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利用单片机实现简单的按不同的键

 #include<reg51.h>

#define uint unsigned int
#define uchar unsigned char
#define ulong unsigned long
sbit beep=P3^7;   //蜂鸣器输出引脚

uchar th0_f; //中断装载T0高8位
uchar tl0_f; //T0低8位

uchar code freq[36*2]={    //音阶码表
0xf7,0xd8, //440hz , 1    //0
0xf8,0x50, //466hz , 1#   //1
0xf8,0xbc, //494hz , 2    //2
0xf9,0x26, //524hz , 2#   //3
0xf9,0x85, //554hz , 3    //4
0xf9,0xe5, //588hz , 4    //5
0xfa,0x3d, //622hz , 4#   //6
0xfa,0x92, //660hz , 5    //7
0xfa,0xdd, //698hz , 5#   //8
0xfb,0x29, //740hz , 6    //9
0xfb,0x70, //784hz , 6#   //10
0xfb,0xb0, //830hz , 7    //11
0xfb,0xef, //880hz , 1    //12
0xfc,0x29, //932hz , 1#   //13
0xfc,0x62, //988hz , 2    //14
0xfc,0x95, //1046hz, 2#   //15
0xfc,0xc7, //1108hz, 3    //16
0xfc,0xf5, //1174hz, 4    //17
0xfd,0x20, //1244hz, 4#   //18
0xfd,0x4c, //1318hz, 5    //19
0xfd,0x72, //1396hz, 5#   //20
0xfd,0x97, //1480hz, 6    //21
0xfd,0xbb, //1568hz, 6#   //22
0xfd,0xdc, //1662hz, 7    //23
0xfd,0xfb, //1769hz, `1   //24
0xfe,0x18, //1864hz, `1#   //25
0xfe,0x34, //1976hz, `2   //26
0xfe,0x4e, //2092hz, `2#   //27
0xfe,0x67, //2218hz, `3   //28
0xfe,0x7d, //2350hz, `4   //29
0xfe,0x94, //2488hz, `4#   //30
0xfe,0xa8, //2639hz, `5   //31
0xfe,0xbc, //2794hz, `5#   //32
0xfe,0xcf, //2960hz, `6   //33
0xfe,0xe0, //3136hz, `6#   //34
0xfe,0xf1, //3322hz, `7   //35
};

uchar code diaodata[30]={   //音调代码
0x10,0x0e,0x0c,0x10,0x0e,0x0c,
0x10,0x0e,0x10,0x0c,0x10,0x15,
0x13,0x10,0x13,0x15,0x15,0x13,
0x15,0x13,0x10,0x0e,0x0c,0x0e,
0x0e,0x10,0x0e,0x0c,0x0e,0x00};

uchar code jiedata[30]={    //音长代码
0x04,0x04,0x08,0x06,0x02,0x08,
0x04,0x04,0x04,0x04,0x02,0x06,
0x08,0x02,0x02,0x04,0x04,0x04,
0x04,0x08,0x02,0x02,0x04,0x04,
0x02,0x02,0x04,0x04,0x0c,0x00};

void timer0() interrupt 1 //用于产生音符的T0中断服务程序
{
      TH0=th0_f;
      TL0=tl0_f;
      beep=~beep;   //取反beep引脚，发声
}

void main(void)
{
     uchar i,j,k=0;
     uint n;
     TMOD=0X01; //T0方式1
     TR0=0;    //关闭T0（不发声）
     ET0=1;    //允许T0中断
     EA=1;     //允许总中断
     while(1)
    {
         TR0=1;   //开T0
         for(i=0;diaodata[i]!=0;i++)
        {
             th0_f=freq[diaodata[i]*2];
             tl0_f=freq[diaodata[i]*2+1];
             for(j=0;j<20000;n++);		 //(jiedata*20000)
             TR0=0;
             for(n=0;n<256;n++); //音符之间的短暂延时
             TR0=1;
        }
        TR0=0;
    }
}