/**
* @brief Computes the 32-bit CRC of 32-bit data buffer independently
* of the previous CRC value.
* @param hcrc: pointer to a CRC_HandleTypeDef structure that contains
* the configuration information for CRC
* @param pBuffer: Pointer to the buffer containing the data to be computed
* @param BufferLength: Length of the buffer to be computed
* @retval 32-bit CRC
*/
uint32_t HAL_CRC_Calculate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)
{
uint32_t index = 0;
/* Process Locked */
__HAL_LOCK(hcrc);
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_BUSY;
/* Reset CRC Calculation Unit */
__HAL_CRC_DR_RESET(hcrc);
/* Enter Data to the CRC calculator */
for(index = 0; index < BufferLength; index++)
{
hcrc->Instance->DR = pBuffer[index];
}
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_READY;
/* Process Unlocked */
__HAL_UNLOCK(hcrc);
/* Return the CRC computed value */
return hcrc->Instance->DR;
}
/**
* @brief DeInitializes the CRC peripheral.
* @param hcrc: CRC handle
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CRC_DeInit(CRC_HandleTypeDef *hcrc)
{
/* Check the CRC handle allocation */
if(hcrc == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance));
/* Check the CRC peripheral state */
if(hcrc->State == HAL_CRC_STATE_BUSY)
{
return HAL_BUSY;
}
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_BUSY;
/* Reset CRC calculation unit */
__HAL_CRC_DR_RESET(hcrc);
/* DeInit the low level hardware */
HAL_CRC_MspDeInit(hcrc);
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_RESET;
/* Process unlocked */
__HAL_UNLOCK(hcrc);
/* Return function status */
return HAL_OK;
}
/**
* @brief Compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 32-bit data buffer
* starting with hcrc->Instance->INIT as initialization value.
* @param hcrc: CRC handle
* @param pBuffer: pointer to the input data buffer, exact input data format is
* provided by hcrc->InputDataFormat.
* @param BufferLength: input data buffer length
* @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits)
*/
uint32_t HAL_CRC_Calculate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)
{
uint32_t index = 0; /* CRC input data buffer index */
uint32_t temp = 0; /* CRC output (read from hcrc->Instance->DR register) */
/* Process locked */
__HAL_LOCK(hcrc);
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_BUSY;
/* Reset CRC Calculation Unit (hcrc->Instance->INIT is
* written in hcrc->Instance->DR) */
__HAL_CRC_DR_RESET(hcrc);
switch (hcrc->InputDataFormat)
{
case CRC_INPUTDATA_FORMAT_WORDS:
/* Enter 32-bit input data to the CRC calculator */
for(index = 0; index < BufferLength; index++)
{
hcrc->Instance->DR = pBuffer[index];
}
temp = hcrc->Instance->DR;
break;
case CRC_INPUTDATA_FORMAT_BYTES:
/* Specific 8-bit input data handling */
temp = CRC_Handle_8(hcrc, (uint8_t*)pBuffer, BufferLength);
break;
case CRC_INPUTDATA_FORMAT_HALFWORDS:
/* Specific 16-bit input data handling */
temp = CRC_Handle_16(hcrc, (uint16_t*)pBuffer, BufferLength);
break;
default:
break;
}
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_READY;
/* Process unlocked */
__HAL_UNLOCK(hcrc);
/* Return the CRC computed value */
return temp;
}
