微机USB接口的应用开发

通用串行总线USB具备速度快但又提供低速方式、支持热拔插、易于扩展、总线供电、使用灵活等优点，通过分析USB通用串行总线系统各通信模型层次关系和信息传输的基本工作原理，了解USB接口的内部结构和检测通信的要领及设备驱动方式，研究在Windows环境下通过Visual Basic语言，调用API函数实现工业控制及其他应用USB接口的方法，对新补充的OTG技术也作简单介绍，最后用一个实例介绍USB接口如何进行设备检测和通信。

Application and Development of Interface with Universal Serial Bus in Microcomputer

Universal serial bus has the advatages of high speed,also supplying low speed way,supporting hot plug in or pull out,easily extended,bus power supply and applied flexibility.The article analyses the layers relation of communication model and the basic working principle of information transmission in USB system,to understand inner structure of the interface and the essentials of testing communication,and device-driven way,to research in Windows environment,via Visual Basic language invoking API function to realize industrial control and other application ways.It introduces simply a new complementary On-The-Go technique,too.Finally,a practical example explains the interface how to realize device testing and communication.