功能描述：简单的LED杂项设备驱动，在做好AMR9开发板根文件系统后，加载该驱动程序和控制的应用程序能实现LED灯的亮灭控制-Function Descr iption: LED miscellaneous equipment simple driver, do a good job in the development board AMR9 root file system, light control application program loading the driver and co