将11520采样率(可用cooledit得到)的wav文件转换为可供串口播放的PWM文件，用windows的超级终端或者串口调试器发送到串口便可以用接在串口TxD和GND之间的喇叭听到-sampling rate of 11,520 (cooledit be available) to wav file conversion for serial PWM broadcast documents, with the Super Terminal windows or serial debuggin