【STM32L562E-DK测评】-4-体验硬件CRC循环冗余校验

只看该作者 · 2025-3-6 12:52

CRC 循环冗余校验（CRC：Cyclic Redundancy Check）是一种错误检测算法，通常在通信协议中或存储设备中用于检测原始数据的意外变动。可以简单理解成对有用数据按照一定的算法进行计算后，提取出一个特征值，并附加在有用数据后。在应用中将有用数据按照特定的算法提取特征值与预先存储的特征值进行比对，如相等则校验通过，反之校验失败，从而识别出数据是否异常。

本质就是把原始数据先左移，然后再进行二进制除法，除数是特定的多项式。最后把余数附到原始数据后面发送出去。

在cubemx里面配置：

生成初始化代码：

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static void MX_CRC_Init(void)

{



  /* USER CODE BEGIN CRC_Init 0 */



  /* USER CODE END CRC_Init 0 */



  /* USER CODE BEGIN CRC_Init 1 */



  /* USER CODE END CRC_Init 1 */

  hcrc.Instance = CRC;

  hcrc.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE;

  hcrc.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_ENABLE;

  hcrc.Init.InputDataInversionMode = CRC_INPUTDATA_INVERSION_NONE;

  hcrc.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE;

  hcrc.InputDataFormat = CRC_INPUTDATA_FORMAT_WORDS;

  if (HAL_CRC_Init(&hcrc) != HAL_OK)

  {

    Error_Handler();

  }

  /* USER CODE BEGIN CRC_Init 2 */



  /* USER CODE END CRC_Init 2 */



}

调用STM32L5的CRC 接口进行计算：

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HAL_CRC_Calculate(&hcrc, (uint32_t *)aDataBuffer, BUFFER_SIZE)

待计算的原始数据：

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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

};

如果计算结果与预期一致，点亮LED10.

编译，烧录：

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Erasing memory corresponding to segment 0:

Erasing internal memory sectors [0 4]

Download in Progress:





File download complete

Time elapsed during download operation: 00:00:00.295







Verifying ...









Download verified successfully 





Shutting down...

Exit.

复位后，计算正确，LED10点亮。

参考：
粉丝分享 | 图说CRC原理应用及STM32硬件CRC外设 https://zhuanlan.zhihu.com/p/285124407