本程序有友善之臂提供，为2440开发板的示例程序，请把该目录复制到目录中，编译使用时进入其中一个子目录，运行make即可。-This procedure has the arm to provide a friendly, for example the 2440 development board, please copy the directory to the directory, the compiler used to enter a subdirectory, you can run