数字示波器，利用AD、DA和VGA三个外设来实现简易示波器，DA外设发送正弦波给AD外设，AD外设解析成数字信号将数据送给VGA外设进行显示。在VGA上可以看到DA外设发送的波形、波形频率和波形峰峰值。-Digital oscilloscope, the use of AD, DA and VGA three peripherals to achieve a simple oscilloscope, DA peripheral send sine wave to AD peripherals,