RTC WakeupTimer interrupt triggered immediately

Duccio · ‎2024-01-26

Hello everyone,

I'm working on a NUCLEO board (stm32wba52cg) and currently testing some of the baord's features, but i'm facing a strange problem with RTC. Problem is that the Interrupt of the wakeupTimer start firing immediatly after its initialization, then the program get stuck in a loop of infinite RTC IRQs (see the atteached screenshots):

I am using LSE for rtc clock:

if i try to disable the irqs then the interrupt fires again on __enable_irq()

Any hint will be appreciated 🙂

Pierre_Paris · ‎2024-01-26

Hello @Duccio,

Thank you for your question!

Have a look on this thread.

Also, I join you the RTC interrupts array in RM0493.

For the timer peripherals in their default configuration, the prescaler and counter are "pre-loaded" via a shadow register, which means that when you write new prescaler and auto-reload values (PSC and ARR) the new values do not take effect until the next "update event". (See page 1043 of RM)

Best Regards,

Pierre

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