程序求助

只看该作者 · 2012-12-15 16:12

写了个PCF8951的程序但是显示的数字是255 调节电位器数码管没有变化，请大侠看看是哪里错了

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar code table[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
sbit    scl=P2^1;
sbit    sda=P2^0;

uchar temp; bai;  shi;ge; aa; zhi;

void delay()
{;;}
void  delay1(uint  z)
{  uint  x,y;
for(x=z;x>0;x--)
   for(y=25;y>0;y--);}
void  delay_1()
{    uint x,y;
for(x=2;x>0;x--)
   for(y=110;y>0;y--);}
void  display(uchar bai,uchar shi,uchar ge)
{
  temp=0xfe;
   P1=temp;
   P0=table[0];
   delay1(5);

   temp=0xfd;
   P1=temp;
   P0=table[bai];
   delay1(5);



   temp=0xfb;
   P1=temp;
   P0=table[shi];
   delay1(5);


   temp=0xf7;
   P1=temp;
   P0=table[ge];
   delay1(5);




   }


void init()
{ scl=1;
  delay();
  sda=1;
  delay();
}

void  start()
{sda=1;
delay();
scl=1;
delay();
sda=0;
delay();

}
void  stop()
{ sda=0;
delay();
scl=1;
delay();
sda=1;
delay();
}
void  respond()
{ uchar i=0;
scl=1;
delay();
while((sda==1)&&(i<<255))
   i++;
   scl=0;
   delay();
}

void writebyte(uchar  date)
{uchar i,temp;
temp=date;
for(i=0;i<8;i++)
{ temp=temp<<1;
   sda=CY;
   delay();
   scl=1;
   delay();
   scl=0;
   delay();
   }
   sda=1;
   delay();

}

uchar  readbyte()
{ uchar i,j,k;
  scl=0;
  delay();
  sda=1;
  delay();
  for(i=8;i>0;i--)
  { scl= 1;
delay();
j=sda;
k=(k<<1)|j;
scl=0;
delay();
   }
   return k ;

}

uchar ad()
{ init();
   start();
   writebyte(0x90);
   respond();
   writebyte(0x01);
   respond();
   delay_1();
   start();
   writebyte(0x91);
   respond();

   aa=readbyte();
   respond();
   stop ();
   return aa;

}

  void  main()
  {
   while(1)
   { zhi=ad();
      bai=zhi/100;
      shi=zhi%100/10;
      ge=zhi%100%10;
   display(bai,shi,ge);}

}