at89s51 music.txt

AT89X51单片机音乐制作简易音乐盒的源程序.C语言编的..

#include <reg51.h>
unsigned char m; //m为频率常数
unsigned char n=0; //n为节拍常数
unsigned char i=0;
sbit bell=P1^1;
unsigned char code music_tab[]={0x12,0x44,0x02,0x42,
	 0x42,0x01,0x41,0x12, //格式为: 频率常数, 节拍常数, 频率常数, 节拍常数,
	 0x21,0x31,0x44,0x44,
	 0x02,0x62,0x42,0x51,
	 0x61,0x82,0x01,0x81,
	 0x84,0x62,0x01,0x61,
	 0x42,0x01,0x61,0x82,
	 0x01,0x61,0x54,0x54,
	 0x04,0x94,0x84,0x54,
	 0x64,0x82,0x64,0x82,
	 0x42,0x01,0x51,0x64,
	 0x04,0x12,0x01,0x21,
	 0x42,0x42,0x62,0x01,
	 0x61,0x82,0x82,0x22,
	 0x01,0x21,0x54,0x02,
	 0x12,0x44,0x02,0x42,
	 0x64,0x02,0x62,0x84,
	 0x0C,0x42,0x01,0x61,
	 0x82,0x01,0x81,0x94,
	 0x84,0x62,0x01,0x41,
	 0x62,0x02,0x42,0x02,
	 0x14,0x44,0x62,0x01,
	 0x41,0x82,0x82,0x62,
	 0x02,0x42,0x02,0x14,
	 0x44,0x14,0x44,0x14,
	 0x44,0x44,0x04};

void time0(void) interrupt 1 using 1 //产生10MS精确定时
{TH0=55536/256;
 TL0=55536%256;
  n--;
}
void delayms(unsigned char a) //微秒延时程序
{
  while(--a);
}
void delay(void) //延迟程序
{
 int i,j;
 for(i=50;i--;i>0)
 for(j=10000;j--;j>0)
  ;
}
void main()
{
  
   TMOD=0x01;
   TH0=55536/256;
   TL0=55536%256;
   EA=1;
   ET0=1;
   TR0=0;
   while(1)
 {
  switch(music_tab[i])
 {
   case 0x00: i=0;delay();break; //曲终停顿一定时间
   case 0xff: i=i+1;delayms(100);break; //遇到休止符停顿一定时间100微秒,再取下一个频率
   default:  m=music_tab[i++];n=music_tab[i++]; //取频率到m,取节拍到n
   TR0=1;
    while(n!=0)
     {
      bell=!bell;
      delayms(4*m); //调整产生的频率,可以通过在m前的值来修正音调的高低
      }
  TR0=0;
  }
 }
}