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USB设备
USB设备端固件程序,枚举部分是全部程序的基础和重心,只有主机对设备枚举成功后,主机才能和设备进行正常的通信
USB的枚举过程分为4个状态.
1.接入态
v主机检测到USB设备插上,击活端口,并发送复位命令(保持10ms)
2.默认态
v主机使用默认地址读取设备描述符 (GET_DESCRIPTOR)
v主机分配给设备一个总在线的唯一地址 (SET_ADDRESS)
3.地址态
v主机从新的地址获取设备描述符(GET_DESCRIPTOR)
v主机获取所有设备的配置描述符(GET_DESCRIPTOR)
4.配置态
v主机设置描述符(设备,配置) (SET_CONFIGURATION)
v主机读取配置状态(可选) (GET_CONFIGURATION)
v主机读取接口状态(可选) (GET_INTERFACE)
-USB device-side firmware, enumerate all part of the foundation and focus of the procedure, only the host of equipment after the successful enumeration, the host and equipment in order to engage in normal communication USB enumeration process is divided into four status. 1. Access state v host detected USB devices plug in, hit live ports, and send the reset command (to maintain 10ms) 2. default state v Use the default address of the host to read device descriptor (GET_DESCRIPTOR) v host assigned to the equipment of a total online only Address (SET_ADDRESS) 3. A
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一个VFW的视频捕捉系统,适用于标准usb接口的视频流的显示,在Vc中实现,可以很好的进行移植。...
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USB 源代码 ARM S3C44B0
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USB实例程序源码
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usb development documents, a very valuable reference for a detailed account of t...
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CH375的USB接口芯片的x86平台协议程序的情况下
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VC下USB的驱动代码,及其相关操作检测。
VC下USB的驱动代码,及其相关操作检测。-The USB drives code under the VC Enviroment, and its related operation examination.
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usb海量存储的驱动程序
usb海量存储的驱动程序-usb mass storage driver
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USB Host 开发中支持数码相机的源码。即Picture To Picture协议的完整实现...
USB Host 开发中支持数码相机的源码。即Picture To Picture协议的完整实现-Source code for USB Host development supporting digital camera. Full implement of Picture To Picture Protocol.
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CY7C68013控制AD5933进行测温度。点击BULKLOOP.UV2生成HEX文件用USB下载。...
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- 2022-12-03 22:40:03下载
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