User constants in End Node application

Anyone can explain me where do the following constants come from and what is their function in the RTC?

I am starting my own application and I would like to know if these values suit my own application.

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ST Employee

Hello,

These constants are prescalers used to perform time operations

The constant RTC_N_PREDIV_S and RTC_PREDIV_S are used when you want to get the time to calculate the second and millisecond.

For RTC_PREDIV_A is used to increment the calendar value with a frequency of 1 Hz

I suggest you to check the section relative to RTC in the reference manual of your board for more information about those two variables.

Best regards