LPTIM Private Functions

Functions
void	LPTIM_Disable (LPTIM_HandleTypeDef *lptim)
	Disable LPTIM HW instance. More...
static void	LPTIM_ResetCallback (LPTIM_HandleTypeDef *lptim)
	Reset interrupt callbacks to the legacy weak callbacks. More...

Detailed Description

Function Documentation

LPTIM_Disable()

void LPTIM_Disable

(

LPTIM_HandleTypeDef *

lptim

)

Disable LPTIM HW instance.

Parameters

lptim

pointer to a LPTIM_HandleTypeDef structure that contains the configuration information for LPTIM module.

Note

The following sequence is required to solve LPTIM disable HW limitation. Please check Errata Sheet ES0335 for more details under "MCU may remain stuck in LPTIM interrupt when entering Stop mode" section.

Return values

None

Definition at line 2224 of file stm32l4xx_hal_lptim.c.

{
  uint32_t tmpclksource = 0;
  uint32_t tmpIER;
  uint32_t tmpCFGR;
  uint32_t tmpCMP;
  uint32_t tmpARR;
  uint32_t tmpOR;

  __disable_irq();

  /*********** Save LPTIM Config ***********/
  /* Save LPTIM source clock */
  switch ((uint32_t)lptim->Instance)
  {
     case LPTIM1_BASE:
       tmpclksource = __HAL_RCC_GET_LPTIM1_SOURCE();
       break;
#if defined(LPTIM2)
     case LPTIM2_BASE:
       tmpclksource = __HAL_RCC_GET_LPTIM2_SOURCE();
       break;
#endif /* LPTIM2 */
     default:
       break;
  }

  /* Save LPTIM configuration registers */
  tmpIER = lptim->Instance->IER;
  tmpCFGR = lptim->Instance->CFGR;
  tmpCMP = lptim->Instance->CMP;
  tmpARR = lptim->Instance->ARR;
  tmpOR = lptim->Instance->OR;

  /*********** Reset LPTIM ***********/
  switch ((uint32_t)lptim->Instance)
  {
     case LPTIM1_BASE:
       __HAL_RCC_LPTIM1_FORCE_RESET();
       __HAL_RCC_LPTIM1_RELEASE_RESET();
       break;
#if defined(LPTIM2)
     case LPTIM2_BASE:
       __HAL_RCC_LPTIM2_FORCE_RESET();
       __HAL_RCC_LPTIM2_RELEASE_RESET();
       break;
#endif /* LPTIM2 */
     default:
       break;
  }

  /*********** Restore LPTIM Config ***********/
  uint32_t Ref_Time;
  uint32_t Time_Elapsed;

  if ((tmpCMP != 0UL) || (tmpARR != 0UL))
  {
    /* Force LPTIM source kernel clock from APB */
    switch ((uint32_t)lptim->Instance)
    {
       case LPTIM1_BASE:
         __HAL_RCC_LPTIM1_CONFIG(RCC_LPTIM1CLKSOURCE_PCLK1);
         break;
#if defined(LPTIM2)
       case LPTIM2_BASE:
         __HAL_RCC_LPTIM2_CONFIG(RCC_LPTIM2CLKSOURCE_PCLK1);
         break;
#endif /* LPTIM2 */
       default:
         break;
    }

    if (tmpCMP != 0UL)
    {
      /* Restore CMP register (LPTIM should be enabled first) */
      lptim->Instance->CR |= LPTIM_CR_ENABLE;
      lptim->Instance->CMP = tmpCMP;
      /* Polling on CMP write ok status after above restore operation */
      Ref_Time = HAL_GetTick();
      do
      {
        Time_Elapsed = HAL_GetTick() - Ref_Time;
      } while ((!(__HAL_LPTIM_GET_FLAG(lptim, LPTIM_FLAG_CMPOK))) && (Time_Elapsed <= TIMEOUT));

      __HAL_LPTIM_CLEAR_FLAG(lptim, LPTIM_FLAG_CMPOK);
    }

    if (tmpARR != 0UL)
    {
      /* Restore ARR register (LPTIM should be enabled first) */
      lptim->Instance->CR |= LPTIM_CR_ENABLE;
      lptim->Instance->ARR = tmpARR;
      /* Polling on ARR write ok status after above restore operation */
      Ref_Time = HAL_GetTick();
      do
      {
        Time_Elapsed = HAL_GetTick() - Ref_Time;
      } while ((!(__HAL_LPTIM_GET_FLAG(lptim, LPTIM_FLAG_ARROK))) && (Time_Elapsed <= TIMEOUT));

      __HAL_LPTIM_CLEAR_FLAG(lptim, LPTIM_FLAG_ARROK);
    }

    /* Restore LPTIM source kernel clock */
    switch ((uint32_t)lptim->Instance)
    {
       case LPTIM1_BASE:
         __HAL_RCC_LPTIM1_CONFIG(tmpclksource);
         break;
#if defined(LPTIM2)
       case LPTIM2_BASE:
         __HAL_RCC_LPTIM2_CONFIG(tmpclksource);
         break;
#endif /* LPTIM2 */
       default:
         break;
    }
  }

  /* Restore configuration registers (LPTIM should be disabled first) */
  lptim->Instance->CR &= ~(LPTIM_CR_ENABLE);
  lptim->Instance->IER = tmpIER;
  lptim->Instance->CFGR = tmpCFGR;
  lptim->Instance->OR = tmpOR;

  __enable_irq();
}

LPTIM_ResetCallback()

static void LPTIM_ResetCallback ( LPTIM_HandleTypeDef *  lptim )

static

Reset interrupt callbacks to the legacy weak callbacks.

Parameters

lptim

pointer to a LPTIM_HandleTypeDef structure that contains the configuration information for LPTIM module.

Return values

None

Definition at line 2198 of file stm32l4xx_hal_lptim.c.

{
  /* Reset the LPTIM callback to the legacy weak callbacks */
  lptim->CompareMatchCallback    = HAL_LPTIM_CompareMatchCallback;    /* Compare match Callback                       */
  lptim->AutoReloadMatchCallback = HAL_LPTIM_AutoReloadMatchCallback; /* Auto-reload match Callback                   */
  lptim->TriggerCallback         = HAL_LPTIM_TriggerCallback;         /* External trigger event detection Callback    */
  lptim->CompareWriteCallback    = HAL_LPTIM_CompareWriteCallback;    /* Compare register write complete Callback     */
  lptim->AutoReloadWriteCallback = HAL_LPTIM_AutoReloadWriteCallback; /* Auto-reload register write complete Callback */
  lptim->DirectionUpCallback     = HAL_LPTIM_DirectionUpCallback;     /* Up-counting direction change Callback        */
  lptim->DirectionDownCallback   = HAL_LPTIM_DirectionDownCallback;   /* Down-counting direction change Callback      */
#if defined(LPTIM_RCR_REP)
  lptim->UpdateEventCallback     = HAL_LPTIM_UpdateEventCallback;     /* Update Event Callback                        */
  lptim->RepCounterWriteCallback = HAL_LPTIM_RepCounterWriteCallback; /* Repetition counter successful write Callback */
#endif /* LPTIM_RCR_REP */
}