WakeUp Event detect from STANDBY mode

Marco1 · ‎2017-10-20

Posted on October 20, 2017 at 16:51

I maked a little project with STM32F415, and i have 4 way to wakeup it from STANDBY mode.

1) PA0 Pin wake up

2) RTC Timer Wake Up

3) Tamper1 Wake up

4) RTC Alarm A and RTC Alarm B

For RTC Alarm i solved comparinging the time...but for others ?

Someone know a easy way to detect the event has 'wakeuped' it ?

Sorry for my english

Tesla DeLorean · ‎2017-10-20

Posted on October 20, 2017 at 17:30

Do they trigger different EXTI?

Don't all the RTC sources (Timer, Alarm, Tamper) flag?

Look at the GPIO state

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Vangelis Fortounas · ‎2017-10-20

Posted on October 20, 2017 at 17:36

Hello!

Inside RTC_ISR register you can check the appropriate flags to distinguish the source of RTC wakeup event.

To find if wake up was from WKUP PIN , if RTC wakeup sources are clear (after wakeup from stby mode ) then the wakeup source is from wakeup pin. (read the SBF and WUF flags inside PWR_CSR register).

Regards

vf