Profiling FreeRTOS and softdevice

[TS Gowtham]

Hi,

I'm using the nRF52832 with FreeRTOS and SDK 14.2.0 . I took a look at Profiling the Softdevice and FreeRTOS with Segger SystemView and Instrumenting with Segger SystemView . But both these blog posts have the lib file only for s132 v2.0.0 . So, has the required hooks been included in the latest version of the softdevice? Or is there any method from which I can get systemView or any instrumentation software working? Does Nordic have any suggested methods for this?

Thanks

[Susheel Nuguru]

Hi Gowtham,

The files that are provided in that article by RK was done by reverse engineering the hex file.We have not allowed any hooks in any softdevice to be able to profiles as this consumes memory and introduces latencies.

I am guessing that you want to do this only for educational purpose and have is not a blocker for your implementation.

[TS Gowtham]

Hi Sushel,

I'm actually porting a production code to FreeRTOS and I'm having multiple issues with incorrect priorities for the tasks and timers. So, I thought that profiling would help me with this. Is there any other debug method or something to optimize the priorities?

[TS Gowtham]

Hi Susheel,

As you have mentioned, I have not modified any of the interrupt priorities in sdk_config.h. My application does not use any of the interrupts, it only uses FreeRTOS tasks.

I'll take up your advice and concentrate on the task priorites. Any suggested method for profiling just the FreeRTOS tasks?

I've tried the RTOS thread awareness in SES but that keeps throwing up errors. And I've tried SystemView but couldn't apply the patch mentioned in this link as I'm using the RTC and not the systick ( my app is based on the freertos hrs example).

Thanks,

Gowtham

[Susheel Nuguru]

I have tried profiling the HRS_FreeRTOS example months ago and it went ok. I have not realized that the later versions of SES/SystemView have glitches. I do not think our FreeRTOS port works with Systick. It needs to be RTC like what you have set

[TS Gowtham]

Hi,

What tools did you use for profiling? Can you provide any links or guides please?

[Susheel Nuguru]

I used SystemViewer and unfortunately I did not make any notes of what changes I was making to make it work. But it did work wonderfully to profile the HRS freertos example we have in the application. The profiling was done just as a hobby to feed my curious mind. Sorry, I guess this information is not of much use to you.

[TS Gowtham]

Thanks, I'll try running SystemView once on the HRS FreeRTOS example before trying it on my code.