Calendar in the nRF5340

[WesC]

If I can get time through WiFi then send it to the nRF5340 and place it in a Struct TM. is there any method to have the nRF5340 maintain the time/calendar from that initial setting and only use WiFi to periodically keep the time sync. is there a time system using the RTC of the nRF5340 to keep time?

[Jørgen Holmefjord]

Hi,

The simplest solution would be to store the time received over WiFi along with the uptime of the system at that time, and use the delta between that uptime and the current uptime to get the current time. This seems to be implemented in the POSIX clock_settime()/clock_gettime() functions.

You can find an example of using this functionality in this example:

• https://github.com/too1/ncs-nrf5-cam-tl-controller/blob/master/src/main.c#L293-L303
• https://github.com/too1/ncs-nrf5-cam-tl-controller/blob/master/src/main.c#L396-L397

Best regards,
Jørgen

[WesC]

thanks for the help.  He also needed to add CONFIG_POSIX_CLOCK=y to the prj.conf  and time.h and posix_time.h were working