Theo Havercroft / nRF51822

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Dependencies:   nrf51-sdk

Fork of nRF51822 by Lancaster University

source/nordic-sdk/components/libraries/crc16/crc16.c@615:65ea2acfc6a2, 2016-04-06 (annotated)

Committer:
LancasterUniversity
Date:
Wed Apr 06 22:38:43 2016 +0100
Revision:
615:65ea2acfc6a2
Synchronized with git rev 60a7c0c0

Author: Rohit Grover

bring in the latest changes for BLE::init() where we allow <object, member> tuples for init callback.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
LancasterUniversity 615:65ea2acfc6a2 1 /*
LancasterUniversity 615:65ea2acfc6a2 2 * Copyright (c) Nordic Semiconductor ASA
LancasterUniversity 615:65ea2acfc6a2 3 * All rights reserved.
LancasterUniversity 615:65ea2acfc6a2 4 *
LancasterUniversity 615:65ea2acfc6a2 5 * Redistribution and use in source and binary forms, with or without modification,
LancasterUniversity 615:65ea2acfc6a2 6 * are permitted provided that the following conditions are met:
LancasterUniversity 615:65ea2acfc6a2 7 *
LancasterUniversity 615:65ea2acfc6a2 8 * 1. Redistributions of source code must retain the above copyright notice, this
LancasterUniversity 615:65ea2acfc6a2 9 * list of conditions and the following disclaimer.
LancasterUniversity 615:65ea2acfc6a2 10 *
LancasterUniversity 615:65ea2acfc6a2 11 * 2. Redistributions in binary form must reproduce the above copyright notice, this
LancasterUniversity 615:65ea2acfc6a2 12 * list of conditions and the following disclaimer in the documentation and/or
LancasterUniversity 615:65ea2acfc6a2 13 * other materials provided with the distribution.
LancasterUniversity 615:65ea2acfc6a2 14 *
LancasterUniversity 615:65ea2acfc6a2 15 * 3. Neither the name of Nordic Semiconductor ASA nor the names of other
LancasterUniversity 615:65ea2acfc6a2 16 * contributors to this software may be used to endorse or promote products
LancasterUniversity 615:65ea2acfc6a2 17 * derived from this software without specific prior written permission.
LancasterUniversity 615:65ea2acfc6a2 18 *
LancasterUniversity 615:65ea2acfc6a2 19 *
LancasterUniversity 615:65ea2acfc6a2 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
LancasterUniversity 615:65ea2acfc6a2 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
LancasterUniversity 615:65ea2acfc6a2 22 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
LancasterUniversity 615:65ea2acfc6a2 23 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
LancasterUniversity 615:65ea2acfc6a2 24 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
LancasterUniversity 615:65ea2acfc6a2 25 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LancasterUniversity 615:65ea2acfc6a2 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
LancasterUniversity 615:65ea2acfc6a2 27 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
LancasterUniversity 615:65ea2acfc6a2 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
LancasterUniversity 615:65ea2acfc6a2 29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
LancasterUniversity 615:65ea2acfc6a2 30 *
LancasterUniversity 615:65ea2acfc6a2 31 */
LancasterUniversity 615:65ea2acfc6a2 32
LancasterUniversity 615:65ea2acfc6a2 33 #include "crc16.h"
LancasterUniversity 615:65ea2acfc6a2 34 #include <stdio.h>
LancasterUniversity 615:65ea2acfc6a2 35
LancasterUniversity 615:65ea2acfc6a2 36 uint16_t crc16_compute(const uint8_t * p_data, uint32_t size, const uint16_t * p_crc)
LancasterUniversity 615:65ea2acfc6a2 37 {
LancasterUniversity 615:65ea2acfc6a2 38 uint32_t i;
LancasterUniversity 615:65ea2acfc6a2 39 uint16_t crc = (p_crc == NULL) ? 0xffff : *p_crc;
LancasterUniversity 615:65ea2acfc6a2 40
LancasterUniversity 615:65ea2acfc6a2 41 for (i = 0; i < size; i++)
LancasterUniversity 615:65ea2acfc6a2 42 {
LancasterUniversity 615:65ea2acfc6a2 43 crc = (unsigned char)(crc >> 8) | (crc << 8);
LancasterUniversity 615:65ea2acfc6a2 44 crc ^= p_data[i];
LancasterUniversity 615:65ea2acfc6a2 45 crc ^= (unsigned char)(crc & 0xff) >> 4;
LancasterUniversity 615:65ea2acfc6a2 46 crc ^= (crc << 8) << 4;
LancasterUniversity 615:65ea2acfc6a2 47 crc ^= ((crc & 0xff) << 4) << 1;
LancasterUniversity 615:65ea2acfc6a2 48 }
LancasterUniversity 615:65ea2acfc6a2 49
LancasterUniversity 615:65ea2acfc6a2 50 return crc;
LancasterUniversity 615:65ea2acfc6a2 51 }