Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
Install host dependencies.
Import toolchain and SDK.
Create, configure, build and manage apps.
Debug STM32.
You can directly download it from the VSCode marketplace
For more details, visit the Zephyr Workbench
Seen this a few times on various STM32 processors (currently working on STM32L073). I’ve found that its a problem with the NRST line on the STLINK. Don’t know why, the NRST is working and is not being held by anything. Go into the debugger setup and switch to “Software system reset”, then it works.