Initialization and de-initialization functions

Functions
ErrorStatus	LL_GPIO_DeInit (GPIO_TypeDef *GPIOx)
	De-initialize GPIO registers (Registers restored to their default values). More...
ErrorStatus	LL_GPIO_Init (GPIO_TypeDef *GPIOx, LL_GPIO_InitTypeDef *GPIO_InitStruct)
	Initialize GPIO registers according to the specified parameters in GPIO_InitStruct. More...
void	LL_GPIO_StructInit (LL_GPIO_InitTypeDef *GPIO_InitStruct)
	Set each LL_GPIO_InitTypeDef field to default value. More...

Detailed Description

Function Documentation

LL_GPIO_DeInit()

ErrorStatus LL_GPIO_DeInit

(

GPIO_TypeDef *

GPIOx

)

De-initialize GPIO registers (Registers restored to their default values).

Parameters

GPIOx

GPIO Port

Return values

An	ErrorStatus enumeration value: SUCCESS: GPIO registers are de-initialized ERROR: Wrong GPIO Port

Definition at line 109 of file stm32l4xx_ll_gpio.c.

{
  ErrorStatus status = SUCCESS;

  /* Check the parameters */
  assert_param(IS_GPIO_ALL_INSTANCE(GPIOx));

  /* Force and Release reset on clock of GPIOx Port */
  if (GPIOx == GPIOA)
  {
    LL_AHB2_GRP1_ForceReset(LL_AHB2_GRP1_PERIPH_GPIOA);
    LL_AHB2_GRP1_ReleaseReset(LL_AHB2_GRP1_PERIPH_GPIOA);
  }
  else if (GPIOx == GPIOB)
  {
    LL_AHB2_GRP1_ForceReset(LL_AHB2_GRP1_PERIPH_GPIOB);
    LL_AHB2_GRP1_ReleaseReset(LL_AHB2_GRP1_PERIPH_GPIOB);
  }
  else if (GPIOx == GPIOC)
  {
    LL_AHB2_GRP1_ForceReset(LL_AHB2_GRP1_PERIPH_GPIOC);
    LL_AHB2_GRP1_ReleaseReset(LL_AHB2_GRP1_PERIPH_GPIOC);
  }
#if defined(GPIOD)
  else if (GPIOx == GPIOD)
  {
    LL_AHB2_GRP1_ForceReset(LL_AHB2_GRP1_PERIPH_GPIOD);
    LL_AHB2_GRP1_ReleaseReset(LL_AHB2_GRP1_PERIPH_GPIOD);
  }
#endif /* GPIOD */
#if defined(GPIOE)
  else if (GPIOx == GPIOE)
  {
    LL_AHB2_GRP1_ForceReset(LL_AHB2_GRP1_PERIPH_GPIOE);
    LL_AHB2_GRP1_ReleaseReset(LL_AHB2_GRP1_PERIPH_GPIOE);
  }
#endif /* GPIOE */
#if defined(GPIOF)
  else if (GPIOx == GPIOF)
  {
    LL_AHB2_GRP1_ForceReset(LL_AHB2_GRP1_PERIPH_GPIOF);
    LL_AHB2_GRP1_ReleaseReset(LL_AHB2_GRP1_PERIPH_GPIOF);
  }
#endif /* GPIOF */
#if defined(GPIOG)
  else if (GPIOx == GPIOG)
  {
    LL_AHB2_GRP1_ForceReset(LL_AHB2_GRP1_PERIPH_GPIOG);
    LL_AHB2_GRP1_ReleaseReset(LL_AHB2_GRP1_PERIPH_GPIOG);
  }
#endif /* GPIOG */
#if defined(GPIOH)
  else if (GPIOx == GPIOH)
  {
    LL_AHB2_GRP1_ForceReset(LL_AHB2_GRP1_PERIPH_GPIOH);
    LL_AHB2_GRP1_ReleaseReset(LL_AHB2_GRP1_PERIPH_GPIOH);
  }
#endif /* GPIOH */
#if defined(GPIOI)
  else if (GPIOx == GPIOI)
  {
    LL_AHB2_GRP1_ForceReset(LL_AHB2_GRP1_PERIPH_GPIOI);
    LL_AHB2_GRP1_ReleaseReset(LL_AHB2_GRP1_PERIPH_GPIOI);
  }
#endif /* GPIOI */
  else
  {
    status = ERROR;
  }

  return (status);
}

LL_GPIO_Init()

ErrorStatus LL_GPIO_Init	(	GPIO_TypeDef *	GPIOx,
		LL_GPIO_InitTypeDef *	GPIO_InitStruct
	)

Initialize GPIO registers according to the specified parameters in GPIO_InitStruct.

