前面已经上载了三个源码，这个是实时时钟的。如果要实验请批量下载，总共有5个，有的是在2410上测试的，有的是2440-As already uploaded 3 source code, this is a real-time clock. If you want to experiment please bulk download, a total of 5, some of them in 2410 on the test, some 2440