USB设备类型deviceclass代码完整版_USBclasscode

USB

设备类型代码

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USB Class Codes
December 7, 2011
USB defines class code information that is used to identify a device’s 
functionality and to nominally load a device driver based on that 
functionality.The information is contained in three bytes with the names Base 
Class,SubClass, and Protocol.(Note that ‘Base Class’ is used in this 
description to identify the first byte of the Class Code triple.That terminology 
is not used in the USB Specification).There are two places on a device where
class code information can be placed.One place is in the Device Descriptor, 
and the other is in Interface Descriptors.Some defined class codes are 
allowed to be used only in a Device Descriptor, others can be used in both 
Device and Interface Descriptors, and some can only be used in Interface 
Descriptors.The table below shows the currently defined set ofBase Class 
values, what the generic usage is, and where that Base Class can be used 
(either Device or Interface Descriptors or both).

Base
Class
Descriptor
Usage
Description
00h Device Use class information in the Interface Descriptors
01h Interface Audio     
02h Both Communications and CDC Control
03h Interface HID (Human Interface Device)
05h Interface Physical
06h Interface Image
07h Interface Printer
08h Interface Mass Storage
09h Device Hub
0Ah Interface CDC-Data
0Bh Interface Smart Card
0Dh Interface Content Security
0Eh Interface Video
0Fh Interface Personal Healthcare
10h Interface Audio/Video Devices