51单片机制作电子琴

#includeunsigned 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 }}