Extended Initialization/de-initialization functions

Extended Initialization and Configuration functions. More...

Functions
HAL_StatusTypeDef	HAL_CRCEx_Polynomial_Set (CRC_HandleTypeDef *hcrc, uint32_t Pol, uint32_t PolyLength)
	Initialize the CRC polynomial if different from default one. More...
HAL_StatusTypeDef	HAL_CRCEx_Input_Data_Reverse (CRC_HandleTypeDef *hcrc, uint32_t InputReverseMode)
	Set the Reverse Input data mode. More...
HAL_StatusTypeDef	HAL_CRCEx_Output_Data_Reverse (CRC_HandleTypeDef *hcrc, uint32_t OutputReverseMode)
	Set the Reverse Output data mode. More...

Detailed Description

Extended Initialization and Configuration functions.

 ===============================================================================
            ##### Extended configuration functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Configure the generating polynomial
      (+) Configure the input data inversion
      (+) Configure the output data inversion

Function Documentation

HAL_CRCEx_Input_Data_Reverse()

HAL_StatusTypeDef HAL_CRCEx_Input_Data_Reverse	(	CRC_HandleTypeDef *	hcrc,
		uint32_t	InputReverseMode
	)

Set the Reverse Input data mode.

Parameters

hcrc	CRC handle
InputReverseMode	Input Data inversion mode. This parameter can be one of the following values: CRC_INPUTDATA_INVERSION_NONE no change in bit order (default value) CRC_INPUTDATA_INVERSION_BYTE Byte-wise bit reversal CRC_INPUTDATA_INVERSION_HALFWORD HalfWord-wise bit reversal CRC_INPUTDATA_INVERSION_WORD Word-wise bit reversal

Return values

HAL

status

Definition at line 159 of file stm32l4xx_hal_crc_ex.c.

{
  /* Check the parameters */
  assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(InputReverseMode));

  /* Change CRC peripheral state */
  hcrc->State = HAL_CRC_STATE_BUSY;

  /* set input data inversion mode */
  MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, InputReverseMode);
  /* Change CRC peripheral state */
  hcrc->State = HAL_CRC_STATE_READY;

  /* Return function status */
  return HAL_OK;
}

HAL_CRCEx_Output_Data_Reverse()

HAL_StatusTypeDef HAL_CRCEx_Output_Data_Reverse	(	CRC_HandleTypeDef *	hcrc,
		uint32_t	OutputReverseMode
	)

Set the Reverse Output data mode.

Parameters

hcrc	CRC handle
OutputReverseMode	Output Data inversion mode. This parameter can be one of the following values: CRC_OUTPUTDATA_INVERSION_DISABLE no CRC inversion (default value) CRC_OUTPUTDATA_INVERSION_ENABLE bit-level inversion (e.g. for a 8-bit CRC: 0xB5 becomes 0xAD)

Return values

HAL

status

Definition at line 185 of file stm32l4xx_hal_crc_ex.c.

{
  /* Check the parameters */
  assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(OutputReverseMode));

  /* Change CRC peripheral state */
  hcrc->State = HAL_CRC_STATE_BUSY;

  /* set output data inversion mode */
  MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, OutputReverseMode);

  /* Change CRC peripheral state */
  hcrc->State = HAL_CRC_STATE_READY;

  /* Return function status */
  return HAL_OK;
}

HAL_CRCEx_Polynomial_Set()

HAL_StatusTypeDef HAL_CRCEx_Polynomial_Set	(	CRC_HandleTypeDef *	hcrc,
		uint32_t	Pol,
		uint32_t	PolyLength
	)

Initialize the CRC polynomial if different from default one.

Parameters

hcrc	CRC handle
Pol	CRC generating polynomial (7, 8, 16 or 32-bit long). This parameter is written in normal representation, e.g. for a polynomial of degree 7, X^7 + X^6 + X^5 + X^2 + 1 is written 0x65 for a polynomial of degree 16, X^16 + X^12 + X^5 + 1 is written 0x1021
PolyLength	CRC polynomial length. This parameter can be one of the following values: CRC_POLYLENGTH_7B 7-bit long CRC (generating polynomial of degree 7) CRC_POLYLENGTH_8B 8-bit long CRC (generating polynomial of degree 8) CRC_POLYLENGTH_16B 16-bit long CRC (generating polynomial of degree 16) CRC_POLYLENGTH_32B 32-bit long CRC (generating polynomial of degree 32)

Return values

HAL

status

Definition at line 89 of file stm32l4xx_hal_crc_ex.c.

{
  HAL_StatusTypeDef status = HAL_OK;
  uint32_t msb = 31U; /* polynomial degree is 32 at most, so msb is initialized to max value */

  /* Check the parameters */
  assert_param(IS_CRC_POL_LENGTH(PolyLength));

  /* check polynomial definition vs polynomial size:
   * polynomial length must be aligned with polynomial
   * definition. HAL_ERROR is reported if Pol degree is
   * larger than that indicated by PolyLength.
   * Look for MSB position: msb will contain the degree of
   *  the second to the largest polynomial member. E.g., for
   *  X^7 + X^6 + X^5 + X^2 + 1, msb = 6. */
  while ((msb-- > 0U) && ((Pol & ((uint32_t)(0x1U) << (msb & 0x1FU))) == 0U))
  {
  }

  switch (PolyLength)
  {
    case CRC_POLYLENGTH_7B:
      if (msb >= HAL_CRC_LENGTH_7B)
      {
        status =   HAL_ERROR;
      }
      break;
    case CRC_POLYLENGTH_8B:
      if (msb >= HAL_CRC_LENGTH_8B)
      {
        status =   HAL_ERROR;
      }
      break;
    case CRC_POLYLENGTH_16B:
      if (msb >= HAL_CRC_LENGTH_16B)
      {
        status =   HAL_ERROR;
      }
      break;

    case CRC_POLYLENGTH_32B:
      /* no polynomial definition vs. polynomial length issue possible */
      break;
    default:
      status =  HAL_ERROR;
      break;
  }
  if (status == HAL_OK)
  {
    /* set generating polynomial */
    WRITE_REG(hcrc->Instance->POL, Pol);

    /* set generating polynomial size */
    MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, PolyLength);
  }
  /* Return function status */
  return status;
}