nRF51822 timer problems

RE: nRF51822 timer problems

Håkon Alseth — Wed, 07 May 2014 13:21:22 GMT

There are specific calls to sd_* prefix functions, which will not work if the SoftDevice is not present in flash. If you want to use the scheduler w/o the softdevice, you'll have to "port" the macros that calls sd_*-functions. As I see it, it's only the CRITICAL_REGION macros, which basically just enable/disable interrupts.

RE: nRF51822 timer problems

bvrm — Tue, 06 May 2014 16:04:49 GMT

The problem is the call of sd_nvic_critical_region_enter(). I don't have a softdevice implemented.

When not using CRITICAL_REGION_ENTER() / _EXIT() my example code works.

How do use app_scheduler without a softdevice correctly?

RE: nRF51822 timer problems

bvrm — Tue, 06 May 2014 14:18:28 GMT

I've located my problem. app_timer is calling app_sched_event_put on a timeout. But when enter CRITICAL_REGION_ENTER() the device does not return from current_int_priority_get().

RE: nRF51822 timer problems

bvrm — Tue, 06 May 2014 13:34:28 GMT

Hi Håkon,

this example helped me a lot to get app_timer working without a softdevice.

Please could you also add the use of the scheduler by the app_timer module to this example?

RE: nRF51822 timer problems

Håkon Alseth — Tue, 06 Aug 2013 12:16:36 GMT

The app_timer does not depend on the softdevice stack, but the power_manage function calls a sd_* sleep function.

RE: nRF51822 timer problems

Viktor — Tue, 06 Aug 2013 11:59:35 GMT

Thanks! For some reason I thought that the app_timer functionality does not depend on SoftDevice :/

RE: nRF51822 timer problems

Håkon Alseth — Mon, 05 Aug 2013 10:51:31 GMT

The reason why your debugger went haywire is because your assert-handler will cause a soft-reset on the power_manage function if s110 is not enabled. I added a check to see if the S110 stack is enabled for you.

RE: nRF51822 timer problems

Håkon Alseth — Mon, 05 Aug 2013 10:50:15 GMT

Hi Viktor,

I had a look at your project. You are not enabling the S110 stack, which means that you will have to start your LFCLK manually. I also took the liberty of changing a couple of other things in your project, like the power_manage function and disabling the scheduler.

Note: You are enabling the scheduler, but not using it.

Best regards Håkon

main.c