Possible to improve accuracy of timer/ticker?

Mbed OS
1

Hi,

I just realized the 10 minutes ticker I set up on STM32F429ZI is off by 7 seconds for every 10 minutes interval. Is there any way to improve the accuracy? Something like 1 ~ 2 seconds every 10 minutes?

It would be nice if we use interrupt from RTC, but this doesn’t seem possible as of now.

Thanks.

2

but the RTC is supported in F4, so reading the RTC in slow intervalls should work without performance impact?

3

Yes, this is an alternative. I guess I will use a combination of ticker and then poll RTC time to ensure time accuracy.