Posted on September 08, 2016 at 20:10>
Post content of relevant registers at that point.
Which ones would you like? I posted the specific parts of registers I thought were relevant already but I can post the contents of any registers you'd like.
> Since the code that you provided managed RTC for more than one device, it is not so obvious to identify the root cause. Try to clear and keep only RTC part in a new main.
It's just anything that is ifdef'd STM32F4 and not ifdef'd STM32F1. I know it's a little frustrating but it might also help knowing that it works on F1 but not F4 - and you'd lose that if I deleted the ifdefs for you.
> Assynchronous and Synchronous predivs setting for the STM32F4 case
Do these get cleared when the backup register flags are set? Also, I'd have thought they would only be able to change the speed of the RTC, not stop it completely which appears to be what's happening?
> Why you are setting alarm with STM32F1 and WUT in case of STM32F4 ? Is RTC not supposed to behave the same ?
I didn't think the F1 had a wake up timer? I can't use an alarm on the F4 because I want higher accuracy than 1 second on F4 (it doesn't seem possible on F1).
Even so, that shouldn't be relevant here as it's broken long before that point. It's literally just the two areas I pointed at.
Is there a way to set the RTC prescaler and clock source
without resetting everything first? That could make life a lot easier.
