说明：  以单片机为基础，设计并开发能输出多种波形（正弦波、三角波、锯齿波、方波、梯形波等）且频率、幅度可变的函数发生器
(To microcontroller-based design and development can output a variety of waveforms (sine wave, triangle wave, sawtooth wave, square wave, trapezoidal wave, etc.) and the frequency and amplitude variable function generator)