硬件CRC校验的问题

chenbingjy · 最新更新于2023-05-23 15:55

硬件CRC校验的问题 [复制链接]

我有一块STM32F303的板子，里面有CRC的例程。

代码如下：

#include "main.h"

/** @addtogroup STM32F3xx_HAL_Examples
  * @{
  */

/** @addtogroup CRC_Example
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define BUFFER_SIZE    114

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* CRC handler declaration */
CRC_HandleTypeDef   CrcHandle;

/* Used for storing CRC Value */
__IO uint32_t uwCRCValue = 0;

static const uint32_t aDataBuffer[BUFFER_SIZE] =
{
  0x00001021, 0x20423063, 0x408450a5, 0x60c670e7, 0x9129a14a, 0xb16bc18c,
  0xd1ade1ce, 0xf1ef1231, 0x32732252, 0x52b54294, 0x72f762d6, 0x93398318,
  0xa35ad3bd, 0xc39cf3ff, 0xe3de2462, 0x34430420, 0x64e674c7, 0x44a45485,
  0xa56ab54b, 0x85289509, 0xf5cfc5ac, 0xd58d3653, 0x26721611, 0x063076d7,
  0x569546b4, 0xb75ba77a, 0x97198738, 0xf7dfe7fe, 0xc7bc48c4, 0x58e56886,
  0x78a70840, 0x18612802, 0xc9ccd9ed, 0xe98ef9af, 0x89489969, 0xa90ab92b,
  0x4ad47ab7, 0x6a961a71, 0x0a503a33, 0x2a12dbfd, 0xfbbfeb9e, 0x9b798b58,
  0xbb3bab1a, 0x6ca67c87, 0x5cc52c22, 0x3c030c60, 0x1c41edae, 0xfd8fcdec,
  0xad2abd0b, 0x8d689d49, 0x7e976eb6, 0x5ed54ef4, 0x2e321e51, 0x0e70ff9f,
  0xefbedfdd, 0xcffcbf1b, 0x9f598f78, 0x918881a9, 0xb1caa1eb, 0xd10cc12d,
  0xe16f1080, 0x00a130c2, 0x20e35004, 0x40257046, 0x83b99398, 0xa3fbb3da,
  0xc33dd31c, 0xe37ff35e, 0x129022f3, 0x32d24235, 0x52146277, 0x7256b5ea,
  0x95a88589, 0xf56ee54f, 0xd52cc50d, 0x34e224c3, 0x04817466, 0x64475424,
  0x4405a7db, 0xb7fa8799, 0xe75ff77e, 0xc71dd73c, 0x26d336f2, 0x069116b0,
  0x76764615, 0x5634d94c, 0xc96df90e, 0xe92f99c8, 0xb98aa9ab, 0x58444865,
  0x78066827, 0x18c008e1, 0x28a3cb7d, 0xdb5ceb3f, 0xfb1e8bf9, 0x9bd8abbb,
  0x4a755a54, 0x6a377a16, 0x0af11ad0, 0x2ab33a92, 0xed0fdd6c, 0xcd4dbdaa,
  0xad8b9de8, 0x8dc97c26, 0x5c644c45, 0x3ca22c83, 0x1ce00cc1, 0xef1fff3e,
  0xdf7caf9b, 0xbfba8fd9, 0x9ff86e17, 0x7e364e55, 0x2e933eb2, 0x0ed11ef0
};

/* Expected CRC Value */
uint32_t uwExpectedCRCValue = 0x379E9F06;

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void Error_Handler(void);

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

/**
  * [url=home.php?mod=space&uid=159083]@brief[/url] Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* STM32F3xx HAL library initialization:
       - Configure the Flash prefetch
       - Configure the Systick to generate an interrupt each 1 msec
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure the system clock to 64 MHz */
  SystemClock_Config();

  /* Configure LED1 and LED3 */
  BSP_LED_Init(LED1);
  BSP_LED_Init(LED3);

  /*##-1- Configure the CRC peripheral #######################################*/
  CrcHandle.Instance = CRC;

  /* The default polynomial is used */
  CrcHandle.Init.DefaultPolynomialUse    = DEFAULT_POLYNOMIAL_ENABLE;

  /* The default init value is used */
  CrcHandle.Init.DefaultInitValueUse     = DEFAULT_INIT_VALUE_ENABLE;

  /* The input data are not inverted */
  CrcHandle.Init.InputDataInversionMode  = CRC_INPUTDATA_INVERSION_NONE;

  /* The output data are not inverted */
  CrcHandle.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE;

  /* The input data are 32-bit long words */
  CrcHandle.InputDataFormat              = CRC_INPUTDATA_FORMAT_WORDS;

  if (HAL_CRC_Init(&CrcHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /*##-2- Compute the CRC of "aDataBuffer" ###################################*/
  //uwCRCValue = HAL_CRC_Calculate(&CrcHandle, (uint32_t *)aDataBuffer, BUFFER_SIZE);
	uwCRCValue = HAL_CRC_Calculate(&CrcHandle, (uint32_t *)aDataBuffer, 1);

  /*##-3- Compare the CRC value to the Expected one ##########################*/
  if (uwCRCValue != uwExpectedCRCValue)
  {
    /* Wrong CRC value: Turn LED3 on */
    Error_Handler();
  }
  else
  {
    /* Right CRC value: Turn LED1 on */
    BSP_LED_On(LED1);
  }

  /* Infinite loop */
  while (1)
  {
  }
}

程序里有114个数据，比如我只用一个数据

得出结果0x4bb7ed3f

我找到一个软件，算出的结果和程序里一样。

可是我不知道手算怎么得出同样的结果。

哪位大神知道，望告知，谢谢！

freebsder

谢谢分享，现在很多做单片机的还是不太会用各种外设。

bigbat

CRC有标准的程序，需要注意的是：

1、使用相同的校验和式，CrcHandle.Init.DefaultPolynomialUse定义

2、初始化的寄存器的值要一样

通常的程序都可以使用

chenbingjy

bigbat 发表于 2023-5-23 19:43 CRC有标准的程序，需要注意的是： 1、使用相同的校验和式，CrcHandle.Init.DefaultPolynomialUse定义 ...

