通过AD9851产生正弦波，通过STC12C5A60S2单片机控制AD9851，产生扫频递增。通过按键控制扫频波的状态。按下按键1，手动递增扫频递增频率，按下按键2，产生一固定频率的正玄波，按下按键3，程序自动扫频。-Generate sine wave of AD9851, STC12C5A60S2 MCU control AD9851, generate swept increments. Wave swept through the state of the control buttons. Press button 1, manually increment increment frequency sweep, press the button 2, generated sine wave at a fixed frequency, press button 3, the program automatically sweep.