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HPam.1
HPam.1
Associate II
July 8, 2020
Question

How to debug interrupt ISR and FreeRTOS tasks in STM32CubeIDE?

  • July 8, 2020
  • 1 reply
  • 2463 views

I have tried to follow a youtube video https://www.youtube.com/watch?v=TH2aCiU9Jyo (Analyzing FreeRTOS Application using SEGGER SystemView Trace software : Part 1 from Fastbit Embedded Brain Academy ) to try and debug the ISR from SEGGER SystemView Trace software.

The process require one to flash STLink firmware with a JLink Compatible Firmware, afterwards use Segger SystemVIew to record and view the the hardware interrupts/ FreeRtos Task in realtime. And one should also include the RTT library into their project and add relevant code into their source file.

I want to know if this is the correct approach for debugging ISR and Tasks ? I couldn't find any guides on how to achieve this in STM32CubeIDE, most guides are for Keil,Eclipse or Atollic only! And I do not want to switch to another IDE as my code currently works well with ToughGFX Designer, STM32CubeIDE.

Can anyone provide the standard approach for debugging ISR and Tasks in STM32CubeIDE with/without Segger SystemView to allow amateur programmers such as myself the opportunity to debug their program?

Thank you very much for your time!

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1 reply

Piranha
Piranha
Principal III
July 11, 2020

Standard approach is to use breakpoints, watch variables and some printf() style logging. The methods you describe are good but more like an advanced level and for performance profiling.

No debugging will help if you don't know the fundamental concepts of interrupt and thread safe programming. But, when you do know it, then the standard breakpoints and watch variables are good enough even for pretty complex projects.

HPam.1
HPam.1Author
Associate II
July 12, 2020

Hi , thank you very much for your reply. I have been using this method to debug my program. My program is quite big, i tried my best to put a short printf function such as printf("_A1") or print("_B20") in every functions inside main.c. I will then use SWV ITM Data Console and check the printf output of the program after running for a few seconds. An data console would look like the following 0693W000001shUBQAY.png

I then copy paste the console output, and put into Visual Studio to find irregular pattern and try to deduce the cause0693W000001shULQAY.png

For example, the correct sequence should be Z1__ADZ2Z24Z29Z30Z32, but the sequence became Z1_Z24Z29Z30Z32, a function with printf("_AD") is not fired at all.

Another example is Z1__ADZ2Z24Z29Z30DZ2Z24Z29Z30Z32, a function with printf("Z2") repeats itself twice, which shouldn't be possible , unless something have messed with the program counter, which is definitely not done by me intentionally. The other possible cause is the freeRtos is messing with the stack pointers to make sure that all task's are fired at the right time interval etc. (i'm stuck in this part for few weeks already, can't solve the bug )

Overall, this is really hard for me to debug manually, and would like to see if SEGGER SystemView Trace could help me trace where the issue is at.

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