libusb_transfer_status

type libusb_transfer_status = (

  LIBUSB_TRANSFER_COMPLETED,

  LIBUSB_TRANSFER_ERROR,

  LIBUSB_TRANSFER_TIMED_OUT,

  LIBUSB_TRANSFER_CANCELLED,

  LIBUSB_TRANSFER_STALL,

  LIBUSB_TRANSFER_NO_DEVICE,

  LIBUSB_TRANSFER_OVERFLOW

);