低频交流信号测量系统 采用12864屏幕实时显示交流信号波形，并测量Vpp和频率-Low frequency AC signal measurement system 12864 screen real-time display of AC signal waveform, and measuring the Vpp and frequency

本代码能够实时保存当前显示屏幕存储为bmp格式的图片-The code in real time to save the current screen is stored as a bmp format pictures