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RTC Calibration Woes!

Question asked by Grant Stocker on Feb 15, 2018

Hi! Working with the STM32F746ZG RTC. Clock, Calendar, and wakeup interrupt working fine. Have Battery Backup for RTC. I'm trying to perform a Smooth Calibration which does work but I find that not all of the CALM[0:8] bits in RTC_CALR seem to work. I did some experiments and found that CALM[0:4] bits don't affect the calibration, CALM[5:8] bits do. The finest step change seems to be approx. 31 micro Hz.

Another thought, does the calibration get lost upon losing battery power?

 

Great Processor but what a learning curve!

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