RTC in CC2538

According to function descriptions of osal_getClock, osal_getClock returns number of seconds since 0 hrs, 0 minutes, 0 seconds on the 1st of January 2000 UTC. I suppose you can add difference of seconds between the 1st of January 2000 and 1 January 1970 to get it.

I see. Do you need the 32kHz OSC to use the OSAL_Clock.h functions? or the 32MHZ will be enough? The current design of our board doesn't include the 32kHz OSC.

I think you don't have to use external 32K OSC to use osal_clock.h functions but it would be more inaccurate in comparing to use one.

I did fresh start the zigbee node and read osal_getClock(). It gives me 0, 1, 2 which means that it always starts at zero. It's not the number of seconds that elapsed from 0 hrs, 0 mins, 0 sec on the 1st of january 2000 UTC. Is this normal? I want to get the timestamp value and pass it via air which will be read by coordinator and save to mysql database with the timestamp it generated from the node.

You have to call osal_setClock to set clock in your application init function.

I'm a bit confused where to get the initial value as an argument to osal_setClock. My end goal is to determine the current UTC time of zigbee node just like the UTC time in my laptop.

Understood. Thanks!

You are welcome.