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# 2.5.4.18 USB_DEVICE_CDC_TRANSFER_HANDLE_INVALID Macro

## C

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

## Summary

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.

## Remarks

None.