/**
* @brief Initializes the CRC according to the specified
* parameters in the CRC_InitTypeDef and creates the associated handle.
* @param hcrc: CRC handle
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CRC_Init(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));
if(hcrc->State == HAL_CRC_STATE_RESET)
{
/* Init the low level hardware */
HAL_CRC_MspInit(hcrc);
}
hcrc->State = HAL_CRC_STATE_BUSY;
/* Extended initialization: if programmable polynomial feature is
applicable to device, set default or non-default generating
polynomial according to hcrc->Init parameters.
If feature is non-applicable to device in use, HAL_CRCEx_Init straight
away reports HAL_OK. */
if (HAL_CRCEx_Init(hcrc) != HAL_OK)
{
return HAL_ERROR;
}
/* check whether or not non-default CRC initial value has been
* picked up by user */
assert_param(IS_DEFAULT_INIT_VALUE(hcrc->Init.DefaultInitValueUse));
if (hcrc->Init.DefaultInitValueUse == DEFAULT_INIT_VALUE_ENABLE)
{
WRITE_REG(hcrc->Instance->INIT, DEFAULT_CRC_INITVALUE);
}
else
{
WRITE_REG(hcrc->Instance->INIT, hcrc->Init.InitValue);
}
/* set input data inversion mode */
assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(hcrc->Init.InputDataInversionMode));
MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, hcrc->Init.InputDataInversionMode);
/* set output data inversion mode */
assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(hcrc->Init.OutputDataInversionMode));
MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, hcrc->Init.OutputDataInversionMode);
/* makes sure the input data format (bytes, halfwords or words stream)
* is properly specified by user */
assert_param(IS_CRC_INPUTDATA_FORMAT(hcrc->InputDataFormat));
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_READY;
/* Return function status */
return HAL_OK;
}
/**
* @brief Initializes the CRC according to the specified
* parameters in the CRC_InitTypeDef and creates the associated handle.
* @param hcrc: CRC handle
* @retval HAL status
*/
HAL_StatusTypeDef HAL_CRC_Init(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));
if(hcrc->State == HAL_CRC_STATE_RESET)
{
/* Init the low level hardware */
HAL_CRC_MspInit(hcrc);
}
hcrc->State = HAL_CRC_STATE_BUSY;
/* check whether or not non-default generating polynomial has been
* picked up by user */
assert_param(IS_DEFAULT_POLYNOMIAL(hcrc->Init.DefaultPolynomialUse));
if (hcrc->Init.DefaultPolynomialUse == DEFAULT_POLYNOMIAL_ENABLE)
{
/* initialize IP with default generating polynomial */
WRITE_REG(hcrc->Instance->POL, DEFAULT_CRC32_POLY);
MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, CRC_POLYLENGTH_32B);
}
else
{
/* initialize CRC IP with generating polynomial defined by user */
if (HAL_CRCEx_Polynomial_Set(hcrc, hcrc->Init.GeneratingPolynomial, hcrc->Init.CRCLength) != HAL_OK)
{
return HAL_ERROR;
}
}
/* check whether or not non-default CRC initial value has been
* picked up by user */
assert_param(IS_DEFAULT_INIT_VALUE(hcrc->Init.DefaultInitValueUse));
if (hcrc->Init.DefaultInitValueUse == DEFAULT_INIT_VALUE_ENABLE)
{
WRITE_REG(hcrc->Instance->INIT, DEFAULT_CRC_INITVALUE);
}
else
{
WRITE_REG(hcrc->Instance->INIT, hcrc->Init.InitValue);
}
/* set input data inversion mode */
assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(hcrc->Init.InputDataInversionMode));
MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, hcrc->Init.InputDataInversionMode);
/* set output data inversion mode */
assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(hcrc->Init.OutputDataInversionMode));
MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, hcrc->Init.OutputDataInversionMode);
/* makes sure the input data format (bytes, halfwords or words stream)
* is properly specified by user */
assert_param(IS_CRC_INPUTDATA_FORMAT(hcrc->InputDataFormat));
/* Change CRC peripheral state */
hcrc->State = HAL_CRC_STATE_READY;
/* Return function status */
return HAL_OK;
}