测试程序.c

一个超声测距程序

#include<reg51.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char

sbit dula=P2^7;
sbit wela=P2^6;

sbit send=P1^0;

float js;
uint count=0,i=0,L,a,b;
uchar a1,a2,a3;

void display(uchar,uchar,uchar);
void delay(uchar);

uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
					
void main()
{
 EA=0;
 TMOD=0x11;
 TCON=0x51;
 TH0=0xFF;
 TL0=0xE7;
 TH1=0x00;
 TL1=0x00;

 P0=0x00;

 EA=1;
 ET0=1;
 ET1=1;
        //初始化程序//

 while(1)
 {
  while(!P1^1);
  js=TH1;
  js=js*256;
  js=js+TL1;
  js=js+i*65536;
  i=0;
  L=js*85*0.0001;


  
  a1=L/100;
  a2=L%100/10;
  a3=L%100%10;
  display(a1,a2,a3);
  
  }
}


void display(uchar bai,uchar shi,uchar ge)
{
 
  dula=1;
  P0=table[bai];
  dula=0;
  wela=1;
  P0=0xfd;
  wela=0;
  delay(1);

  dula=1;
  P0=table[shi];
  dula=0;
  wela=1;
  P0=0xfb;
  wela=0;
  delay(1);

  dula=1;
  P0=table[ge];
  dula=0;
  wela=1;
  P0=0xf7;
  wela=0;
  delay(1);
									 
}

void delay(uchar x5ms)
{
 for(b=x5ms;b>0;b--)
  for(a=1100;a>0;a--);
}


void time0_int(void) interrupt 1
{
 count++;
 send=~send;
/* if(count==6)
 {
  count=0;
  ET0=0;
  TH0=0;
  TL0=0; 
 }	 */ 
}

void time1_int(void) interrupt 3
{
 
 i++;
 TH1=0;
 TL1=0;
}