本文介绍了在基于ARM7的嵌入式系统上开发 USB接口的详细内容。 项目使用 ARM7（MCU处理器）和PDIUSBD12（USB芯片）完成了U 盘的开发。主要内容涉及 USB 接口的 U 盘开发过程中所涉及的技术内容；重点介绍项目调试方法与步骤；并附上了自己在开发此项目过程中的一些心得与体会-This article describes the ARM7-based embedded systems development details of the USB interface. Project using the ARM7 (MCU processor) and PDIUSBD12 (USB chip) completed the development of U disk. Mainly concerning the U disk USB interface development process involved in the technical content　focuses on measures and steps to debug the project　attach their process in developing this project and experience of some experience