Tell if timer is running

[Nikolaus Wittenstein]

Is there a way to tell if the timer is running? There's a start task, and a stop task, but I'm not sure how to tell if a timer is currently running. The best thing I can think of is to capture the value, wait a little while, capture the value again, and see if it's changed. This seems both unreliable and time-consuming. Is there a better way?

Thanks!

[Nikolaus Wittenstein]

Similarly, is there a way to tell if a PPI group is enabled? I only see a way to enable and disable it.

[MartinBL]

I can't think of any other way than what you describe. Shouldn't your application know this anyway? After all your application should control when the timer is started and stopped.

Regarding PPI you can read out the CHEN register.

[Nikolaus Wittenstein]

The reason my application won't know is that I'm using LPCOMP and PPI to stop the timer when a (transient) voltage goes high. Is there a way to know that this triggering has happened?

[MartinBL]

I would assume you could use the upward crossing event, NRF_LPCOMP->EVENTS_UP, and hook it straight to your timer's stop task, NRF_TIMERx->TASKS_STOP? You could also use the LPCOMP interrupts if you want to stop your timer in software.

[Nikolaus Wittenstein]

Yeah, I can turn the timer off with the LPCOMP. What I was curious about is if there's a way to tell if this has happened. I can't use an interrupt because the idea is this is guarding the PWM during Bluetooth transactions.

Right now my workaround is to also enable a channel group with the LPCOMP, and then I can just check whether the channel in question has been enabled. Sort of wonky but it seems to work. All my timers are already in use so I can't increment a counter.