仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）
单片机源程序如下:
- #include<reg52.h>
- #define uint unsigned int
- #define uchar unsigned char
- sbit speaker=P3^0; //??????????,???I/O???????????????????I/O????
- //sbit speaker1=P1^1; //????????I/O???,???????
- uint k,i;
- unsigned char timer0h,timer0l,time;
- //???
- code unsigned char sszymmh[]={
- 5,1,1, 5,1,1, 6,1,2, 5,1,2, 1,2,2, 7,1,4,
- 5,1,1, 5,1,1, 6,1,2, 5,1,2, 2,2,2, 1,2,4,
- 5,1,1, 5,1,1, 5,2,2, 3,2,2, 1,2,2, 7,1,2, 6,1,2,
- 4,2,1, 4,2,1, 3,2,2, 1,2,2, 2,2,2, 1,2,4};
- // ????? ???
- code unsigned char FREQH[]={
- 0xF2,0xF3,0xF5,0xF5,0xF6,0xF7,0xF8,
- 0xF9,0xF9,0xFA,0xFA,0xFB,0xFB,0xFC,0xFC, //1,2,3,4,5,6,7,8,i
- 0xFC,0xFD,0xFD,0xFD,0xFD,0xFE,
- 0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFF,
- } ;// ????? ???
- code unsigned char FREQL[]={
- 0x42,0xC1,0x17,0xB6,0xD0,0xD1,0xB6,
- 0x21,0xE1,0x8C,0xD8,0x68,0xE9,0x5B,0x8F, //1,2,3,4,5,6,7,8,i
- 0xEE,0x44, 0x6B,0xB4,0xF4,0x2D,
- 0x47,0x77,0xA2,0xB6,0xDA,0xFA,0x16,
- };
- void delay(unsigned char t)
- {
- unsigned char t1;
- unsigned long t2;
- for(t1=0;t1<t;t1++)
- {
- for(t2=0;t2<8000;t2++)
- {
- ;
- }
- }
- TR0=0;
- }
- void t0int() interrupt 1
- {
- TR0=0;
- speaker=!speaker;
- TH0=timer0h;
- TL0=timer0l;
- TR0=1;
- }
- void song()
- {
- TH0=timer0h;
- TL0=timer0l;
- TR0=1;
- delay(time);
- }
- void delay_()
- {
- uchar a,b;
- for(a=500;a;a--)
- {
- for(b=500;b;b--);
- }
- }
- void main(void)
- {
- uchar tmp=1;
- speaker=0; //??I/O??????????
- //unsigned int k,i;
- TMOD=1; //?CT0??????1
- EA=1;
- ET0=1;//IE=0x82 //CPU???,CT0???
- while(1)
- {
- i=0;
- while(i<75)
- { //?????? ,??????
- k=sszymmh[i]+7*sszymmh[i+1]-1;
- timer0h=FREQH[k];
- timer0l=FREQL[k];
- time=sszymmh[i+2];
- i=i+3;
- song();
- }
- P0=(~tmp);
- delay_();
- tmp<<=1;
- if(tmp==0)//?????????1
- {
- tmp=1;
- }
- }
- }
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