rtc and app_timer

[wizath]

Hi,

Is it possible to use RTC for timekeeping along with app_timer functionality? For example, I want to use simple RTC counter register and overflow interrupt to provide time tracking, but also need the app_timers. The second timer is used for low power pwm library.

[Susheel Nuguru]

If you are not using softdevice then you can use RTC0 and since app_timer use RTC1, this should be OK.

If you are using softdevice and still want to use app_timers then you cannot use RTC counter register but you can modify that app_timer to notify the app for overflows.

[wizath]

I'm not using softdevice, but want to leave RTC1 for low_power_pwm only and use RTC0 to provide app_timers & RTC-like timekeeping (simple update of unix timestamp on overflow or on demand).

[Susheel Nuguru]

If not using softdevice, you can use rtc0

[SebImst]

Hi, I know, the question is old, but I'm struggling with the same problem, but use the ANT+ softdevice. You say it is possible to use app_timer and look for overflows. That is _exactly_ what I would like to do, but: it seems, app_timer has a hard coded interrupt (not weak, so I cannot override it). It also does not make use of the RTC HAL or driver, but directly programs the registers. How am I supposed to hook into the overflow event?

[Susheel Nuguru]

You can use another instance of RTC for your application which is not being used by other modules., and also please create a new thread for your future questions.