说明：  F310的完整代码，实现从模拟端口对视频信号采样，并将所采得的图像信息以RS232方式发送到上位机PC中，并在上位机实现图像的还原过程。
(F310 complete code, realize from analog port for video signal sampling, and collected by the image information to RS232 mode is sent to the host computer PC, and PC realize image restore process.)