Peripheral Control functions

Peripheral Control functions. More...

Functions
HAL_StatusTypeDef	HAL_RTC_WaitForSynchro (RTC_HandleTypeDef *hrtc)
	Wait until the RTC Time and Date registers (RTC_TR and RTC_DR) are synchronized with RTC APB clock. More...

Detailed Description

Peripheral Control functions.

 ===============================================================================
                     ##### Peripheral Control functions #####
 ===============================================================================
    [..]
    This subsection provides functions allowing to
      (+) Wait for RTC Time and Date Synchronization

Function Documentation

HAL_RTC_WaitForSynchro()

HAL_StatusTypeDef HAL_RTC_WaitForSynchro

(

RTC_HandleTypeDef *

hrtc

)

Wait until the RTC Time and Date registers (RTC_TR and RTC_DR) are synchronized with RTC APB clock.

Note

The RTC Resynchronization mode is write protected, use the __HAL_RTC_WRITEPROTECTION_DISABLE() before calling this function.

To read the calendar through the shadow registers after Calendar initialization, calendar update or after wakeup from low power modes the software must first clear the RSF flag. The software must then wait until it is set again before reading the calendar, which means that the calendar registers have been correctly copied into the RTC_TR and RTC_DR shadow registers.

Parameters

hrtc	RTC handle

Return values

HAL

status

Definition at line 1685 of file stm32l4xx_hal_rtc.c.

{
  uint32_t tickstart;

  /* Clear RSF flag */
#if defined(STM32L412xx) || defined(STM32L422xx)
  hrtc->Instance->ICSR &= (uint32_t)RTC_RSF_MASK;
#else
  hrtc->Instance->ISR &= (uint32_t)RTC_RSF_MASK;
#endif

  tickstart = HAL_GetTick();

  /* Wait the registers to be synchronised */
#if defined(STM32L412xx) || defined(STM32L422xx)
  while ((hrtc->Instance->ICSR & RTC_ICSR_RSF) == 0U)
#else
  while ((hrtc->Instance->ISR & RTC_ISR_RSF) == 0U)
#endif
  {
    if ((HAL_GetTick() - tickstart) > RTC_TIMEOUT_VALUE)
    {
      return HAL_TIMEOUT;
    }
  }

  return HAL_OK;
}