实现按键弹奏音乐，最后一个按键实现蜂鸣器唱歌，基于DSP的，上课的实验内容。-Play music, and finally realize button a button and realize the buzzer singing, based on DSP, class experiment content.

DSP28335利用gpio接蜂鸣器，此程序可播放音乐-Using GPIO with a DSP28335, this program can play music