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STM32F030RC CRC value wrong

Question asked by Treacy Yao on Jan 23, 2018
Latest reply on Jan 31, 2018 by Clive One

I want to add crc function for the IAP-APP function. So I used the CRC example in STM32Cube_FW_F0_V1.9.0 to test. But uwCRCValue is always 0.  I think the uwExpectedCRCValue should be the last four byte (0x0803FFFB-0x0803FFFF), and uwCRCValue should be the same value. Attach is the IAR configuration for CRC. Did my understanding wrong or my code below is wrong?

 

 

#define BUFFER_SIZE    114

 

static const uint32_t aDataBuffer[BUFFER_SIZE]
#ifdef PUBLIC_C
=
{
  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
}
#endif
;

 

static void MX_CRC_Init(void)
{
 CrcHandle.Instance = CRC;
 /* The default polynomial is not used. It is required to defined it in CrcHandle.Init.GeneratingPolynomial*/ 
 CrcHandle.Init.DefaultPolynomialUse = DEFAULT_POLYNOMIAL_ENABLE;
 /* Set the value of the polynomial */
 //CrcHandle.Init.GeneratingPolynomial = DEFAULT_POLYNOMIAL_ENABLE;
 /* The size of the polynomial to configure the IP is 8b*/
 CrcHandle.Init.CRCLength = CRC_POLYLENGTH_32B;
 /* The default init value is used */
 CrcHandle.Init.DefaultInitValueUse = DEFAULT_INIT_VALUE_DISABLE;
 /* 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 bits lenght */
 CrcHandle.InputDataFormat = CRC_INPUTDATA_FORMAT_WORDS;
 if (HAL_CRC_Init(&CrcHandle) != HAL_OK)
 {
  /* Initialization Error */
  Error_Handler();
 }
}
void APP_CRC(void)
{
  /*##-2- Compute the CRC of "aDataBuffer" ###################################*/
 uwCRCValue = HAL_CRC_Calculate(&CrcHandle, (uint32_t *)&aDataBuffer, BUFFER_SIZE);

 TRACE_DBG_STRING(DEBUG_MODULE, LOG_LVL_INFO, "APP_CRC: %x,%x", uwCRCValue,uwExpectedCRCValue);
 /*##-3- Compare the CRC value to the Expected one ##########################*/
 if (uwCRCValue != uwExpectedCRCValue)
 {
  /* Wrong CRC value: enter Error_Handler */
  TRACE_DBG_STRING(DEBUG_MODULE, LOG_LVL_INFO, "CRC err");
//  Error_Handler();
 }
 else
 {
  /* Right CRC value: Turn LED2 on */
  TRACE_DBG_STRING(DEBUG_MODULE, LOG_LVL_INFO, "CRC success");
 }
}

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