#include <reg51.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
uchar code duan[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar code wei[4]={0xf7,0xfb,0xfd,0xfe };
uchar buffer[3];
uchar ad_cov();
void delay(void);
void init();
sbit ALE=P3^3;
sbit START=P3^4;
sbit OE=P3^5;
sbit EOC=P2^7;
sbit CLK=P3^7;
void main()
{
init();
while(1)
{
uchar ad;
uchar k;
float adf;
ad=ad_cov();
adf=(ad/256.0)*5.0;
for(k=0;k<3;k++)
{
uchar i1,i2,i3;
i1=(int)(adf*100)/100;//个位 //456
i2=(int)(adf*100)/10%10;//十分位
i3=(int)(adf*100)%10; //百分位
P2=wei[0];
P0=duan[i3];
delay();
P2=wei[1];
P0=duan[i2];
delay();
P2=wei[2];
P0=duan[i1]+0x80;
delay();
}
}
}
uchar ad_cov()
{
uchar ad_data;
P3=0x00;
ALE=1;_nop_();_nop_();ALE=0;
START=1;_nop_();_nop_();START=0;
while(!EOC);
OE=1;
_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
ad_data=P1;
OE=0;
return(ad_data);
}
void delay(void)
{
int i;
i=100;
while(i--);
}
void init()
{
TMOD=0X02;
TH0=156;TL0=156;
EA=1;
ET0=1;
TR0=1;
}
void TIMER0() interrupt 1
{
CLK=~CLK;
}
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