实现正弦波、三角波、方波的选择，且可以中途刷新；波形的相关参数如幅度、初始相位、频率可调。每周期波形所取的点数由 用户确定。 -Achieve sinusoidal, triangle wave, square wave of selection, and can be set half-way waveform parameters such as amplitude, initial phase, frequency adjustable. Waveform per cycle c