How can I use my own scheduler with app_timer?

RE: How can I use my own scheduler with app_timer?

julian24 — Wed, 26 Mar 2025 19:21:00 GMT

It was completely my fault, misusing the scheduler.
Now i've been able to use my previous scheduler as a wrapper for app_scheduler

thanks for everything, Vidar

RE: How can I use my own scheduler with app_timer?

Vidar Berg — Thu, 13 Mar 2025 05:33:44 GMT

Hello Julián,

Are you calling app_sched_execute() from the main loop and APP_SCHED_INIT() on init like in the ble_app_hids_ examples? The scheduler queue cannot be cleared.

Best regards,

Vidar

RE: How can I use my own scheduler with app_timer?

julian24 — Wed, 12 Mar 2025 18:02:56 GMT

Hello Vidar,

Yes, I agree, it's a bit excessive. I'm now using app_scheduler, and my own, previous, scheduler now functions as a wrapper for app_scheduler so I don't have to change all my code.

However, I have a problem when using timers with the scheduler. Even though the timer interruptions function properly and I can get them to work normally, I keep getting events put into the schedule by the RTC (see image).

At some point in my code, I need to check if there are tasks scheduled pending to be executed in order to decide if the code shall go on or keep cycling. Since RTC keeps putting events into the schedule, I can never get to see an empty task queue.

I need to understand why this happens, and if there's any way to prevent it while still using app_timer with app_scheduler. I've read both libs documentation but there's no specification on this.

Maybe it's my error on the configuration.

By the way, is there some way to clear the schedule?

Thanks,

Julián

RE: How can I use my own scheduler with app_timer?

Vidar Berg — Fri, 07 Mar 2025 14:40:58 GMT

Hello Julián,

Using app_scheduler() in addition to your own scheduler sounds a bit excessive. Can you enqueue your scheduler tasks from the app timer timeout handlers instead (interrupt context)?

Best regards,

Vidar

RE: How can I use my own scheduler with app_timer?

julian24 — Thu, 06 Mar 2025 12:58:33 GMT

Hello,

If i use it with app_scheduler, can i register my scheduler as a handler? or do i have to schedule my own scheduler as a task each time?

Thanks,

Julián

RE: How can I use my own scheduler with app_timer?

Vidar Berg — Thu, 06 Mar 2025 12:49:01 GMT

Hello,

The app timer library was rewritten as app_timer2. Unfortunately it no longer supports user provided scheduler functions. However, it can optionally be used with app_scheduler by enabling the APP_TIMER_CONFIG_USE_SCHEDULER setting in sdk_config.h. Is it an alternative to just add your tasks to your scheduler from the app timer interrupts instead?

Best regards,

Vidar

RE: How can I use my own scheduler with app_timer?

julian24 — Wed, 05 Mar 2025 19:16:48 GMT

PS:

More specifically, I'm trying to migrate my code to SDK v17.1, and am currently in this situation pointed out in the Migration Note. I'd like to specify my scheduler function as I did before, in SDKs previous to SDK v13.0.