Tell if timer is running

RE: Tell if timer is running

Nikolaus Wittenstein — Wed, 09 Mar 2016 14:54:41 GMT

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.

RE: Tell if timer is running

MartinBL — Wed, 09 Mar 2016 08:10:36 GMT

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.

RE: Tell if timer is running

Nikolaus Wittenstein — Tue, 08 Mar 2016 15:40:57 GMT

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?

RE: Tell if timer is running

MartinBL — Tue, 08 Mar 2016 11:42:38 GMT

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.

RE: Tell if timer is running

Nikolaus Wittenstein — Mon, 07 Mar 2016 21:36:30 GMT

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