How to configure the RTC in stm32wb?

[anoli]

Hey everyone,

I'm using a stm32wb55 nucleo board.

When i'm using ST example about RTC, i have a problem with the accuracy of RTC and i want to know how i can configure RTC for increase her accurancy?

I.E.: all of 10 minutes i lose 6 seconds

Thanks in advance for any help.

[Uwe Bonnes]

Does it lose time in a step or continuous? Do you run with LSE or some other clock? Why don't you give more information? In general, check your code and quarz!

[anoli]

It lose time in continuous and i use this clock configuration:

[Uwe Bonnes]

So check the quarz. Maybe it is 32 k and not 2^15. Or maybe the load capacitance is far off. Or it is broken...