模拟RS-232串口产生周期串口数据，可以根据需要修改周期参数，及时钟参数，代码可以直接用来产生需要波特率的通讯模拟数据。-Analog RS-232 serial port generates cycle serial data, based on the need to modify the cycle parameters, and clock parameters, the code can be directly used to generate analog data communication needs baud rate.