STM32L476VG RTC overflow

[mejrissi]

Posted on September 14, 2016 at 12:16

Dear Gents,

I am having a little bit of trouble with the RTC on the STM32L476VG. Can anyone tell me please what is the maximum date that the RTC can calculate? Is there an overflow interrupt? I can't find in the stm32l4xx_hal_rtc.c the function RTC_IT_CONFIG(RTC_IT_OW, ENABLE) like the STM32F1 series?

Thanks in advance for your time.

#stm32l4 #rtc

[mejrissi]

Posted on September 14, 2016 at 18:49

I understood the problem. Reading the RTC datasheet further, I found that THE RTC registers contain directly the year, month, week, day, ... There is no counter which may overflow.

[Nor Sch]

Posted on February 13, 2017 at 10:27

Yes, but the Year only supports 2 Numbers and so you do not have the century and therefor the HW can not calculate itself the Day of the Week. Additionally ST still uses the archaic BCD-Format, so you need some additonal Code for converting from normal Time-Values (Unix-Time or Decimal Numbers) to the BCD which is supported by the STM32L4-HW. Things could be better and easier ...