topic SWO Int Trace confusion in MCUXpresso IDE

SWO Int Trace confusion

andreiszeghy — Fri, 28 Sep 2018 16:53:47 GMT

Hello,

I'm using MCUXpresso IDE 10.2.1 [Build 795] and using the Interrupt Trace View for the first time. I have read the "MCUXpresso IDE Linkserver SWO Trace Guide" and I am still having trouble deciphering a particular sample. In the following screenshot:

What is the gray on top of interrupt [24]? And what is the thick blue line between both interrupts[24]? Nothing in the SWO Int Stats looks out of sorts, but I want to understand what I'm looking at here in the graph.

Thank you and any feedback is greatly appreciated,

Andrei

Re: SWO Int Trace confusion

Alice_Yang — Sat, 29 Sep 2018 07:40:35 GMT

Hello Andrei Szeghy,

- The thin blue line in the row represents that interrupt execution is suspended, but not completed.

- About the "gray", could you please zoom in it check ?

Alice

Re: SWO Int Trace confusion

andreiszeghy — Mon, 01 Oct 2018 13:11:23 GMT

Hello Alice,

Thanks for the reply and sorry for my delay. That said, I'm not sure I understand... First, as you pointed out, my arrow should have read "what is the thin blue line". Regardless, are you suggesting interrupt [24] was suspended for about 150usec until the interrupt was taken again? Am I mistaken to think execution returned to main() during that time?

Thanks for your patience,

Andrei

Re: SWO Int Trace confusion

Alice_Yang — Mon, 08 Oct 2018 03:59:59 GMT

Hello Andrei,

Is this a demo project ? Which one ? I want to test it on my side to check the meaning.

Alice

Re: SWO Int Trace confusion

andreiszeghy — Tue, 09 Oct 2018 18:25:32 GMT

Hello Alice,

No, unfortunately it is not a demo project. The interrupts are pretty straightforward though. I changed the priority so that Timer0 is of the highest priority (most critical) and the UART is of a lower priority. This appears to have worked, but I was unsure of why the UART interrupt had the blue line. Perhaps I'll move on and try some further testing to see it's just a bug in the rendering of the graph.

Thanks,

Andrei