软件ad.c

使用单片机的比较器进行AD转换

#include "at89x051.h"
#include "软件AD_1.C"
#include"INTRINS.H"
sbit p36 =P3^6;
sbit pin0=P1^0;
sbit pin1=P1^1;
sbit p14 =P1^4;
sbit h1=P3^7;						    
sbit h2=P3^3;						    
//////////////////////////////////////////////////////////////
unsigned int ad_recive()
{
unsigned int i=500,j=0;
unsigned char k=10;
while(k>0){
		if(p36){p14=1;}
		  else p14=0;
		  _nop_();
 		  k--;
		  }
	while(i>0)
		{if(p36){j++;p14=1;}
		  else p14=0;
		i--;
		} 
p14=0;
return(j);
}
//////////////////////////




main()
{
unsigned int ad,sum,sd;
unsigned char q;			   		   
hd7279_init();
wr7279(0,0);
wr7279(1,0);
wr7279(2,0);
wr7279(3,0);
p14=0;
q=0;
pin0=pin1=1;
while(1)
{
sd=ad_recive();
sum=sum+sd;
q=q+1;
if(q==10){
q=0;h1=!h1;
ad=sum/10;
wr7279(0,ad/1000);
wr7279(1,ad%1000/100);
wr7279(2,ad%1000%100/10);
wr7279(3,ad%1000%100%10);
sum=0;
}

}
}