LIBUSB_ERROR_BUSY

This error most often occurs when you try to connect to a ChipWhisperer device that is already connected elsewhere (e.g. in another notebook).

You must disconnect from the first session, either with scope.dis() or by restarting the notebook’s kernel, before you can connect to ChipWhisperer in another notebook.

It’s also possible for this error to occur if Husky has gotten into an unexpected state that it can’t recover from (failed stream captures can sometimes do this). In this case, a hard reset resolves the problem.

This applies to all ChipWhisperer hardware and software.