想請大神指點一下單片機矩陣鍵盤數碼管動態顯示的問題，謝謝！

ID:730131 · 發表于 2020-4-15 22:46

代碼是這樣的，也是從論壇上看見的
#include<reg51.h>
#define KEYP P2
#define SEG7P P0
unsigned char code TAB[17]= {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
                  0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71 };
unsigned char disp[4]= {0x40,0x40,0x40,0x40};
unsigned char scan[4]= {0xef,0xdf,0xbf,0x7f};
void delay(int);//1ms
void scanner(void);

main() {

while(1) {

      scanner();

}

}

void delay(int x) {

int i,j;
for(i=0; i<x; i++)
      for(j=0;j<120;j++);
}

void scanner(void) {

unsigned char col,row,dig;
unsigned char rowkey,kcode;
for(col=0; col<4; col++)
{
      KEYP=scan[col];
      SEG7P=disp[col];
      rowkey=~KEYP&0x0f;
      if(rowkey!=0)
      {
         if(rowkey==0x01) row=0;
         else if(rowkey==0x02) row=1;
         else if(rowkey==0x04) row=2;
         else if(rowkey==0x08) row=3;

         kcode=4*col+row;

                                             if(kcode!=10&&kcode!=11){
         for(dig=3; dig>0; dig--)
            disp[dig]=disp[dig-1];
         disp[0]=TAB[kcode];
                     }

                        if(kcode==11){
         for(dig=0; dig<3; dig++)
            disp[dig]=disp[dig++];
         disp[0]=0x40;
                     }

         while(rowkey!=0)
            rowkey=~KEYP&0x0f;
      }

                                    if(kcode==10){
                                       int k;
                                             for(k=0;k<4;k++){
                                             disp[k]=0x40;
                                    }
                              }

      delay(4);

}

}