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struct usb_device_descriptor {
    __u8  bLength;              // É豸ÃèÊö·û³¤¶È
    __u8  bDescriptorType;      // É豸ÀàÐÍ
 
    __le16 bcdUSB;              // USB°æ±¾ºÅ£¨Ê¹ÓÃBCD±àÂ룩
    __u8  bDeviceClass;         // USBÉ豸ÀàÐÍ
    __u8  bDeviceSubClass;      // USBÉ豸×ÓÀàÐÍ
    __u8  bDeviceProtocol;      // USBÉ豸ЭÒéºÅ
   


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