Jonathan Austin / nRF51822

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependents:   microbit_rubber_ducky microbit_mouse_BLE microbit_mouse_BLE_daybreak_version microbit_presenter

Fork of nRF51822 by Nordic Semiconductor

nordic-sdk/components/libraries/crc16/crc16.c

Committer:
rgrover1
Date:
2015-06-19
Revision:
345:dfde56236c36
Parent:
343:6675661fa600
Child:
346:14b090482fd2

File content as of revision 345:dfde56236c36:

/* 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;
}