First, the beginning of the main program, then initialize variables and LCD interfaces, and initialize the square-wave generator, crystal tube, the LCD display information into the boot state. Wait action- buttons, including play button, pause button, stop button, of course, can choose to return If you choose the play button, the song number will be displayed on the LCD at the same time play the corresponding song, this time, you can press a button or next song to play on the previous or next song.

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