Hello everyone,
I'm using STM32CubeIDE 2.1.0 and STM32CubeProgrammer on Ubuntu 24.04.4 LTS.
Yesterday I was able to flash my firmware to an module based on the STM32H755 MCU via ST-LINK using the following settings:
Port: SWD
Mode: Normal
Reset mode: Software reset
Everything worked fine. Today I made some modifications to the firmware, but when I tried to connect again, I got this error:
Error: No STM32 target found! If your product embeds Debug Authentication, please perform a discovery using Debug AuthenticationThings I have already tried (none worked):
Changing Mode to "Under Reset"
Changing Reset Mode to "Hardware reset" and "Core reset"
Holding the reset button while clicking connect
Testing with a different ST-LINK programmer
Testing with a different board (same MCU)
Here is what st-info --probe returns:
Failed to enter SWD mode Found 1 stlink programmers version: V3J15 serial: 004100223235511237333439 flash: 0 (pagesize: 0) sram: 0 chipid: 0x000 dev-type: unknown
The ST-LINK is detected (I see stlinkv3_0 and stlinkv3_5 in /dev), but it fails to enter SWD mode. The chip ID reads as 0x000, which suggests no communication with the target.
The board is powered externally (not by the ST-LINK). The flat cable is connected properly. I verified that the same setup worked yesterday.
Any suggestions on how to recover SWD communication?
I also attached two pictures showing the front and back of the module I'm using.
Thank you in advance.
