单片机设计的四个按键发音
![](http://m.amcfsurvey.com/editerupload/fetch/20161101/319166_1_0.jpg)
程序实现功能:
实现四个按键发出不同的音调,代码如下:
#include
#define uchar unsigned char
#define uint unsigned int
sbit BEEP = P3^7;
//将P3.7接口赋予BEEP(接喇叭)
sbit K1
= P1^4;
//将P1.4接口赋予K1
sbit K2
= P1^5;
//将P1.5接口赋予K2
sbit K3
= P1^6;
//将P1.6接口赋予k3
sbit K4
= P1^7;
//将p1.7接口赋予K4
//延时
void DelayMS(uint x)
{
while(x--)
{
for(t=0;t<120;t++);
}
}
void Play(uchar t)
{
for(i=0;i<100;i++)
{
BEEP = ~BEEP;
//半个周期取反一次
DelayMS(t);
//延时
}
BEEP = 0;
}
void main()
{
while(1)
{
if(K1==0) Play(1);
if(K2==0) Play(2);
if(K3==0) Play(3);
if(K4==0) Play(4);
}
}
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