usb驱动文件，在主机上安装的对开发机的USB驱动-usb driver files, installed in the host machine on the development of USB drives

STM3210B-LK1开发板玩USB的程序，包含固件、驱动和测试用的应用程序,上下位机通讯，很简单的实现。-The LK1 development board STM3210B-play USB-program, including firmware, drivers and test applications, the upper and lower machine communication, very simple to achieve。