Initialization and de-initialization functions

Functions
ErrorStatus	LL_I2C_Init (I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct)
	Initialize the I2C registers according to the specified parameters in I2C_InitStruct. More...
ErrorStatus	LL_I2C_DeInit (I2C_TypeDef *I2Cx)
	De-initialize the I2C registers to their default reset values. More...
void	LL_I2C_StructInit (LL_I2C_InitTypeDef *I2C_InitStruct)
	Set each LL_I2C_InitTypeDef field to default value. More...

Detailed Description

Function Documentation

LL_I2C_DeInit()

ErrorStatus LL_I2C_DeInit

(

I2C_TypeDef *

I2Cx

)

De-initialize the I2C registers to their default reset values.

Parameters

I2Cx	I2C Instance.

Return values

An	ErrorStatus enumeration value: SUCCESS: I2C registers are de-initialized ERROR: I2C registers are not de-initialized

Definition at line 87 of file stm32l4xx_ll_i2c.c.

{
  ErrorStatus status = SUCCESS;

  /* Check the I2C Instance I2Cx */
  assert_param(IS_I2C_ALL_INSTANCE(I2Cx));

  if (I2Cx == I2C1)
  {
    /* Force reset of I2C clock */
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);

    /* Release reset of I2C clock */
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
  }
#if defined(I2C2)
  else if (I2Cx == I2C2)
  {
    /* Force reset of I2C clock */
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);

    /* Release reset of I2C clock */
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);

  }
#endif
  else if (I2Cx == I2C3)
  {
    /* Force reset of I2C clock */
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C3);

    /* Release reset of I2C clock */
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C3);
  }
#if defined(I2C4)
  else if (I2Cx == I2C4)
  {
    /* Force reset of I2C clock */
    LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_I2C4);

    /* Release reset of I2C clock */
    LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_I2C4);
  }
#endif
  else
  {
    status = ERROR;
  }

  return status;
}

LL_I2C_Init()

ErrorStatus LL_I2C_Init	(	I2C_TypeDef *	I2Cx,
		LL_I2C_InitTypeDef *	I2C_InitStruct
	)

Initialize the I2C registers according to the specified parameters in I2C_InitStruct.

Parameters

I2Cx	I2C Instance.
I2C_InitStruct	pointer to a LL_I2C_InitTypeDef structure.

Return values

An	ErrorStatus enumeration value: SUCCESS: I2C registers are initialized ERROR: Not applicable

Definition at line 147 of file stm32l4xx_ll_i2c.c.

{
  /* Check the I2C Instance I2Cx */
  assert_param(IS_I2C_ALL_INSTANCE(I2Cx));

  /* Check the I2C parameters from I2C_InitStruct */
  assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
  assert_param(IS_LL_I2C_ANALOG_FILTER(I2C_InitStruct->AnalogFilter));
  assert_param(IS_LL_I2C_DIGITAL_FILTER(I2C_InitStruct->DigitalFilter));
  assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
  assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
  assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));

  /* Disable the selected I2Cx Peripheral */
  LL_I2C_Disable(I2Cx);

  /*---------------------------- I2Cx CR1 Configuration ------------------------
   * Configure the analog and digital noise filters with parameters :
   * - AnalogFilter: I2C_CR1_ANFOFF bit
   * - DigitalFilter: I2C_CR1_DNF[3:0] bits
   */
  LL_I2C_ConfigFilters(I2Cx, I2C_InitStruct->AnalogFilter, I2C_InitStruct->DigitalFilter);

  /*---------------------------- I2Cx TIMINGR Configuration --------------------
   * Configure the SDA setup, hold time and the SCL high, low period with parameter :
   * - Timing: I2C_TIMINGR_PRESC[3:0], I2C_TIMINGR_SCLDEL[3:0], I2C_TIMINGR_SDADEL[3:0],
   *           I2C_TIMINGR_SCLH[7:0] and I2C_TIMINGR_SCLL[7:0] bits
   */
  LL_I2C_SetTiming(I2Cx, I2C_InitStruct->Timing);

  /* Enable the selected I2Cx Peripheral */
  LL_I2C_Enable(I2Cx);

  /*---------------------------- I2Cx OAR1 Configuration -----------------------
   * Disable, Configure and Enable I2Cx device own address 1 with parameters :
   * - OwnAddress1:  I2C_OAR1_OA1[9:0] bits
   * - OwnAddrSize:  I2C_OAR1_OA1MODE bit
   */
  LL_I2C_DisableOwnAddress1(I2Cx);
  LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);

  /* OwnAdress1 == 0 is reserved for General Call address */
  if (I2C_InitStruct->OwnAddress1 != 0U)
  {
    LL_I2C_EnableOwnAddress1(I2Cx);
  }

  /*---------------------------- I2Cx MODE Configuration -----------------------
  * Configure I2Cx peripheral mode with parameter :
   * - PeripheralMode: I2C_CR1_SMBDEN and I2C_CR1_SMBHEN bits
   */
  LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);

  /*---------------------------- I2Cx CR2 Configuration ------------------------
   * Configure the ACKnowledge or Non ACKnowledge condition
   * after the address receive match code or next received byte with parameter :
   * - TypeAcknowledge: I2C_CR2_NACK bit
   */
  LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);

  return SUCCESS;
}

LL_I2C_StructInit()

void LL_I2C_StructInit

(

LL_I2C_InitTypeDef *

I2C_InitStruct

)

Set each LL_I2C_InitTypeDef field to default value.

Parameters

I2C_InitStruct

Pointer to a LL_I2C_InitTypeDef structure.

Return values

None

Definition at line 215 of file stm32l4xx_ll_i2c.c.

{
  /* Set I2C_InitStruct fields to default values */
  I2C_InitStruct->PeripheralMode  = LL_I2C_MODE_I2C;
  I2C_InitStruct->Timing          = 0U;
  I2C_InitStruct->AnalogFilter    = LL_I2C_ANALOGFILTER_ENABLE;
  I2C_InitStruct->DigitalFilter   = 0U;
  I2C_InitStruct->OwnAddress1     = 0U;
  I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
  I2C_InitStruct->OwnAddrSize     = LL_I2C_OWNADDRESS1_7BIT;
}