Initialization and de-initialization functions

Functions
ErrorStatus	LL_SPI_DeInit (SPI_TypeDef *SPIx)
	De-initialize the SPI registers to their default reset values. More...
ErrorStatus	LL_SPI_Init (SPI_TypeDef *SPIx, LL_SPI_InitTypeDef *SPI_InitStruct)
	Initialize the SPI registers according to the specified parameters in SPI_InitStruct. More...
void	LL_SPI_StructInit (LL_SPI_InitTypeDef *SPI_InitStruct)
	Set each LL_SPI_InitTypeDef field to default value. More...

Detailed Description

Function Documentation

LL_SPI_DeInit()

ErrorStatus LL_SPI_DeInit

(

SPI_TypeDef *

SPIx

)

De-initialize the SPI registers to their default reset values.

Parameters

SPIx	SPI Instance

Return values

An	ErrorStatus enumeration value: SUCCESS: SPI registers are de-initialized ERROR: SPI registers are not de-initialized

Definition at line 133 of file stm32l4xx_ll_spi.c.

{
  ErrorStatus status = ERROR;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_INSTANCE(SPIx));

#if defined(SPI1)
  if (SPIx == SPI1)
  {
    /* Force reset of SPI clock */
    LL_APB2_GRP1_ForceReset(LL_APB2_GRP1_PERIPH_SPI1);

    /* Release reset of SPI clock */
    LL_APB2_GRP1_ReleaseReset(LL_APB2_GRP1_PERIPH_SPI1);

    status = SUCCESS;
  }
#endif /* SPI1 */
#if defined(SPI2)
  if (SPIx == SPI2)
  {
    /* Force reset of SPI clock */
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_SPI2);

    /* Release reset of SPI clock */
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_SPI2);

    status = SUCCESS;
  }
#endif /* SPI2 */
#if defined(SPI3)
  if (SPIx == SPI3)
  {
    /* Force reset of SPI clock */
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_SPI3);

    /* Release reset of SPI clock */
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_SPI3);

    status = SUCCESS;
  }
#endif /* SPI3 */

  return status;
}

LL_SPI_Init()

ErrorStatus LL_SPI_Init	(	SPI_TypeDef *	SPIx,
		LL_SPI_InitTypeDef *	SPI_InitStruct
	)

Initialize the SPI registers according to the specified parameters in SPI_InitStruct.

Note

As some bits in SPI configuration registers can only be written when the SPI is disabled (SPI_CR1_SPE bit =0), SPI peripheral should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.

Parameters

SPIx	SPI Instance
SPI_InitStruct	pointer to a LL_SPI_InitTypeDef structure

Return values

An	ErrorStatus enumeration value. (Return always SUCCESS)

Definition at line 188 of file stm32l4xx_ll_spi.c.

{
  ErrorStatus status = ERROR;

  /* Check the SPI Instance SPIx*/
  assert_param(IS_SPI_ALL_INSTANCE(SPIx));

  /* Check the SPI parameters from SPI_InitStruct*/
  assert_param(IS_LL_SPI_TRANSFER_DIRECTION(SPI_InitStruct->TransferDirection));
  assert_param(IS_LL_SPI_MODE(SPI_InitStruct->Mode));
  assert_param(IS_LL_SPI_DATAWIDTH(SPI_InitStruct->DataWidth));
  assert_param(IS_LL_SPI_POLARITY(SPI_InitStruct->ClockPolarity));
  assert_param(IS_LL_SPI_PHASE(SPI_InitStruct->ClockPhase));
  assert_param(IS_LL_SPI_NSS(SPI_InitStruct->NSS));
  assert_param(IS_LL_SPI_BAUDRATE(SPI_InitStruct->BaudRate));
  assert_param(IS_LL_SPI_BITORDER(SPI_InitStruct->BitOrder));
  assert_param(IS_LL_SPI_CRCCALCULATION(SPI_InitStruct->CRCCalculation));

  if (LL_SPI_IsEnabled(SPIx) == 0x00000000U)
  {
    /*---------------------------- SPIx CR1 Configuration ------------------------
     * Configure SPIx CR1 with parameters:
     * - TransferDirection:  SPI_CR1_BIDIMODE, SPI_CR1_BIDIOE and SPI_CR1_RXONLY bits
     * - Master/Slave Mode:  SPI_CR1_MSTR bit
     * - ClockPolarity:      SPI_CR1_CPOL bit
     * - ClockPhase:         SPI_CR1_CPHA bit
     * - NSS management:     SPI_CR1_SSM bit
     * - BaudRate prescaler: SPI_CR1_BR[2:0] bits
     * - BitOrder:           SPI_CR1_LSBFIRST bit
     * - CRCCalculation:     SPI_CR1_CRCEN bit
     */
    MODIFY_REG(SPIx->CR1,
               SPI_CR1_CLEAR_MASK,
               SPI_InitStruct->TransferDirection | SPI_InitStruct->Mode |
               SPI_InitStruct->ClockPolarity | SPI_InitStruct->ClockPhase |
               SPI_InitStruct->NSS | SPI_InitStruct->BaudRate |
               SPI_InitStruct->BitOrder | SPI_InitStruct->CRCCalculation);

    /*---------------------------- SPIx CR2 Configuration ------------------------
     * Configure SPIx CR2 with parameters:
     * - DataWidth:          DS[3:0] bits
     * - NSS management:     SSOE bit
     */
    MODIFY_REG(SPIx->CR2,
               SPI_CR2_DS | SPI_CR2_SSOE,
               SPI_InitStruct->DataWidth | (SPI_InitStruct->NSS >> 16U));

    /*---------------------------- SPIx CRCPR Configuration ----------------------
     * Configure SPIx CRCPR with parameters:
     * - CRCPoly:            CRCPOLY[15:0] bits
     */
    if (SPI_InitStruct->CRCCalculation == LL_SPI_CRCCALCULATION_ENABLE)
    {
      assert_param(IS_LL_SPI_CRC_POLYNOMIAL(SPI_InitStruct->CRCPoly));
      LL_SPI_SetCRCPolynomial(SPIx, SPI_InitStruct->CRCPoly);
    }
    status = SUCCESS;
  }

  return status;
}

LL_SPI_StructInit()

void LL_SPI_StructInit

(

LL_SPI_InitTypeDef *

SPI_InitStruct

)

Set each LL_SPI_InitTypeDef field to default value.

Parameters

SPI_InitStruct

pointer to a LL_SPI_InitTypeDef structure whose fields will be set to default values.

Return values

None

Definition at line 256 of file stm32l4xx_ll_spi.c.

{
  /* Set SPI_InitStruct fields to default values */
  SPI_InitStruct->TransferDirection = LL_SPI_FULL_DUPLEX;
  SPI_InitStruct->Mode              = LL_SPI_MODE_SLAVE;
  SPI_InitStruct->DataWidth         = LL_SPI_DATAWIDTH_8BIT;
  SPI_InitStruct->ClockPolarity     = LL_SPI_POLARITY_LOW;
  SPI_InitStruct->ClockPhase        = LL_SPI_PHASE_1EDGE;
  SPI_InitStruct->NSS               = LL_SPI_NSS_HARD_INPUT;
  SPI_InitStruct->BaudRate          = LL_SPI_BAUDRATEPRESCALER_DIV2;
  SPI_InitStruct->BitOrder          = LL_SPI_MSB_FIRST;
  SPI_InitStruct->CRCCalculation    = LL_SPI_CRCCALCULATION_DISABLE;
  SPI_InitStruct->CRCPoly           = 7U;
}