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STM32F303REs RTC Error

Question asked by truong_tan.duong on Mar 7, 2016
Latest reply on Mar 7, 2016 by Clive One
Hi all,

I have designed a device to track data of car. I have used the STM32F303RE and FreeRTOS to program its operation. 

When I use SD card task to read data from SD, it take a long time (about 30 minutes) to get data. After that, I found an error relate to RTC of MCU. I have displayed time and day of RTC on Terminal and got a result: 00:68:68 19/02/2000. And the interrupt of RTC also has not operated (I have used AlarmA interrupt of RTC to generate 1 second interrupt). But when I reset device, RTC operated well, time and day displayed correctly.

I have tried to understand this error but not successful.
Could anyone give me some advice to resolve this problem?
Thank you very much.