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#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=110;j>0;j--);
}
void display( uchar numdis )
{
uchar ge,shi,bai;
ge=numdis%10;
shi=numdis/10%10;
bai=numdis/100;
wela=1;
P0=0x7e;
wela=0;
dula=1;
P0=table[bai];
dula=0;
delayms(5);
wela=1;
P0=0x7d;
wela=0;
dula=1;
P0=table[shi];
dula=0;
delayms(5);
wela=1;
P0=0x7b;
wela=0;
dula=1;
P0=table[ge];
dula=0;
delayms(5);
}
void main( void )
{
uchar num,i;
wela=1;
P0=0x7f;
wela=0;
while(1)
{
adwr=1;
_nop_();
adwr=0;
_nop_();
adwr=1;
for(i=20;i>0;i--)
display(num);
P1=0xff;
adrd=1;
_nop_();
adrd=0;
_nop_();
num=P1;
adrd=1;
}
}
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AD转换C程序
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