本课题是基于嵌入式系统的USB开发设计，通过USB实现了Flash文件系统的读写，在设计中用到了FAT16文件系统以及USB1.1传输协议，设计中的最大的难点是PDIUSBD12的固件编程-This issue is the USB-based embedded system design, achieved through the USB Flash file system read and write, in the design and use the FAT16 file system, USB1.1 transfer protocol, design the biggest difficulty is the firmware programming PDIUSBD12