void main()
{
P3=0xFF;
P0=0xff;
while(1)
{
choiceADC(0);
delay(1);
display(vvv);
}



#include
#include
#define uchar unsigned char
#define uint unsigned int

sbit OE =P2^7;
sbit EOC =P2^6;
sbit start=P2^5;
sbit CLOCK=P2^4;
sbit CS4 =P2^3;
sbit CS3 =P2^2;
sbit CS2 =P2^1;
sbit CS1 =P2^0;
uint vvv,vot;
uchar tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
void delay(uint ms)
{
uchar j;
while(ms--)
for(j=0;j<120;j++);
}
void ADCread()
{
start=0;
start=1;
start=0;//開始轉換
while(EOC==0);//等待轉換結束
OE=1;
vvv=P1;//向單片機發(fā)出轉換結果存VVV中
OE=0;
}
void votexcheng()//根據(jù)顯示要求換算成顯示電壓值
{
/**單片機8為對應最大數(shù)255，對應最大電壓V（此處為5V）換算如下**/
vot=vvv*5/255;//如最大量程8V，則乘800，依次類推
}
void display(uint dat)
{
CS1=1;CS1=0;CS3=0;CS4=0;
P0=~tab[dat/100|0x80];
delay(1);
P0=0xff;
CS1=0;CS1=0;CS3=1;CS4=0;
P0=tab[dat%100/10];
delay(1);
P0=0xff;
CS1=0;CS1=0;CS3=0;CS4=1;
P0=tab[dat%10];
delay(1);
P0=0xff;
}
void t0() interrupt 1
{
CLOCK=~CLOCK;
}
void t0_init()//開啟定時器定時，計時滿后產生中斷以便產生CLK時鐘
{
TMOD=0x02;
TH0=0x14;
TL0=0x00;
TR0=1;
ET0=1;
EA=1;
}
void main()
{
t0_init();
while(1)
{
ADCread();
votexcheng();
display(vot);
}
}