用于avr单片机通过PWM口直接调制播放音乐代码，音乐数据以数组形式储存在eeprom，可根据条件修改，具有参考价值。-Avr microcontroller for direct modulation via PWM port the code to play music, the music data is stored in an array eeprom, you can modify according to the conditions, with the reference val