基于DDS的信号发生源代码，可通过键盘调节步进来控制频率的输出，步进值1K,10K,100K,并通过1602液晶显示。-The signal based on DDS source code can be entered through the keyboard control of the frequency regulating the output of step, step value of 1K, 10K, 100K, and by 1602 LCD.