Debug with STLink, have two connected, how do you tell debugger which one to use?

[manuelbl]

It’s not straightforward but can be done. See these posts:

Choosing STLink V2 programmer

Not possible out of the box. You’ll have to modify the OpenOCD script to e.g. check for the existence of an environment variable like “SERIAL”, and then the script can use that serial to identify the correct STLinkv2. That’s how I’ve implemented a “flash firmware to a specific STLink” some time ago. The code for the modified stlink.cfg can be found at Programming with multiple ST-Link programmers (the new scripts all redirect to stlink.cfg). # # STMicroelectronics ST-LINK/V2-1 in-circuit debu…

More than one ST-Link for upload (several devices are connected to PC_

openocd is inherently unable to distinguish STLinks by default, but a modification can be done to check the serial. See Programming with multiple ST-Link programmers. This is different for every single upload tool, some might not even support it.