#include<reg52.h>
#include "intrins.h" //调用_nop_();延时函数用
unsigned char code dispbitcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char dispbuf[4];
unsigned char getdata;
unsigned int temp;
sbit ST=P2^0;
sbit OE=P2^1;
sbit EOC=P2^2;
sbit CLK=P2^3;
sbit ALE=P2^7;
sbit P34=P2^4;
sbit P35=P2^5;
sbit P36=P2^6;
sbit P20=P3^3;
sbit P21=P3^2;
sbit P22=P3^1;
sbit P23=P3^0;
sbit P17=P1^7;
void TimeInitial();
void Delay(unsigned int i);
void TimeInitial()
{ TMOD=0x01;
TH0=(65536-200)/256;
TL0=(65536-200)%256;
EA=1;
ET0=1;
TR0=1;
}
void Delay(unsigned int i)
{
unsigned int j;
for(;i>0;i--)
{
for(j=0;j<100;j++)
{;}
}
}
void Display()
{
P1=dispbitcode[dispbuf[3]];
P20=0;
P21=1;
P22=1;
P23=1;
Delay(10);//避免闪烁
P1=0x00; //关闭一下，否则显示不全
P1=dispbitcode[dispbuf[2]];
P17=1;
P20=1;
P21=0;
P22=1;
P23=1;
Delay(10);
P1=0x00;
P1=dispbitcode[dispbuf[1]];
P20=1;
P21=1;
P22=0;
P23=1;
Delay(10);
P1=0x00;
P1=dispbitcode[dispbuf[0]];
P20=1;
P21=1;
P22=1;
P23=0;
Delay(10);
P1=0x00;
}
void main()
{
TimeInitial();
while(1)
{
P34=0; //地址通道
P35=0;
P36=0;
ALE=1;
_nop_();
_nop_();
ALE=0;
ST=1;
_nop_();
_nop_();
ST=0;
_nop_();
_nop_();
_nop_();
_nop_();
while(EOC==0);
OE=1;
getdata=P0;
OE=0;/*
temp=getdata*1.0/255*500;*/temp=getdata*200.0/255.0*12.0;
dispbuf[0]=temp/2%10;
dispbuf[1]=temp/20%10;
dispbuf[2]=temp/200%10;
dispbuf[3]=temp/2000;
Display();
}
}
void t0(void) interrupt 1 using 0
{
TH0=(65536-200)/256;
TL0=(65536-200)%256;
CLK=~CLK;
}
