最小单片机测试程序，有流水灯 蜂鸣器音乐请认真书写上传资料的详细功能、包含内容说明(至少要20个字)。尽量不要让站长把时间都花费在为您修正说明上。-Smallest single-chip test program, the water lights buzzer Music upload data seriously writing more features, including content descr iption (at least 20). Try not to let the o