Strange behavior - HW probelms?

TheRaprus · ‎2024-04-03

Hello to everyone.

I'm working on a display interface, changing from M3 -> M4 -> H5 CPUs. The issue appeared on all type(it's a HW issue?)

At the beginning I can connect, debug, program and so on. Bt after some operation, I can't continue. I still have a "No STM target found" error, from CubeIDE and Programmer.

What I can see is that the CPU voltage is not 3.3V, but less:

This happen with different STLINK-V2 or V3. Obviously I check the volts on SWD pin 1 and it's always ~3.3V

When this happen I usually pas to another board/JTAG. But afer a while I connect the old JTAG-Board and it work again. I enclose the schematics, because I presume it's a HW problem.

Can someone gimme a tip?

Thanks.

TheRaprus · ‎2024-04-03

You're right!

But after posting my colleague realize that a cable isn't well inserted. It's a mistake, after 2-3 month of tests.
And I'm sure I can't realize it until I made this post :frowning_face:

View solution in original post

STTwo-32 · ‎2024-04-03

Hello @TheRaprus

When You find a solution to your own request, is a good idea to share it instead of deleting your post. It may help others.

Best Regards.

STTwo-32

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Andrew Neil · ‎2024-04-03

@TheRaprus wrote:

At the beginning I can connect, debug, program and so on. Bt after some operation, I can't continue. I still have a "No STM target found" error, from CubeIDE and Programmer.

Are you disabling (or re-configuring) some or all of the debug pins at some point in your code?

TheRaprus · ‎2024-04-03

You're right!

But after posting my colleague realize that a cable isn't well inserted. It's a mistake, after 2-3 month of tests.
And I'm sure I can't realize it until I made this post :frowning_face:

Andrew Neil · ‎2024-04-03

So you were right - it was a hardware problem!