11 19金祥 .txt

超声波测距仪完整c51程序

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
#define c 172
unsigned char code table1[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,  //数字编码
                        0xf8,0x80,0x90};

uchar code table[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02, //带小数点的编码
                        0x78,0x00,0x10};
uchar cc,A1,A2,A3,A4;
sbit p10=P1^0;
sbit p11=P1^1;
sbit p12=P1^2;
sbit p32=P3^2;
sbit p13=P1^3;
sbit p16=P1^6;
sbit p20=P2^0;
sbit p21=P2^1;
sbit p22=P2^2;
sbit p23=P2^3;
sbit p24=P2^4;
sbit p25=P2^5;
sbit p26=P2^6;
sbit p27=P2^7;

unsigned long tt;
bit flag;

void delay(uchar x)
{
	uchar a,b;
	for(a=x;a>0;a--)
		for(b=60;b>0;b--);
}

void delay1(uchar y)
{
	uchar a,b;
	for(a=y;a>0;a--)
		for(b=20;b>0;b--);
}

void display(uchar A1,uchar A2,uchar A3,uchar A4)         
{  	   P0=A1;
       p22=0;
       p21=p20=p23=1;
	   delay(20);
       P0=A2;
       p23=0;
       p20=p22=p21=1;
	   delay(20);
       P0=A3;
       p20=0;
       p22=p21=p23=1;
	   delay(20);
	   P0=A4;
	   p21=0;
	   p23=p22=p20=1;
	   delay(20);
	   EX0=0;
}


void main()					
{	
	flag=cc=tt=0;
	P0=0xFF;
 	P2=0xFF;
	TMOD=0x12;
	IP=0x08;							
	TH0=243;
	TL0=243;
	EA=1;						
	ET0=1;
	IT0=1;			//负跳变			
  	TR0=1;	
	while(1)
	
	{
			  
				
			
 			if(flag==1)
		   {
			tt=TH1;
			tt=(tt<<8|TL1);	
			tt=tt*c/10000;
			
		    A1=table1[tt/1000];
            A2=table1[tt/100%10];
            A3=table1[tt/10%10];
	        A4=table1[tt%10];
		 	display(A1,A2,A3,A4);
           }
	}
}

void timer0() interrupt 1 
{
	uchar fa;
	p10=!p10;
	cc++;
	if(p24==0&&cc>2||p25==0&&cc>7||p26==0&&cc>19)
	fa=1;
	if(p27==0) 
	TR0=0;
	if(fa==1) 
	{TR0=0;
	 ET0=0;	
	 delay1(18);
	 TF1=0;
	 IE0=0;
	 ET1=1;	
	 TH1=0;						
  	 TL1=0;  
	 TR1=1;
	 EX0=1;
	}
		
}

void timer1() interrupt 3 using 3	
{	TR1=0;					
	EX0=0;
	TF1=0;
	
	p11=0;
	delay(55);
	p11=1;
	
}

void inter0() interrupt 0 using 2
{	 
	 TR1=0;
	 ET1=0;
   	 EX0=0;
	 flag=1;
}