USB设备类型代码以及详细说明

说明:由于链接是相对路径,下载和点击会不正常,如果需要下载文中提到的文档,请去官方网站相关地址下载

以下是USB所有支持的设备类型代码.

地址:http://www.usb.org/developers/defined_class

USB Class Codes                    

November 17, 2009

 


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

DCh

Both

Diagnostic Device

E0h

Interface

Wireless Controller

EFh

Both

Miscellaneous

FEh

Interface

Application Specific

FFh

Both

Vendor Specific

你可能感兴趣的:(class,interface,descriptor,video,security,audio)