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crc.c
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1 /*
2 * @brief Cyclic Redundancy Check (CRC) generator example.
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 licensor 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 "board.h"
33
60 /*****************************************************************************
61 * Private types/enumerations/variables
62 ****************************************************************************/
63
64 /* Expected CRC values for test */
65 #define EXPECTED_CCIT_SUM (0xFD2F)
66 #define EXPECTED_CRC16_SUM (0x2799)
67 #define EXPECTED_CRC32_SUM (0x100ECE8C)
68
69 /* Test block size in bytes */
70 #define BLOCK_SIZE 0x40
71
72 /*****************************************************************************
73 * Public types/enumerations/variables
74 ****************************************************************************/
75
76 /*****************************************************************************
77 * Private functions
78 ****************************************************************************/
79
80 /* Populate block Data for tests */
81 static void initBlockData(uint8_t *p8)
82 {
83 uint32_t i;
84
85 for (i = 0; i < BLOCK_SIZE; i++) {
86 p8[i] = i;
87 }
88 }
89
90 /*****************************************************************************
91 * Public functions
92 ****************************************************************************/
93
98 int main(void) {
99 uint32_t result;
100 uint32_t BlockData[BLOCK_SIZE / 4];
101 volatile int noExit = 1;/* For build warning only */
102
103 /* Board Initialization */
104 Board_Init();
105
106 /* Chip Initialization */
107 Chip_CRC_Init();
108
109 Board_LED_Set(0, false);
110 initBlockData((uint8_t *) BlockData);
111 DEBUGSTR("CRC engine test\r\n");
112
113 /* 8-bit CCIT */
114 result = Chip_CRC_CRC8((const uint8_t *) BlockData, BLOCK_SIZE);
115 DEBUGOUT("CCIT test results, expected 0x%x, got 0x%x\r\n",
116 EXPECTED_CCIT_SUM, result);
117 if (result != EXPECTED_CCIT_SUM) {
118 Board_LED_Set(0, true);
119 }
120
121 /* 16-bit CRC16 */
122 result = Chip_CRC_CRC16((const uint16_t *) BlockData, BLOCK_SIZE / 2);
123 DEBUGOUT("CRC16 test results, expected 0x%x, got 0x%x\r\n",
124 EXPECTED_CRC16_SUM, result);
125 if (result != EXPECTED_CRC16_SUM) {
126 Board_LED_Set(0, true);
127 }
128
129 /* 32-bit CRC16 */
130 result = Chip_CRC_CRC32((const uint32_t *) BlockData, BLOCK_SIZE / 4);
131 DEBUGOUT("CRC32 test results, expected 0x%x, got 0x%x\r\n",
132 EXPECTED_CRC32_SUM, result);
133 if (result != EXPECTED_CRC32_SUM) {
134 Board_LED_Set(0, true);
135 }
136
137 while (noExit) {}
138
139 return 0;
140 }
141