实现频率的改变和波形的改变，用于函数发生器的设置-achieve change and the frequency of the waveform change for the installation Function Generator

在给函数发生器发生命令过程中需要改变波形频率等时候要-to function generator in order occurred process needs to change frequency waveform time to

基于LM358的波形发生器仿真测试原理图，采用压控振荡控制频率变化-LM358-based waveform generator schematic simulation test, using a voltage-controlled oscillator frequency variation control