Sometime, the timer handler is not called with FreeRTOS.

RE: Sometime, the timer handler is not called with FreeRTOS.

masataka hasegawa — Mon, 03 Sep 2018 01:10:16 GMT

HI,

Thank you the advice.

I think that there is active flag for the exclusive control of the timer start,
And, I have modified to add "pinfo->active = false" if RTOS API failed,
But, I will consider about the minimum ticks of 5 ticks along your advice.

Thank you.

RE: Sometime, the timer handler is not called with FreeRTOS.

Jørgen Holmefjord — Fri, 31 Aug 2018 11:21:01 GMT

I have checked this with our FreeRTOS expert, and your findings makes sense. Unfortunately, this is a limitation with the library that is not well described in the documentation. In the app_timer library used for non-FreeRTOS application, there is a minimum ticks config of 5 ticks (APP_TIMER_MIN_TIMEOUT_TICKS). This limitation is also present in the FreeRTOS version of app_timer, but there is no check to make sure ticks are not set to a lower value than this in the implementation. I have added a bug report internally to get this added to future versions.

Your workaround will most likely work in most cases, but it is not fail-safe. I would strongly recommend that you do not set the ticks value to anything lower than 5. If the function app_timer_start fails, then setting the flag active = true before the function returns is not good.

RE: Sometime, the timer handler is not called with FreeRTOS.

Jørgen Holmefjord — Fri, 24 Aug 2018 08:38:16 GMT

Ok, thanks for the clarification. I will check with our FreeRTOS expert as soon as possible if your approach is correct, and if this should be considered a bug in the FreeRTOS app_timer implementation.

RE: Sometime, the timer handler is not called with FreeRTOS.

masataka hasegawa — Fri, 24 Aug 2018 06:50:43 GMT

Hi.

Sorry, This problem occurred our projects code.

But, I think that it will occur in theory.

and, After fixing it, the problem no longer occurred.

Thanks,

RE: Sometime, the timer handler is not called with FreeRTOS.

Jørgen Holmefjord — Thu, 23 Aug 2018 19:29:06 GMT

Hi,

Do you have any code/project or procedure that can be used to reproduce this behavior?

You say "Sometime, the timer handler is not call immediately after calling app_timer_start()", do you have any examples of when it is called and when it is not called?

Best regards,
Jørgen