主动、从动USB接口的实现

The realization of host/slave USB interface

基于Cypress公司的USB主/从控制芯片SL811HS,开发了符合USB1.1协议的主动、从动USB接口模块。该模块工作在主动模式时,可以对U盘进行读、写等操作;工作在从动模式时,可以与PC机通信。本文详细介绍了主动、从动USB接口的开发过程以及两者在硬件设计、软件编程上的区别。

Based on USB host/slave controller chip SL811HS, a multifunction embedded host/slave interface module conforming to USB1.1 is developed. As the host interface, the module can write and read flash memory disk. If the module is on slave mode, it can communicate with computer. The design process of host/slave interface and the differences between USB host and USB slave in hardware and software design are introduced.