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# 2.3.4.10 USB_DEVICE_AUDIO_TRANSFER_HANDLE_INVALID Macro

## C

    #define USB_DEVICE_AUDIO_TRANSFER_HANDLE_INVALID

## Summary

USB Device Audio Function Driver Invalid Transfer Handle Definition

This definition defines a Invalid USB Device Audio Function Driver Transfer Handle. A Invalid Transfer Handle is returned by the USB_DEVICE_Audio_Write , USB_DEVICE_Audio_Read, functions when the request was not successful.