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Duccio
Visitor II
January 26, 2024
Question

RTC WakeupTimer interrupt triggered immediately

  • January 26, 2024
  • 1 reply
  • 1412 views

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):

Duccio_0-1706269846573.png

Duccio_2-1706269875070.png

I am using LSE for rtc clock:

Duccio_3-1706269923006.png

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

Any hint will be appreciated :) 

This topic has been closed for replies.

1 reply

Pierre_Paris
Pierre_Paris
ST Employee
January 26, 2024

Hello @Duccio,

Thank you for your question!

Have a look on this thread. 

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

 RTC.PNG

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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