ARMLINUX 环境下开发的文件访问程序，能对文件进行读取和写操作。-Development environment ARMLINUX file access procedures, the documents can be read and write operation.

本程序是linux下的字符设备驱动，实现对led的控制，可以学会自动分配主设备号，字符设备的增加和注册，file_operation的实现-This procedure is a character device driver under linux led control, you can learn to automatically assign major number, the characters increased equipment and registration, file_o