adc0808.c

单片机AT89C51和ADC0808组成的模数转换程序

#include<absacc.h>
#include <AT89X51.h> 
#define uchar unsigned char
#define uchar unsigned char
#define uint  unsigned int
uchar a[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,},b[4],c=0x01;
sbit START=P2^4;
sbit OE=P2^6;
sbit EOC=P2^5;
void Delay1ms(unsigned int count)
{
unsigned int i,j;
for(i=0;i<count;i++)
for(j=0;j<120;j++);
}
 void show(void)
{ 
unsigned int r;
for(r=0;r<4;r++)
   {
    P1=(c<<r);
    P3=b[r];
	if(r==2)
	P3=P3|0x80;
    Delay1ms(1);
    
	}
}
void main(void)
{
bit a0,a1,a2,a3,a4,a5,a6,a7;
//uchar zancun;
uint shuju=0,b0=0,b1=0,b2=0,b3=0,b4=0,b5=0,b6=0,b7=0;
 while(1)
 {
  START=1;
  START=0;
  while(EOC==0)
  {
   OE=1;
    }
    shuju=P0;
	shuju=shuju*1.96;
	OE=0;
	//b[0]=a[shuju%10];
	//b[1]=a[shuju/10%10];
    //b[2]=a[shuju/100%10];
	//b[3]=a[shuju/1000];
    b[0]=a[shuju%10];
	b[1]=a[shuju/10%10];
    b[2]=a[shuju/100%10];
	b[3]=a[shuju/1000];
    show();
	}
	}