adc0809.c

adc0809采集程序

/************************************************
By ZhuTao
********************************************/
#include <reg51.h>
#include<absacc.h>
#include "numcode.h"
#define uchar unsigned char
#define uint unsigned int
uchar chnn;
#define adin XBYTE[0x7ff8+chnn]

static float C;

void delayus(uint us)
{
   while(us--);
}


uchar ad_action(uchar chn)
{
   uchar read_data;
   chnn=chn;
   adin=chn;
   delayus(15);
   read_data=adin;
   return read_data;
}     


void ad0()
{
   C=(ad_action(0)/255.0)*5.0+0.0009;	 //0.003为校准ad的误差 
}