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#include <reg52.h>
#include <intrins.h>
sbit EOC=P2^6;
sbit START=P2^5;
sbit OE=P2^7;
sbit CLK=P2^4;
long int a;
int b,c,d,e,f,g; //定義長(zhǎng)度為7的字符串
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x80};
void delay_display(unsigned int z) //延時(shí)子程序
{
unsigned int x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void ADC0808()
{
if(!EOC) //如果EOC為低電屏，則產(chǎn)生一個(gè)脈沖，這個(gè)脈沖的下降沿用于啟動(dòng)AD轉(zhuǎn)換
{
START=0;
START=1;
START=0;
}
while(!EOC); //等待AD轉(zhuǎn)換結(jié)束
START=1; //轉(zhuǎn)換結(jié)束后，再產(chǎn)生一個(gè)脈沖，這個(gè)脈沖的下降沿用于將EOC置為低電屏，為下一次轉(zhuǎn)換作準(zhǔn)備
START=0;
while(EOC);
}
void bianma()
{
START=0;
ADC0808();
a=P1*100;
a=a/51;
}
void yima()
{
//定義整形局域變量
b=a/1000; //取出千位
c=a-b*1000; //取出百位、十位、個(gè)位
d=c/100; //取出百位
e=c-d*100; //取出十位、個(gè)位
f=e/10; //取出十位
g=e-f*10; //取出個(gè)位
}
void display() //顯示子程序
{
P2 = 0xfe;
P0 = table[b];
delay_display(1);
P2 = 0xfd;
P0 = table[d];
delay_display(1);
P2 = 0xfd;
P0 = table[10];
delay_display(1);
P2 = 0xfb;
P0 = table[f];
delay_display(1);
P2 = 0xf7;
P0 = table[g];
delay_display(1);
}
void main()
{
EA=1;
TMOD=0X02;
TH0=216;
TL0=216;
TR0=1;
ET0=1;
while(1)
{
bianma();
yima();
display();
}
}
void t0() interrupt 1 using 0
{
CLK=~CLK;
}

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