time keeping during sleep

[rk]

Hello experts,

I am getting into the word of Nordic and hence here is my first question. Kindly help.

Software version: SDK-14 Hardware revision: nRF52832 DK (PCA10040)

I am using BLE_CENTRAL mode on nRF52832 and it works great out of the box :) For certain reasons, I need to keep track of certain jobs in my project and hence I need a functionality similar to RTC. When browsed through the forum, I found that for RTC timekeeping, having a separate HW module was recommended. Instead of this, I went ahead with my design using "application_timer" and my solution just works great.

My device is battery operated and and now I want to save some battery life. Below is the sequence of operations I would like to do in my software.

1. Run software and do desired actions.
2. Note down the sleep entry "timestamp" & then enterr sleep mode to save power.
3. Wake up on button push interrupt.
4. Now record the button push time stamp.

Above said sequence will help me to determine the total sleep duration.

Any suggestions?

Thanks

[Sigurd]

If you are talking about System OFF sleep mode, then the RTC and TIMER are turned off when you enter System OFF mode, and the nRF5x wont be able to keep track of time in this mode. See endnode's answer in this thread.

What power requirements are you looking for in the sleep mode?