint16_t * p_crc) { uint32_t i; uint16_t crc = (p_crc == NULL) ? 0xffff : *p_crc; for (i = 0; i < size; i++) { crc = (unsigned char)(crc >> 8) | (crc << 8); crc ^= p_data[i]; crc ^= (unsigned char)(crc & 0xff) >> 4; crc ^= (crc << 8) << 4; crc ^= ((crc & 0xff) << 4) << 1; } return crc; }