实验名称: 蜂鸣器驱动程序实验,电子琴程序 实验目的: 对单片机输入输出端口的一个小综合 实验现象: 有点声音 环 境: ICCAVR6.31A-Experiment name: buzzer driver test, keyboard test program purpose: input and output ports of the microcontroller is a small comprehensive experimental phenomenon: a litt