STM32 Debugging not available

[watao]

I am using STM32G031J6M6 and using NRST pin as GPIO.

I have been unable to connect to STM32CubeIDE, CubeProgrammer and ST-Link Utility since then, probably because I executed __WFI() in the program.

CubeProgrammer error code

STM32 target not found! If your product has debug authentication built in, please use debug authentication to run detection.”

I did a lot of research and could not connect to either Software/HardwareReset.

Please share your wisdom on how to connect and debug.

[Uwe Bonnes]

Did you try "Connect under reset"? I assume that G0 only remaps NRST after it has booted...

[watao]

Thanks I already tried that but still no connection...

[Andrew Neil]

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@watao wrote:

Please share your wisdom on how to connect and debug.

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FWIW, my wisdom says that repurposing NRST is highly un-wise!

[watao]

I regret that I should not have tinkered with the NRST during debugging

[Andrew Neil]

An older & wiser engineer once said to me:

"if you don't have enough resources to dedicate 10% to debug/diagnostics,
then you don't have enough resources"

in that context, "resources" includes pins.

 

#DebugResources #Diagnostics

[Uwe Bonnes]

Sorry, Connect under reset will not work with NRST remapped without reboot. Can you unpower the board, pull NRST low, repower and than connect under reset and remove the NRST pull?

[watao]

I tried but still could not connect.
I have a Nucleo ST-Link, so I tried connecting to another STM, which was recognized with no problem...

 

[Andrew Neil]

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@watao wrote:

 I tried connecting to another STM, which was recognized with no problem...

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Was that STM running the same code?

[Uwe Bonnes]

Have a look at https://community.st.com/t5/stm32-mcus-products/need-a-clarification-on-nrst-mode-functionality/td-p/249891 too

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Upon power reset or wakeup from shutdown mode, the NRST pin is configured as Reset input/output and driven low by the system until it is reconfigured to the expected mode when the option bytes are loaded, in the fourth clock cycle after the end of trstempo.

[watao]

It's been a while.
I had given up trying to solve this problem, but I confirmed that NRST was enabled immediately after startup, and after trying to connect with CubeProgrammer, I was able to control it successfully!
Thank you very much.