HAL_RTCEx_SetWakeUpTimer_IT issue (STM32L475RC)

[adrian]

Hi,

I'm really struggling with this, I cannot find any reason for the problem I'm seeing, I've looked at the example code in the firmware packages and I have identical code to the examples.

I'm using HAL to configure the project, the RTC is clocked from LSE which is up and running.

I call:

    MX_RTC_Init();

And I can see that the registers change as expected.

I then call:

 HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);

HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 0x5000, RTC_WAKEUPCLOCK_RTCCLK_DIV16);

Which should result the RTC_WKUP_IRQHandler being called, but it never is.

If I look after 10 seconds at the RTC status registers I can see that WUTF is set.

I've tried adding:

__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);

In various places as it seems that may be required after reading around, but it makes no difference, I cannot get the interrupt to fire, other interrupts from other peripherals are working fine.

My HAL_RTC_MspInit has the following code:

  __HAL_RCC_RTC_ENABLE();

 HAL_NVIC_SetPriority(RTC_WKUP_IRQn, 0, 0);

 HAL_NVIC_EnableIRQ(RTC_WKUP_IRQn);

Any suggestions?

[adrian]

void main(void)
{
	HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
 
	SystemClock_Config();
	HAL_Init();
	MX_RTC_Init();
 
	HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);
	__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);
 
	HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 1000, RTC_WAKEUPCLOCK_RTCCLK_DIV16);
	
	while(1);
}
 
void RTC_WKUP_IRQHandler(void)
{
	HAL_RTCEx_WakeUpTimerIRQHandler(&hrtc);
}

I literally have this as the application with a breakpoint set in RTC_WKUP_IRQHandler and it doesn't get there. I'm absolutely baffled.

[adrian]

Bump, anybody?

[adrian]

ST Staff?

[adrian]

I've now duplicated the code from the example and it still doesn't work.

What am I missing here?

[waclawek.jan]

RTC_CR.WUTIE is set?

Is the corresponding EXTI line configured for proper (rising) edge and enabled in EXTI?

Check by reading out the appropriate registers content.

JW

[adrian]

@Community member​ 

I assume you meant WUTE, yes that's enabled.

The EXTI is set correctly.

[waclawek.jan]

No, I mean WUTIE,

JW

[adrian]

Sorry, I didn't see it in my list - been staring at this way too long.

Yep, it's set.

[waclawek.jan]

I don't know, then. Sorry.

JW