Nucleo-H7S3L8 no longer connects

[GlennK]

I have a Nucleo-H7S3L8 board that I have been using for development, but it is no longer able to connect to download binaries. I had previously been able to connect, but now when I try to run code using STM32CubeIDE, the ST-LINK GDB server fails with the message:

Target no device found

Error in initializing ST-LINK device.
Reason: No device found on target.

I also tried connecting with the STM32CubeProgrammer and I get a window that pops up with "Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug Authentication".

In the Debug configuration, the type is "Connect under reset". I've tried different cables and different computers. I don't have another Nucleo board, but I've confirmed that I can connect and load code into a board with an STM32F411. What else can I try?

[LysAn]

You can try to type in the terminal (for OS X. With Windows it might be slightly different) :

ls /dev/*usb* 

That should list all the USB connections.

Also, you can type in the terminal (again, for OS X. With Windows it might be slightly different):
system_profiler SPUSBDataType

That should display the voltage and current of the respective USB ports.

If the μCU appears there, then perhaps you can try to connect via Minicom (OS X) or Putty (Windows). Please note, that connecting with one these two tools might temporarily sort of "reserve" the port from other applications. So after using these ports, I usually disconnect and restart the computer, if flashing doesn't work right away.
Another idea is to update the ST-Link software with the ST-Link update tool, which is suboptimal and unintuitive however...The ST-Link is a constant problem for me as well. Some times I can connect, others not and I start suspecting some sort of hardware degradation issue.

[KDJEM.1]

Hello @GlennK and welcome to the Community;

Could you please

• Try to upgrade Firmware using STM32CubeProgrammer and erase external memory.
• Refer and follow the steps shared in this FAQ: How can I recover my STM32H7 board after facing a power configuration deadlock?

I hope this help you!

Please let me know if the issue is solved or not?

Thank you.

Kaouthar