為什么這個單片機4*4矩陣鍵盤不可以？

ID:949074 · 發表于 2021-7-6 23:03

#include "reg52.h"
sfr p0=0x80;
sfr p6=0xe8;
void delay(unsigned int k)
unsigned char kx(void);
{
      unsigned char a,b,c=16;
      for(a=0;a<4;a++)
            {
                     p0=_crol_(0xfe,a);
                     b=p0;
                     b=b & 0xf0;
                     if(b!=0xf0)
                     {
                              delay(50);
                              b=p0;
                              b=b & 0xf0;
                              if(b!=0xf0)
                              {
                                    b=p0;
                                    switch(b)
                                    {
                                             case 0xee:c=0;break;
                                             case 0xde:c=4;break;
                                             case 0xbe:c=8;break;
                                             case 0x7e:c=12;break;
                                             case 0xed:c=1;break;
                                             case 0xdd:c=5;break;
                                             case 0xbd:c=9;break;
                                             case 0x7d:c=13;break;
                                             case 0xeb:c=2;break;
                                             case 0xdb:c=6;break;
                                             case 0xbb:c=10;break;
                                             case 0x7b:c=14;break;
                                             case 0xe7:c=3;break;
                                             case 0xd7:c=7;break;
                                             case 0xb7:c=11;break;
                                             case 0x77:c=15;break;
                                             default:break;
                                    }
                              }
                              while((b & 0xf0)!=0xf0)
                              {
                                    b=p0;
                                    b=b & 0xf0;
                              }
                     }
            }
}
return c;
delay(unsigned int k)
{
            unsigned int i,j;
            for(i=0;i<200;i++)
                     {
                     for(j=0;j<k;j++);
                     }
}
void main()
{
      int c;
      while(1)
      {
            c=kx();
      }
}