RTC - [STM32CubeL4][1.13.0][stm32l4xx_hal_rtc_ex] Missing EXTI interrupt activation

[phlf]

Problem:

RTC Wakeup interrupt is not working on STM32L4 after calling the HAL_RTCEx_SetWakeUpTimer_IT.

Cause:

A preprocessor macro check rules out a call to the __HAL_RTC_WAKEUP_EXTI_ENABLE_IT for uC other than STM32L412xx / STM32L422xx in the file stm32l4xx_hal_rtc_ex.c

Fix:

Add a call to __HAL_RTC_WAKEUPTIMER_EXTI_ENABLE_IT just before __HAL_RTC_WAKEUPTIMER_EXTI_ENABLE_EVENT line 912:

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

becomes:

#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_IT();
    __HAL_RTC_WAKEUPTIMER_EXTI_ENABLE_EVENT();
#endif /* defined(STM32L412xx) || defined(STM32L422xx) */