LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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crc_8xx.c
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1 /*
2  * @brief LPC8xx Cyclic Redundancy Check (CRC) Engine driver
3  *
4  * @note
5  * Copyright(C) NXP Semiconductors, 2012
6  * All rights reserved.
7  *
8  * @par
9  * Software that is described herein is for illustrative purposes only
10  * which provides customers with programming information regarding the
11  * LPC products. This software is supplied "AS IS" without any warranties of
12  * any kind, and NXP Semiconductors and its licenser disclaim any and
13  * all warranties, express or implied, including all implied warranties of
14  * merchantability, fitness for a particular purpose and non-infringement of
15  * intellectual property rights. NXP Semiconductors assumes no responsibility
16  * or liability for the use of the software, conveys no license or rights under any
17  * patent, copyright, mask work right, or any other intellectual property rights in
18  * or to any products. NXP Semiconductors reserves the right to make changes
19  * in the software without notification. NXP Semiconductors also makes no
20  * representation or warranty that such application will be suitable for the
21  * specified use without further testing or modification.
22  *
23  * @par
24  * Permission to use, copy, modify, and distribute this software and its
25  * documentation is hereby granted, under NXP Semiconductors' and its
26  * licensor's relevant copyrights in the software, without fee, provided that it
27  * is used in conjunction with NXP Semiconductors microcontrollers. This
28  * copyright, permission, and disclaimer notice must appear in all copies of
29  * this code.
30  */
31 
32 #include "chip.h"
33 
34 /*****************************************************************************
35  * Private types/enumerations/variables
36  ****************************************************************************/
37 
38 /*****************************************************************************
39  * Public types/enumerations/variables
40  ****************************************************************************/
41 
42 /*****************************************************************************
43  * Private functions
44  ****************************************************************************/
45 
46 /*****************************************************************************
47  * Public functions
48  ****************************************************************************/
49 
50 /* Configure CRC engine and compute CCITT checksum from 8-bit data */
51 uint32_t Chip_CRC_CRC8(const uint8_t *data, uint32_t bytes)
52 {
53  Chip_CRC_UseDefaultConfig(CRC_POLY_CCITT);
54  return IP_CRC_CRC8(LPC_CRC, data, bytes);
55 }
56 
57 /* Convenience function for computing a standard CRC16 checksum from 16-bit data block */
58 uint32_t Chip_CRC_CRC16(const uint16_t *data, uint32_t hwords)
59 {
60  Chip_CRC_UseDefaultConfig(CRC_POLY_CRC16);
61  return IP_CRC_CRC16(LPC_CRC, data, hwords);
62 }
63 
64 /* Convenience function for computing a standard CRC32 checksum from 32-bit data block */
65 uint32_t Chip_CRC_CRC32(const uint32_t *data, uint32_t words)
66 {
67  Chip_CRC_UseDefaultConfig(CRC_POLY_CRC32);
68  return IP_CRC_CRC32(LPC_CRC, data, words);
69 }