串行口是计算机一种常用的接口，具有连接线少，通讯简单，得到广泛的使用。常用的串口是RS-232-C接口. 由于Linux引入了设备文件的概念,读写串口可以像读写普通文件一样进行操作，非常简单，方便。-The serial port is a common computer interface, with connecting lines is less simple communication, is widely used. Used serial RS-232-C interface.

The following file contains three types of digital communications sampling. Contains ideal sampling, natural sampling and ZOH sampling, operate only for one single frequency signal, can be modified to add multiple signals with a base frequency. Greet