RTC in with calendar

[spa23]

Hi

I am working on an STM32wl project where I need to use a real time clock, I use the Utilities that I have found in one of the examples that ST provides, it is the Sequencer, Timer server and System time.

I can not see if there is a smart way to save and read the current time.

I can see that the Timer server uses the RTC in free running mode and therefore can not set the current time.

If I set System time, and reset the stm after some time, it starts with the time I have set earlier, and not the updated time.

anyone who can point me in the right direction ??

[Bruno_ST]

Hello @spa23​ ,

Here is a way to do it with attached patch to apply on top of the LoRaWAN_AT_Slave example.

This set the time :

AT+LTIME=00h27m09s on 05/05/2022

This retrieve the time :

AT+LTIME=?

Then after reset or power loss (but with VBAT is kept), you should keep your time as you have set it.

If RTC is enabled then we don't re-initialize it !You may increase robustness with more checks if you want....

Hope it helps you.

BR,

Bruno