コード例 #1
0
/**
  * @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;
}
コード例 #2
0
ファイル: stm32f3xx_hal_crc.c プロジェクト: 23chrischen/mbed
/**
  * @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;
}