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USB_VBUS is not an alternate function, it is an additionnal function which is always enabled. If configured as an alternate function, it will draw current from VBUS.
README
This example implements a USB CDC-ACM device (aka Virtual Serial Port) to demonstrate the use of the USB device stack.
Board connections
| Port | Function | Description |
|---|---|---|
CN5 |
(USB_OTG_FS) |
USB acting as device, connect to computer |