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STM32F446RE - RTC time drift under "heavy" load of wake up's and standby mode

Question asked by David Lichterov on Dec 10, 2017
Latest reply on Dec 11, 2017 by David Lichterov

Hey,

I am trying to test my MCU with the sequence bellow in order to check if i get time drift on the RTC clock.

loop on :

1. print RTC time + date

2.  enter stand by mode

 

I tested the wake up from stand by mode with :

1. ALARM every 5 seconds

2. rising edge on the WKUP pin

 

This sequence make's the RTC clock drift almost immediately and the drift is getting larger and larger as the time passes ( I print the RTC clock and compare it to a stop watch).

 

Am i doing some thing wrong that causes this issue ? I would be happy to supply any parts of the code if needed.

 

Thanks !

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