#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uint code tone[]={
1012,956,852,759,716,638,568,506,478,426,379,}; //C大調對應的半音
uint code song[]={
1,1,5,5,6,6,5,
4,4,3,3,2,2,1,
5,5,4,4,3,3,2,
5,5,4,4,3,3,2,
1,1,5,5,6,6,5,
4,4,3,3,2,2,1,
0x00}; //小星星樂譜
uchar code beat[]={1,1,1,1,1,1,2,
1,1,1,1,1,1,2,1,1,1,1,1,1,2,
1,1,1,1,1,1,2,1,1,1,1,1,1,2,
1,1,1,1,1,1,2};//停頓
sbit P2_4=P2^4;
uchar k;
uint low,high;
void delay(uint x)
{
uint i,j;
for(i=x;i>0;i--)
for(j=110*200;j>0;j--);
}
void init()
{
EA=1;
ET0=1;
TMOD=0x00; //方式0
}
void main()
{
init();
while(1)
{
if(song[k]!=0x00)
{
P2_4=0;
TR0=1;
TH0=(8192-tone[song[k]])/32;
TL0=(8192-tone[song[k]])%32;
delay(beat[k]);
k++;
}
else
{
TR0 = 0;
P2_4 = 1;
delay(100);
k=0;
}
}
}
void tone0_timer()interrupt 1 //定時器產生不同的聲音
{
TH0=(8192-tone[song[k]])/32;
TL0=(8192-tone[song[k]])%32;
P2_4=~P2_4;
}
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