Bug in HAL driver for STM32L432 RTC wakeup

[Peter Mather]

The RTC wakeup interrupt uses EXTI-20. Unfortunately the HAL drivers do not properly enable the interrupt. Adding

EXTI->IMR1|=(1<<20);

after HAL_RTCEx_SetWakeUpTimer_IT fixes the issue

[After Forever]

If you are using STM32CubeMX you should enable it there before generating the code - enable the RTC Clock Source, RTC Calendar, RTC Internal WakeUp, then go to the Confguration tab, and enable the RTC wakeup interrupt in the RTC's NVIC Settings tab.

[Peter Mather]

I did and it doesn't - that is the problem

[kerya33]

Hi, for STM32Cube_FW_L0_V1.11.2 in stm32l4xx_hal_rtc_ex.c

must fixes

HAL_StatusTypeDef HAL_RTCEx_SetWakeUpTimer_IT(RTC_HandleTypeDef *hrtc, uint32_t WakeUpCounter, uint32_t WakeUpClock)

...

#if defined(STM32L412xx) || defined(STM32L422xx)

 /* In case of WUT autoclr, the IRQ handler should not be called */

 if (WakeUpAutoClr != 0u)

 {

  /* RTC WakeUpTimer EXTI Configuration: Event configuration */

  __HAL_RTC_WAKEUPTIMER_EXTI_ENABLE_EVENT();

 }

 else

 {

  /* RTC WakeUpTimer EXTI Configuration: Interrupt configuration */

  __HAL_RTC_WAKEUPTIMER_EXTI_ENABLE_IT();

 }

#else /* defined(STM32L412xx) || defined(STM32L422xx) */

__HAL_RTC_WAKEUPTIMER_EXTI_ENABLE_EVENT(); /* this bug*/

 __HAL_RTC_WAKEUPTIMER_EXTI_ENABLE_IT();

#endif /* defined(STM32L412xx) || defined(STM32L422xx) */

[kerya33]

Excuse me, in previos post must be

STM32Cube_FW_L4_V1.13.0