DM642基于3号输入端口的实时视频输入输出实验的工程，个人觉得可以与基于二号端口的实验进行比较学习，适合初学CCS3.3的人-DM642 based on the 3rd input real-time video input and output ports experiment works, personally feel that learning can be compared with the number two port-based experiments, suitable f