Parameters

GPIOx	GPIO Port
GPIO_InitStruct	pointer to a LL_GPIO_InitTypeDef structure that contains the configuration information for the specified GPIO peripheral.

Return values

An	ErrorStatus enumeration value: SUCCESS: GPIO registers are initialized according to GPIO_InitStruct content ERROR: Not applicable

Definition at line 191 of file stm32l4xx_ll_gpio.c.

{
  uint32_t pinpos;
  uint32_t currentpin;

  /* Check the parameters */
  assert_param(IS_GPIO_ALL_INSTANCE(GPIOx));
  assert_param(IS_LL_GPIO_PIN(GPIO_InitStruct->Pin));
  assert_param(IS_LL_GPIO_MODE(GPIO_InitStruct->Mode));
  assert_param(IS_LL_GPIO_PULL(GPIO_InitStruct->Pull));

  /* ------------------------- Configure the port pins ---------------- */
  /* Initialize  pinpos on first pin set */
  pinpos = POSITION_VAL(GPIO_InitStruct->Pin);

  /* Configure the port pins */
  while (((GPIO_InitStruct->Pin) >> pinpos) != 0x00u)
  {
    /* Get current io position */
    currentpin = (GPIO_InitStruct->Pin) & (0x00000001uL << pinpos);

    if (currentpin != 0x00u)
    {
      /* Pin Mode configuration */
      LL_GPIO_SetPinMode(GPIOx, currentpin, GPIO_InitStruct->Mode);

      if ((GPIO_InitStruct->Mode == LL_GPIO_MODE_OUTPUT) || (GPIO_InitStruct->Mode == LL_GPIO_MODE_ALTERNATE))
      {
        /* Check Speed mode parameters */
        assert_param(IS_LL_GPIO_SPEED(GPIO_InitStruct->Speed));

        /* Speed mode configuration */
        LL_GPIO_SetPinSpeed(GPIOx, currentpin, GPIO_InitStruct->Speed);
      }

      /* Pull-up Pull down resistor configuration*/
      LL_GPIO_SetPinPull(GPIOx, currentpin, GPIO_InitStruct->Pull);

      if (GPIO_InitStruct->Mode == LL_GPIO_MODE_ALTERNATE)
      {
        /* Check Alternate parameter */
        assert_param(IS_LL_GPIO_ALTERNATE(GPIO_InitStruct->Alternate));

        /* Speed mode configuration */
        if (currentpin < LL_GPIO_PIN_8)
        {
          LL_GPIO_SetAFPin_0_7(GPIOx, currentpin, GPIO_InitStruct->Alternate);
        }
        else
        {
          LL_GPIO_SetAFPin_8_15(GPIOx, currentpin, GPIO_InitStruct->Alternate);
        }
      }
    }
    pinpos++;
  }

  if ((GPIO_InitStruct->Mode == LL_GPIO_MODE_OUTPUT) || (GPIO_InitStruct->Mode == LL_GPIO_MODE_ALTERNATE))
  {
    /* Check Output mode parameters */
    assert_param(IS_LL_GPIO_OUTPUT_TYPE(GPIO_InitStruct->OutputType));

    /* Output mode configuration*/
    LL_GPIO_SetPinOutputType(GPIOx, GPIO_InitStruct->Pin, GPIO_InitStruct->OutputType);

  }
  return (SUCCESS);
}

LL_GPIO_StructInit()

void LL_GPIO_StructInit

(

LL_GPIO_InitTypeDef *

GPIO_InitStruct

)

Set each LL_GPIO_InitTypeDef field to default value.

Parameters

GPIO_InitStruct

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

Return values

None

Definition at line 267 of file stm32l4xx_ll_gpio.c.

{
  /* Reset GPIO init structure parameters values */
  GPIO_InitStruct->Pin        = LL_GPIO_PIN_ALL;
  GPIO_InitStruct->Mode       = LL_GPIO_MODE_ANALOG;
  GPIO_InitStruct->Speed      = LL_GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct->OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct->Pull       = LL_GPIO_PULL_NO;
  GPIO_InitStruct->Alternate  = LL_GPIO_AF_0;
}