USB Device CDC Function Driver Invalid Transfer Handle Definition 

This definition defines a USB Device CDC Function Driver Invalid Transfer Handle. A Invalid Transfer Handle is returned by the USB_DEVICE_CDC_Write, USB_DEVICE_CDC_Read and the USB_DEVICE_CDC_SerialStateNotificationSend functions when the request was not successful.

#define USB_DEVICE_CDC_TRANSFER_HANDLE_INVALID ((USB_DEVICE_CDC_TRANSFER_HANDLE)(-1))

None.