A//D转换

#include<reg52.h>

#include<intrins.h>

#define uchar unsigned char

#define uint unsigned int

sbit dula=P2^6;

sbit wela=P2^7;

sbit adwr=P3^6;

sbit adrd=P3^7;

uchar code table[]={

0x3f,0x06,0x5b,0x4f,0x66,

0x6d,0x7d,0x07,0x7f,0x6f,

0x77,0x7c,0x39,0x5e,0x79,0x71

};

void delayms(uint xms)

{

uint i,j;

for(i=xms;i>0;i--)

for(j=100;j>0;j--);

}

void display(uchar bai,uchar shi,uchar ge)

{

dula = 1;

P0=table[bai];

dula = 0;

P0=0xff;

wela=1;

P0=0x7e;

wela=0;

delayms(5);

dula=1;

P0=table[shi];

dula=0;

P0=0xff;

wela=1;

P0=0x7d;

wela=0;

delayms(5);

dula=1;

P0=table[ge];

dula=0;

P0=0xff;

wela=1;

P0=0x7b;

wela=0;

delayms(5);

}

void main()

{

uchar a,A1,A2,A3,adval;

wela=1;

P0=0x7f;

wela=0;

while(1)

{

adwr=1;
//启动A/D转换使能

_nop_();

adwr=0;

_nop_();

adwr=1;

for(a=10;a>0;a--)

{

display(A1,A2,A3);

}

P1=0xff;

adrd=1;

_nop_();

adrd=0;

_nop_();

adval=P1;

adrd=1;

A1=adval/100;

A2=adval%100/10;

A3=adval%10;

}

}

A//D转换,布布扣,bubuko.com