Kinetis Microcontrollers中的主题 Re: About nested hardware timer interrupt on K21

About nested hardware timer interrupt on K21

rahulhirve — Fri, 15 Apr 2016 11:24:24 GMT

Hi All,

I am trying to use hardware timer interrupt in nested way for my project, So when I am going in VLPS mode I am initializing and starting timer 1 interrupt for waking up out of VLPS.

And in timer 1 ISR I am enabling timer 2 and running a while loop, In timer 2 ISR I am again going in VLPS mode.

What I am observing is I am successfully waking up hitting timer 1 ISR and initializing timer 2 interrupt, running in while loop of timer 1 ISR. But I am not hitting to timer 2 ISR after timeout of timer 2 rather the core remains in while loop of timer 1 ISR.

Please find attached snap shot of code I am using, any suggestions?

Thanks,

Rahul

Original Attachment has been moved to: timer_intr.c.zip

Re: About nested hardware timer interrupt on K21

danielchen — Wed, 20 Apr 2016 22:24:51 GMT

Hi Rahul

which MQX version you are using, MQX 4.2 or MQX for KSDK?

Regards

Daniel

Re: About nested hardware timer interrupt on K21

rahulhirve — Thu, 21 Apr 2016 03:24:35 GMT

Hi Daniel,

I am using MQX 4.1.

Thanks,

Rahul

Re: About nested hardware timer interrupt on K21

danielchen — Mon, 09 May 2016 07:57:34 GMT

Hi Rahul:

I think the ISR should be as short as possible, and be executed as quickly as possible. You should try to avoid calling long and time consuming subroutines in ISRs. There is a while loop in your isr, I guess maybe problem is there.

Regards

Daniel