Jonathan Austin / nRF51822

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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@345:dfde56236c36, 2015-06-19 (annotated)

Committer:
rgrover1
Date:
Fri Jun 19 15:55:35 2015 +0100
Revision:
345:dfde56236c36
Parent:
343:6675661fa600
Child:
346:14b090482fd2
Synchronized with git rev fbfc6d16

Author: Andrew Fernandes

Fix various GCC compilation issues.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rgrover1 345:dfde56236c36 1 /* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved.
rgrover1 345:dfde56236c36 2 *
rgrover1 345:dfde56236c36 3 * The information contained herein is property of Nordic Semiconductor ASA.
rgrover1 345:dfde56236c36 4 * Terms and conditions of usage are described in detail in NORDIC
rgrover1 345:dfde56236c36 5 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
rgrover1 345:dfde56236c36 6 *
rgrover1 345:dfde56236c36 7 * Licensees are granted free, non-transferable use of the information. NO
rgrover1 345:dfde56236c36 8 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
rgrover1 345:dfde56236c36 9 * the file.
rgrover1 345:dfde56236c36 10 *
rgrover1 345:dfde56236c36 11 */
rgrover1 345:dfde56236c36 12
rgrover1 345:dfde56236c36 13 #include "crc16.h"
rgrover1 345:dfde56236c36 14 #include <stdio.h>
rgrover1 345:dfde56236c36 15
rgrover1 345:dfde56236c36 16 uint16_t crc16_compute(const uint8_t * p_data, uint32_t size, const uint16_t * p_crc)
rgrover1 345:dfde56236c36 17 {
rgrover1 345:dfde56236c36 18 uint32_t i;
rgrover1 345:dfde56236c36 19 uint16_t crc = (p_crc == NULL) ? 0xffff : *p_crc;
rgrover1 345:dfde56236c36 20
rgrover1 345:dfde56236c36 21 for (i = 0; i < size; i++)
rgrover1 345:dfde56236c36 22 {
rgrover1 345:dfde56236c36 23 crc = (unsigned char)(crc >> 8) | (crc << 8);
rgrover1 345:dfde56236c36 24 crc ^= p_data[i];
rgrover1 345:dfde56236c36 25 crc ^= (unsigned char)(crc & 0xff) >> 4;
rgrover1 345:dfde56236c36 26 crc ^= (crc << 8) << 4;
rgrover1 345:dfde56236c36 27 crc ^= ((crc & 0xff) << 4) << 1;
rgrover1 345:dfde56236c36 28 }
rgrover1 345:dfde56236c36 29
rgrover1 345:dfde56236c36 30 return crc;
rgrover1 345:dfde56236c36 31 }