8279驱动.c

8279驱动程序 智能小车程序 键码程序 水温控制系统程序

#include<reg51.h>
#include<absacc.h>
#define COM XBYTE[0x2021]
#define DAT XBYTE[0x2020]
#define uchar unsigned char

uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,
                    0x77,0x7c,0x39,0x5e,0x79,0x71};    /* ??? */
uchar idata diss[]={0,1,2,3,4,5,6,7};
sbit clflag=ACC^7;
uchar keyin();
uchar deky();
void disp(uchar idata *d);

void main(void)
{ uchar i;
  COM=0xd1;          /* ??????        */
  do {ACC=COM;}
  while(clflag==1); /* ????,??????*/
  COM=0x00;         /* 8???????      */
  COM=0x23;         /* 12??              */
  for(;;)
  { for(i=0;i<8;i++)
    { disp(diss);  /*???????*/
      diss[i]=keyin();/*??????????*/
     }
   }
}
void disp(d)/*????,????d?????*/
uchar idata *d;
{ uchar i;
  COM=0x90;/*?????????1,???????ram?0000*/
  for(i=0;i<8;i++)
  { COM=i+0x80;
    DAT=table[*d];
    d++;
   }
}
uchar keyin(void)/*?????*/
{ uchar i;
  while(deky()==0);/*??????*/
  COM=0x40;/*?fifo ram??*/
  i=DAT;
  i=i&0x3f;/*????6?*/
  return(i);/*????*/
}
uchar deky(void)/*??fifo??????*/
{ uchar k;
  k=COM;
  return(k&0x0f);/*????*/
}