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libusb.h:1232
enum libusb_transfer_type
{
LIBUSB_TRANSFER_TYPE_CONTROL = 0U,
LIBUSB_TRANSFER_TYPE_ISOCHRONOUS = 1U,
LIBUSB_TRANSFER_TYPE_BULK = 2U,
LIBUSB_TRANSFER_TYPE_INTERRUPT = 3U,
LIBUSB_TRANSFER_TYPE_BULK_STREAM = 4U
};