STM32F405 Locked in Standby mode when using more than one wakeup source

waltee1000 · ‎2015-12-28

Posted on December 29, 2015 at 02:18

I have been battling with a problem which blocks wakeup from Standby mode when using more than one wakeup source (RTC and Wakeup Pin PA0) this has already been identified and acknowledged by ST and the solution to the problem is provided in ''STM32F40x and STM32F41x Errata sheet Section 2.1.5

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/errata_sheet/DM00037591.pdf

#locked-in-standby-mode

Tesla DeLorean · ‎2015-12-28

Posted on December 29, 2015 at 06:15

Do you check if PA0 is asserted before you do this?

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waltee1000 · ‎2015-12-29

Posted on December 29, 2015 at 17:27

Hi Clive,

No, I didn't explicitly check if PA0 is asserted. Why is it needed to check if its asserted?

I assume its not asserted bcoz the peripheral that asserts PA0 right now is disconnected and even in this case the RTC doesn't get it out of standby after 60 seconds.

Thanks,

Walter

waltee1000 · ‎2015-12-29

Posted on December 29, 2015 at 17:44

Hi,

I read the PA0 and Yes it is set to 1 before I do the clearing of the flags.

Walter