RTC isn't updating time in free running mode

[Rushali]

Hi All,

I am facing problem with RTC in STM32.i have written function in my code where i am updating display function for time every 1 min. But whenever i am trying to  see the updated time in free running mode i am unable to see that. But it works fine in debugging mode or at power on or when i program microcontroller.

Please suggest what can be done to resolve this issue? Thanking you in advance.

[Sarra.S]

Hello @Rushali, 

This seems to be related to the shadow registers update, to be sure, you can enable the bypass shadow (RTC_CR_BYPADHAD) in your main function, to see if the issue is fixed.

Also, please specify the stm32 product you are using! 

Thank you!

 

[Rushali]

Dear @Sarra.S 

I have checked with 

HAL_RTCEx_EnableBypassShadow(&hrtc1); by using this command still not able to see the updated time on screen

[Rushali]

Dear All,

Can anybody help me with above problem????????.............

[Sarra.S]

Hello @Rushali, sorry for the delayed answer 

>>But whenever i am trying to  see the updated time in free running mode i am unable to see that.

Can please elaborate more on your problem so we can help you! 

[Rushali]

I have attached file along with this post for you to get a better idea about the code .

[Rushali]

Dear @Sarra.S 

I have attached file along with this post for you to get a better idea about the code .

[AScha.3]

Hi,

from HAL lib:

> @note You must call HAL_RTC_GetDate() after HAL_RTC_GetTime() to unlock the values

-- but call date first.... :)

+

on which cpu ?  (Maybe problem with cache...?)

[Rushali]

hey hii @AScha.3 

It works fine after calling rtc_get_time first and rtc_get_date later. Thank you.