天祥电子基础板该ad转换程序为什么数码管的数字始终为255？

只看该作者 · 2016-2-15 23:23

本帖最后由武进伟于 2016-2-15 23:29 编辑

#include<reg52.h>
#define unchar unsigned char
#define unint unsigned int
int c,b,s,g;
sbit cs=P0^7;
sbit duan=P2^6;
sbit wei=P2^7;
sbit wr=P3^6;
sbit rd=P3^7;
sbit led=P2^5;
unchar code table[]=
{
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7b,0x07,
0x7f,0x6f
};
void delay(unint x)
{
      unint i,j;
      for(i=x;i>0;i--)
            for(j=110;j>0;j--);
}
void display(unchar bai,unchar shi,unchar ge)
{
duan=1;
P0=table[bai];
duan=0;
P0=0xff;
wei=1;
P0=0x7e;
wei=0;
delay(1);

duan=1;
P0=table[shi];
duan=0;
P0=0xff;
wei=1;
P0=0x7d;
wei=0;
delay(1);

duan=1;
P0=table[ge];
duan=0;
P0=0xff;
wei=1;
P0=0x7b;
wei=0;
delay(1);
}
void main()
{
      cs=0;
      led=1;
      while(1)
      {

      wr=1;
      wr=0;
      wr=1;
      delay(100);

      rd=1;
      rd=0;
      delay(2);
      rd=1;
      delay(2);

      c=P1;
      b=c/100;
      s=c%100/10;
      g=c%100%10;
      display(b,s,g);
      }
}