c8279s.c

来自「<单片机程序设计基础>一书的配套光盘中的程序---北航---周航慈-」· C语言 代码 · 共 52 行

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

 uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
              0x07,0x7f,0x6f,0x77,0x7c,0x39,0x79,0x71};
 uchar idata diss[8]={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;COM=0x2a;
   while(1)
   { for(i=0;i<8;i++)
     { disp(diss);
       diss[i]=keyin();
     }
   }
 }
 void disp(d)
 uchar idata *d;
 {  uchar i;
    COM=0x90;
    for(i=0;i<8;i++)
    { COM=i+0x80;
      DAT=table[*d];
      d++;
    }
 }
 uchar keyin(void)
 {  
    uchar i;
    while(deky()==0);
     COM=0x40;
     i=DAT;i=i&0x3f;
    return(i);
 }
 uchar deky(void)
 { uchar k; 
   k=COM; 
   return(k&0x0f);
 }