S Classen / nrf51-sdk

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Fork of nrf51-sdk by Nordic Semiconductor

source/nordic_sdk/components/libraries/crc16/crc16.c@28:041dac1366b2, 2016-04-07 (annotated)

Committer:
vcoubard
Date:
Thu Apr 07 17:37:56 2016 +0100
Revision:
28:041dac1366b2
Parent:
20:a90c48eb1d30
Child:
29:286940b7ee5a
Synchronized with git rev 012b8118

Author: Liyou Zhou

Pull in files from sdk 10.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vcoubard 28:041dac1366b2 1 /* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved.
vcoubard 28:041dac1366b2 2 *
vcoubard 28:041dac1366b2 3 * The information contained herein is property of Nordic Semiconductor ASA.
vcoubard 28:041dac1366b2 4 * Terms and conditions of usage are described in detail in NORDIC
vcoubard 28:041dac1366b2 5 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
vcoubard 28:041dac1366b2 6 *
vcoubard 28:041dac1366b2 7 * Licensees are granted free, non-transferable use of the information. NO
vcoubard 28:041dac1366b2 8 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
vcoubard 28:041dac1366b2 9 * the file.
vcoubard 28:041dac1366b2 10 *
Vincent Coubard 0:f2542974c862 11 */
Vincent Coubard 0:f2542974c862 12
Vincent Coubard 0:f2542974c862 13 #include "crc16.h"
Vincent Coubard 0:f2542974c862 14 #include <stdio.h>
Vincent Coubard 0:f2542974c862 15
Vincent Coubard 0:f2542974c862 16 uint16_t crc16_compute(const uint8_t * p_data, uint32_t size, const uint16_t * p_crc)
Vincent Coubard 0:f2542974c862 17 {
Vincent Coubard 0:f2542974c862 18 uint32_t i;
Vincent Coubard 0:f2542974c862 19 uint16_t crc = (p_crc == NULL) ? 0xffff : *p_crc;
Vincent Coubard 0:f2542974c862 20
Vincent Coubard 0:f2542974c862 21 for (i = 0; i < size; i++)
Vincent Coubard 0:f2542974c862 22 {
Vincent Coubard 0:f2542974c862 23 crc = (unsigned char)(crc >> 8) | (crc << 8);
Vincent Coubard 0:f2542974c862 24 crc ^= p_data[i];
Vincent Coubard 0:f2542974c862 25 crc ^= (unsigned char)(crc & 0xff) >> 4;
Vincent Coubard 0:f2542974c862 26 crc ^= (crc << 8) << 4;
Vincent Coubard 0:f2542974c862 27 crc ^= ((crc & 0xff) << 4) << 1;
Vincent Coubard 0:f2542974c862 28 }
Vincent Coubard 0:f2542974c862 29
Vincent Coubard 0:f2542974c862 30 return crc;
vcoubard 1:ebc0e0ef0a11 31 }