libusb_endpoint_descriptor::bmAttributes field

Attributes which apply to the endpoint when it is configured using the bConfigurationValue. Bits 0:1 determine the transfer type and correspond to libusb_endpoint_transfer_type . Bits 2:3 are only used for isochronous endpoints and correspond to libusb_iso_sync_type . Bits 4:5 are also only used for isochronous endpoints and correspond to libusb_iso_usage_type . Bits 6:7 are reserved.