Toyomasa Watarai / nrf51-sdk

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Fork of nrf51-sdk by Nordic Semiconductor

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;
}