ad.c

基于MAX197的数据采集及A/D转换的实现

#include<reg51.h>
#include<stdio.h>
#include<absacc.h>
#define uchar unsigned char 
#define uint  unsigned int
sbit HBEN=P1^0;
sbit rd=P1^1;
sbit wr=P1^2;
sbit cs=P1^3;
uchar low8,high4,ad_result;
uchar sample;

void main()
{  EA=1;
   EX0=1;
   IT0=1;
   rd=1;
   wr=0;
   cs=0;
   P0=0x48;
   while(1);            //等待中断
}
void ADConvert() interrupt 0
{  HBEN=0;
   P0=0xFF;  
   low8=P0;                         //读低8位数据
   HBEN=1;
   P0=0xFF;
   high4=P0;                          //读高4位数据
   ad_result=high4*256+low8;          //数据整合
   sample=ad_result*0.00244140625;   // 10/4096=0.00244140625;
}