Trace via ETB and SWD

[chriscowdery]

Hi All,

 I have been trying to understand the various trace options with the iMXRT1021, IAR Embedded Workbench, and J-Link connected via SWD (just SWDIO and SWCLK pins).

(As an aside, with the 100pin iMXRT1021, you cannot use SWO or TRACE[] if you want to use Ethernet in your application - this seems like a very poor choice of pin allocation for a communications processor!!)

I believe I can use ETM configured to fill the ETB, and get the information out through the J-Link.

Am I right? Is there any code I need to run in my project to configure the ETM / ETB? Or should it be done by the IAR tools?

Thanks,

Chris.

[FelipeGarcia]

Hi Chris,

You are correct. Unfortunately, the SWO function is not present on the debug header. This will be fixed on newer RT parts, such as RT1064.

In addition, there is a community document regarding SWO on i.MX RT1064 EVK that you may find useful.

https://community.nxp.com/community/mcuxpresso/mcuxpresso-ide/blog/2019/06/10/swo-with-nxp-imx-rt106... 

Best regards,

Felipe

[chriscowdery]

Great - thankyou.

I am using IAR EWARM, so I believe that has SWO turned on by default, if your debug probe supports it...

Chris.