RTC0 IRQ/event on overflow?

[Gordon]

In my project I need to be able to get time from a continuously running RTC. The softdevice uses RTC0, and app_timer uses RTC1 (and starts and stops it).

(annoyingly I have to support nRF51 and nRF52 so I can't just use RTC2)

I've been using RTC0, but of course it rolls over every 512 seconds.

Presumably I can't set up an IRQ because the softdevice does that, but is there some event or callback that I can use to get notified when the RTC has rolled over? Or do I just have to make sure I always wake up after less than 512 seconds so I can check for overflows?

thanks!

[Susheel Nuguru]

please go through this thread. @clemtaylor has implemented a good way of counting the overflows mostly using LFCLK. Even though the solution is on older SDK, it should not be too many API changes in app_timer in latest SDK

[Gordon]

Thanks - looks like a great solution. It's a shame it requires app_timer changes though - it's hard enough changing SDK versions even without having modified anything!