Problems uploading a second time with StLink

Then maybe the default reset method used in the stm32g0x.cfg is “software reset”, i.e., trying to do a reset by sending a command via SWDIO+SWCLK. Since you use one of those as I/O, that fails. When it instead does a hardware reset via NRST before that, or during that, it’s able to use SWD again.

There are a lot more reset methods available.

A quick thing to try would be to use the config aimed at a Nucleo G0 (st_nucleo_g0.cfg): The config is generic for all G0x boards and uses the reset_config srst_only method, which may be the one you need.

Just replace

with

      "openocd_board": "st_nucleo_g0",

(see platform code).

Otherwise, use your original config, find the stm32g0x.cfg file in C:\Users\<user>\.platformoi\packages\tool-openocd\ and play around with all possibly reset configs and see which ones work.

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