verilog写的串口控制信号发生器，能通过用串口控制产生正弦波方波等信号-written in verilog serial control signal generator, can be generated using serial control, such as sine wave square wave signals

产生正弦波、方波、锯齿波，频率可调，方波占空比可调-Generated sine wave, square wave, sawtooth wave, frequency adjustable, adjustable duty cycle square wave