Posted on May 17, 2011 at 13:38I found the solution. Writing to the backup and RTC registers must be enabled with: PWR_BackupAccessCmd(ENABLE);

Posted on May 17, 2011 at 13:38I intend to calibrate the RTC by adjusting the prescaler in the RTC_PLR register. But any write to this register while enabled RTC, causes the RTOFF bit to hang. This code hangs: RTC_WaitForSynchro(); RTC_WaitForLast...