51常用子程序。包括：液晶，ad，da，音乐播放，打印，电机，查表，通讯等等好多好东西。-51 commonly used subroutines. Include: LCD, ad, da, music players, printing, electrical, inventory, communications and so on a lot of good things.

清点和检查提供的IP音频处理单元文档的数量和内容。-Inventory and inspection to provide audio processing unit of the IP number and content of documents.