音乐播放系统

 

 1#include<reg51.h>
 2sbit P1_7=P3^0;
 3unsigned int  code pinlu[] = {220,247,262,294,330,349,392,440,494,522};
 4unsigned char code music[]={ 0x73,0x61,0x42,0x62,0x92,0x71,0x61,0x74,-1};
 5unsigned char th_0,tl_0;
 6void delay(unsigned char time)
 7{
 8    unsigned int j;
 9    while(time--)
        for(j=0;j<10000;j++);
}
void main()
{
        unsigned char i;
        TMOD=1;
        ET0=1;
        TR0=1;
        EA=1;
        while(1)
        {
            while(music[i]!=-1)
            {
                th_0=(65536-250000/pinlu[(music[i]/16)])/256;
                tl_0=(65536-250000/pinlu[(music[i]/16)])%256;
                delay(music[i]%16);
                i++;
            }
            i=0;
        }
}
void sound() interrupt 1
{
    TH0=th_0;
    TL0=tl_0;
    P1_7=~P1_7;
}