DA0832 波形输出，支持正弦，余弦，线形，三角波-DA0832 waveform output, support for sine, cosine, linear, triangle wave

通过labwindows编程编写的串口发送波形函数，串口不仅仅是一个串口，也可以是一个信号源-By programming with LabWindows prepared by the serial port to send the wave function is not only a serial port, serial port, and can also be a signal source