crc.c

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/*
 * @brief Cyclic Redundancy Check (CRC) generator example.
 *
 * @note
 * Copyright(C) NXP Semiconductors, 2012
 * All rights reserved.
 *
 * @par
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * LPC products.  This software is supplied "AS IS" without any warranties of
 * any kind, and NXP Semiconductors and its licensor disclaim any and
 * all warranties, express or implied, including all implied warranties of
 * merchantability, fitness for a particular purpose and non-infringement of
 * intellectual property rights.  NXP Semiconductors assumes no responsibility
 * or liability for the use of the software, conveys no license or rights under any
 * patent, copyright, mask work right, or any other intellectual property rights in
 * or to any products. NXP Semiconductors reserves the right to make changes
 * in the software without notification. NXP Semiconductors also makes no
 * representation or warranty that such application will be suitable for the
 * specified use without further testing or modification.
 *
 * @par
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, under NXP Semiconductors' and its
 * licensor's relevant copyrights in the software, without fee, provided that it
 * is used in conjunction with NXP Semiconductors microcontrollers.  This
 * copyright, permission, and disclaimer notice must appear in all copies of
 * this code.
 */

#include "board.h"

/*****************************************************************************
 * Private types/enumerations/variables
 ****************************************************************************/

/* Expected CRC values for test */
#define EXPECTED_CCIT_SUM       (0xFD2F)
#define EXPECTED_CRC16_SUM      (0x2799)
#define EXPECTED_CRC32_SUM      (0x100ECE8C)

/* Test block size in bytes */
#define BLOCK_SIZE 0x40

/*****************************************************************************
 * Public types/enumerations/variables
 ****************************************************************************/

/*****************************************************************************
 * Private functions
 ****************************************************************************/

/* Populate block Data for tests */
static void initBlockData(uint8_t *p8)
{
 uint32_t i;

 for (i = 0; i < BLOCK_SIZE; i++) {
  p8[i] = i;
 }
}

/*****************************************************************************
 * Public functions
 ****************************************************************************/

int main(void) {
 uint32_t result;
 uint32_t BlockData[BLOCK_SIZE / 4];
 volatile int noExit = 1;/* For build warning only */

 /* Board Initialization */
 Board_Init();

 /* Chip Initialization */
 Chip_CRC_Init();

 Board_LED_Set(0, false);
 initBlockData((uint8_t *) BlockData);
 DEBUGSTR("CRC engine test\r\n");

 /* 8-bit CCIT */
 result = Chip_CRC_CRC8((const uint8_t *) BlockData, BLOCK_SIZE);
 DEBUGOUT("CCIT test results, expected 0x%x, got 0x%x\r\n",
    EXPECTED_CCIT_SUM, result);
 if (result != EXPECTED_CCIT_SUM) {
  Board_LED_Set(0, true);
 }

 /* 16-bit CRC16 */
 result = Chip_CRC_CRC16((const uint16_t *) BlockData, BLOCK_SIZE / 2);
 DEBUGOUT("CRC16 test results, expected 0x%x, got 0x%x\r\n",
    EXPECTED_CRC16_SUM, result);
 if (result != EXPECTED_CRC16_SUM) {
  Board_LED_Set(0, true);
 }

 /* 32-bit CRC16 */
 result = Chip_CRC_CRC32((const uint32_t *) BlockData, BLOCK_SIZE / 4);
 DEBUGOUT("CRC32 test results, expected 0x%x, got 0x%x\r\n",
    EXPECTED_CRC32_SUM, result);
 if (result != EXPECTED_CRC32_SUM) {
  Board_LED_Set(0, true);
 }

 while (noExit) {}

 return 0;
}