Zephyr Mesh / Timer accuracy

[masak]

Hi,

I am evaluating Zephyr mesh and implemented two timers; one triggers at every 2 mS, the other triggers at every 500 uS.

I put a code in both timers' events to toggle a gpio so that I can measure accuracy of timing. It shows nearly 100 uS jitter.

For 500uS timer, it is 20% error. I need more accuracy, at least +-5 % of the target frequency of the timer function. Is it possible? 

Thanks,

masakura

[Joakim Jakobsen]

You can check the documentation for the resolution of the timers.

Are you using the RTC or the TIMER?

[masak]

Hi,

Which document? BTW, I feel it is nothing to do with the resolution. Anyway, what I am trying to is to reduce the jitter of the timer interrupt when it is set to trigger at 500uS using this API.

k_timer_start(&my_timer_ms, K_MSEC(TIMER_INTERVAL_MSEC), K_MSEC(TIMER_INTERVAL_MSEC));

I don't know whether it is replies on RTC or Timer, but I guess it it the timer.

With the current setup, The period between two interrupts ranges about 400 uS to 600uS, not stable at 500uS.

I am looking for solution for this.

Thanks,