谢谢！可是参考网上的例子，都算不对。

chenbingjy

我用VC写了一个CRC校验程序，可是不对

代码：

#include <stdio.h>

#define uint32_t unsigned  int

#define BUFFER_SIZE    114


unsigned  int value;
unsigned  int crc;

 uint32_t aDataBuffer[BUFFER_SIZE] =
{
  0x00001021, 0x20423063, 0x408450a5, 0x60c670e7, 0x9129a14a, 0xb16bc18c,
  0xd1ade1ce, 0xf1ef1231, 0x32732252, 0x52b54294, 0x72f762d6, 0x93398318,
  0xa35ad3bd, 0xc39cf3ff, 0xe3de2462, 0x34430420, 0x64e674c7, 0x44a45485,
  0xa56ab54b, 0x85289509, 0xf5cfc5ac, 0xd58d3653, 0x26721611, 0x063076d7,
  0x569546b4, 0xb75ba77a, 0x97198738, 0xf7dfe7fe, 0xc7bc48c4, 0x58e56886,
  0x78a70840, 0x18612802, 0xc9ccd9ed, 0xe98ef9af, 0x89489969, 0xa90ab92b,
  0x4ad47ab7, 0x6a961a71, 0x0a503a33, 0x2a12dbfd, 0xfbbfeb9e, 0x9b798b58,
  0xbb3bab1a, 0x6ca67c87, 0x5cc52c22, 0x3c030c60, 0x1c41edae, 0xfd8fcdec,
  0xad2abd0b, 0x8d689d49, 0x7e976eb6, 0x5ed54ef4, 0x2e321e51, 0x0e70ff9f,
  0xefbedfdd, 0xcffcbf1b, 0x9f598f78, 0x918881a9, 0xb1caa1eb, 0xd10cc12d,
  0xe16f1080, 0x00a130c2, 0x20e35004, 0x40257046, 0x83b99398, 0xa3fbb3da,
  0xc33dd31c, 0xe37ff35e, 0x129022f3, 0x32d24235, 0x52146277, 0x7256b5ea,
  0x95a88589, 0xf56ee54f, 0xd52cc50d, 0x34e224c3, 0x04817466, 0x64475424,
  0x4405a7db, 0xb7fa8799, 0xe75ff77e, 0xc71dd73c, 0x26d336f2, 0x069116b0,
  0x76764615, 0x5634d94c, 0xc96df90e, 0xe92f99c8, 0xb98aa9ab, 0x58444865,
  0x78066827, 0x18c008e1, 0x28a3cb7d, 0xdb5ceb3f, 0xfb1e8bf9, 0x9bd8abbb,
  0x4a755a54, 0x6a377a16, 0x0af11ad0, 0x2ab33a92, 0xed0fdd6c, 0xcd4dbdaa,
  0xad8b9de8, 0x8dc97c26, 0x5c644c45, 0x3ca22c83, 0x1ce00cc1, 0xef1fff3e,
  0xdf7caf9b, 0xbfba8fd9, 0x9ff86e17, 0x7e364e55, 0x2e933eb2, 0x0ed11ef0
};

unsigned  int reflect(unsigned  int ref,unsigned char ch)//位翻转函数
{	
	int i;
	for( i = 1; i < ( ch + 1 ); i++ )
	{
		if( ref & 1 )
			value |= 1 << ( ch - i );
		ref >>= 1;
	}
	return value;
}
unsigned  int crc32_bit(unsigned  int *ptr, unsigned int len, unsigned  int gx)
{
    unsigned char i;
	unsigned int crc = 0xffffffff;
    while( len-- )
    {
        for( i = 1; i != 0; i <<= 1 )
        {
            if( ( crc & 0x80000000 ) != 0 )
			{
				crc <<= 1;
				crc ^= gx;
			}
            else 
				crc <<= 1;
            if( ( *ptr & i ) != 0 ) 
				crc ^= gx;
        }
        ptr++;
    }
    return ( crc ^ 0x00000000 );
}
//unsigned char  tx_data[] = {0x31,0x32,0x33,0x34,0x35,0x36, 0x37,0x38, 
       // 0x39,0x30 };

int main()
{
    unsigned  int *data;
	data = aDataBuffer;
    //unsigned int dataLen = sizeof(aDataBuffer);
 	printf(" crc32= %08x\n",crc32_bit( data, 1, 0x04c11db7 ));
    return 0;
}
//0x261daee5

结果是0x34002986

网上的一个计算软件如下：

大神看看，我的程序哪儿有错？谢谢！

chunyang

仔细看明白程序所表达的算法，手算的过程类似，但不适合，实在太麻烦了。关于CRC的算法，我曾在多年前（十几年前，在本站应为2011年）发过相关帖，给出了CRC16和CRC CCITT的算法，二者仅生成多项式不同，算法则完全一样。理论上，所有CRC的算法都类似，楼主可去找出老帖看看。

huo_hu

你找一个不是查表法的程序就知道了

chenbingjy

huo_hu 发表于 2023-5-24 17:17 你找一个不是查表法的程序就知道了

我找了不少不是查表法的程序，不管用。我甚至买了一本书，参考书上的例子也不行。

chenbingjy

如果您需要查看本帖隐藏内容，请登录或者注册

硬件CRC校验的问题 [复制链接]

最新回复

点评

点评

点评

技术导师勋章