//学习板唱歌程序(两只老鼠)
#include<reg51.h>
#define u_char unsigned char
#define u_int unsigned int
sbit spk=P3^4;
u_int m,i;
u_int rti;
u_int l;
//音频表：高位,低位
u_char code toneth[14]={0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0x0f,0xff};
u_char code tonetl[14]={0x22,0x56,0x85,0x9a,0xc1,0xe3,0x03,0x10,0x2b,0x42,0x4c,0x60,0x71,0x81};

//乐谱1

u_char code song[]="123112313455345556543256543215111511";
u_char code length[]="444444444444444422224422224422224444444444";
//定时器0中断服务程序
void timer0(void)interrupt 1 using 1
{
spk=!spk;
TH0=toneth[rti];
TL0=tonetl[rti];
}

//定时器中断服务程序
void timer1(void)interrupt 3 using 3
{
TH1=0x0c;
TL1=0xdc;
m++;
}
//音符到音频换程序
playc(char ch)
{
  int ti;
  switch(ch)
  {
   case'q':ti=0;break;
   case'w':ti=1;break;
   case'e':ti=2;break;
   case'r':ti=3;break;
   case't':ti=4;break;
   case'y':ti=5;break;
   case'u':ti=6;break;
   case'1':ti=7;break;
   case'2':ti=8;break;
   case'3':ti=9;break;
   case'4':ti=10;break;
   case'5':ti=11;break;
   case'6':ti=12;break;
   case'7':ti=13;break;
   case' ':ti=50;break;
   default:ti=50;break;
}
if (ti==50)
  return(100);
return(ti);
}

//主程序
void main(void)
{
  m=0;
  TMOD=0x11;
  spk=0;
  TH0=toneth[0];
  TL0=tonetl[0];
  TH1=0x0c;
  TL1=0Xdc;
  IP=0x08;
  EA=1;
  ET0=1;
  ET1=1;
  TR0=1;
  TR1=1;
  for (i=0;i<37;i++)
  {
   rti=playc(song);
   l=length-0x30;
   do {}while (m<l);
   m=0;
  }
  TR0=0;
  TR1=0;
  spk=0;
}

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