51单片机制作电子琴

unsigned char tone;
unsigned char op;

sbit led=P1^1;
sbit spk=P1^0;
sbit key1=P3^2;       //两只老虎演奏按键
sbit key2=P3^3;       //1~i演奏按键
unsigned char code shuma[]={
                           

0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};

//用于使定时器初值变化以产生相应频率的定时
unsigned char code yinfu_H[]=

{0xfb,0xfc,0xfc,0xfc,0xfd,0xfd,0xfd,0xfd,0x00};          
unsigned char code yinfu_L[]=

{0xe9,0x5c,0xc1,0xef,0x45,0x92,0xd0,0xee,0x00};

void delay(unsigned int N)
{
       unsigned int j=N;
       while(j--)
       {
        unsigned char i;
        for(i=0;i<250;i++);
       }
}
unsigned  char code laohu[]=

{1,2,3,1,1,2,3,1,3,4,5,3,4,5,5,6,5,4,3,1,5,6,5,4,3,1,3,1,1,3

,1,1};//两只老虎乐谱
unsigned  char code  laohuys[]=

{220,220,220,220,220,220,220,220,220,220,235,220,220,210,150

,150,
                               

170,170,200,200,150,150,170,170,200,200,244,240,250,244,220,

250};
//定时器初始化
void initTimer(void)
{
 TMOD=0x01;
 TH0=yinfu_H[tone];
 TL0=yinfu_L[tone];
}

//定时器T0中断服务程序
void timer0(void) interrupt 1
{
 TH0=yinfu_H[tone];
 TL0=yinfu_L[tone];
 spk=~spk;        //
}

void laohu_yz()//两只老虎 演奏程序
{
 unsigned char i;
 for(i=0;i<32;i++)
 {
  led=1;
  tone=laohu[i]-1;
  delay(laohuys[i]/1.2);
  led=0;    //每个音符闪烁一次
  delay(laohuys[i]/1.5);
 }
}
void yuep_yz()//1~i音符演奏程序
{
 unsigned char i;
 for(i=0;i<16;i++)
 {
  led=1;
  if(i<8)
  {
   tone=i;
  }
  else
  {
   tone=15-i;
  }
  delay(220);
  led=0;
  delay(180);
 }
}

void jianpan()
{
  op=P2;
 switch(op)
 {
  case 0xfe:led=0;tone=0;P0=shuma[1];TR0=1;break;
  case 0xfd:led=0;tone=1;P0=shuma[2];TR0=1;break;
  case 0xfb:led=0;tone=2;P0=shuma[3];TR0=1;break;
  case 0xf7:led=0;tone=3;P0=shuma[4];TR0=1;break;
  case 0xef:led=0;tone=4;P0=shuma[5];TR0=1;break;
  case 0xdf:led=0;tone=5;P0=shuma[6];TR0=1;break;
  case 0xbf:led=0;tone=6;P0=shuma[7];TR0=1;break;
  case 0x7f:led=0;tone=7;P0=shuma[8];TR0=1;break;
  default:break;     
 }
 delay(4);
 TR0=0;
 led=1;
 P0=0xff;
}

//主程序
void main(void)
{
 initTimer();
 ET0=1;
 EA=1;

 spk=0;
while(1)
 {

  if(key1==0)//判断K1键是否按下
  {
   delay(10);
   if(key1==0)
   {
   TR0=1;
    laohu_yz();
   spk=0;
   }
  }
else if(key2==0)//判断K2键是否按下
 {
  delay(10);
  if(key2==0)
  {
  TR0=1;
  yuep_yz();
  spk=0;
  }
 }

 jianpan();//键盘检测
 }
}