nRF52 - Softdevice, app_timer and RTC at same time?

[PaulP]

My application is based of the UART example, I have a repeating app timer that fires every 5 min's to do some tasks, I also utilise single fire timers (initiated for events that come from the 5 Min timer.

I also require access to some sort of system time - these times are only required occasionally - right now I provide these via a repeating app timer at 1 second intervals (updating a 'system_time' variable).

It seemed wasteful to wake the system up every second to update the time, so I thought I could use the RTC to run in the background and just poll for the counter value when I need the system time. So thats where my problems start!

Trying to enable the RTC, as soon as I enable RTC0 in the sdk_config.h it causes my code to race with interupts (at least I think thats whats happening), I have tried two methods of initilising the RTC - The way shown in the RTC example (but setting all interupts/overflows to false) and without initilising it at all (NRF_RTC0->TASKS_START = 1;) I realise I might just be being stupid (this is my first nRF project) Is it possible to run the RTC, app timer and softdevive at the same time? Would I be better to switch to using the RTC and not the app timer at all?

Thanks guys... this should be my last question......

this year ;)

[MartinBL]

Hi,

RTC0 is blocked by the Softdevice.

RTC1 is used by the app_timer library

Hence you should try using RTC2 for your application specific things. If you use RTC0 or 1 you will interfere with either the Softdevice or the timer library.

[PaulP]

Ahhh.. stupidity... Typically I had tried both RTC0 & 1.

I'll try using RTC2 and update this with the results.

Once again, thanks (I know a lot of my questions are very basic!)

[MartinBL]

Happy to help. Good luck!

[PaulP]

So I got around to trying RTC2, but I got the same results, program just crashes as soon as it starts, I have a workaround in place at the moment (just using app timer to increment a counter value) I'll come back to this starting from a basic example and see where I go from there.

Thanks for all your help.

[ewizardii]

Did you ever find a solution to this ? I am trying RTC2 and having similar issues.