Is it possible to reset/restart application without resetting USBD

RE: Is it possible to reset/restart application without resetting USBD

Sigurd — Mon, 21 Mar 2022 16:33:15 GMT

[quote user=""]Is it possible to start the firmware without resetting the USB instance so Windows have a continuous COM "connection" , i.e. the COM port does not disappear and reappear.[/quote]

No. This is not supported.

RE: Is it possible to reset/restart application without resetting USBD

Andreas3T — Fri, 18 Mar 2022 09:26:44 GMT

I'm getting the same COM number as intended, the issue is the temporary disappearance of the COM port.

RE: Is it possible to reset/restart application without resetting USBD

bpaddock — Thu, 17 Mar 2022 13:51:57 GMT

It is the pull-ups on the D+ or D- lines (Depends on device speed) that determine if Windows re-enumerates.
During device reset these typically are turned off, so Windows terminates the connection.

If you are getting a different COM number on each cycle, you can assign a serial number, even if it is just "1", in your USB descriptor for the port. It will stop being a different COM port number on that USB hardware instance.