原创 矩阵键盘

 参考程序：

1、 ASM程序：

        ORG     0000H

        AJMP    <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />MAIN

        ORG     0030H

MAIN:   MOV     SP,#6FH

        MOV     R2,#4

        MOV     R0,#30H

        MOV  A,#1DH

LOP1:   MOV     @R0,A

        INC     R0

        DJNZ    R2,LOP1

LOOP:   ACALL   DISP

        ACALL     KEY

      MOV     A,#0FFH

      XRL       A,R3

      JZ   LOOP

      ACALL SX

      MOV     33H,R3

      SJMP     LOOP

SX:     MOV     R0,#31H

      MOV     R1,#30H

        MOV     R2,#3      

LOP2:   MOV  A,@R0

      MOV     @R1,A

      INC       R0

      INC       R1  

        DJNZ    R2,LOP2

        RET

KEY:    MOV     P1,#0F0H

      MOV     A,P1

      XRL       A,#0F0H

      JZ   NONE

      ACALL DE10

      MOV     P1,#0F0H

      MOV     A,P1

      XRL       A,#0F0H

      JZ   NONE

      MOV     A,P1

      MOV     P1,#0FH

      ORL      A,P1

      MOV     R4,A

      MOV     P1,#0F0H

LK1:     MOV     A,P1

      XRL       A,#0F0H

      JNZ       LK1

      ACALL DE10

      MOV     R5,#10H

      MOV     R3,#0

      MOV     DPTR,#TABK

LK2:     CLR       A

      MOVC  A,@A+DPTR

      XRL       A,R4

      JZ   FHK

      INC       R3

      INC       DPTR

      DJNZ     R5,LK2

NONE: MOV     R3,#0FFH

FHK:    RET

TABK:  DB  077H,0E7H,0EBH,0EDH

      DB  0D7H,0DBH,0DDH,0B7H

      DB  0BBH,0BDH,07BH,07DH

      DB  07EH,0BEH,0DEH,0EEH 

DE10:   MOV     R5,#20

      JMP       LPD1                        

DELAY:  MOV     R5,#2

LPD1:   MOV     R6,#2

LPD2:   MOV     R7,#250

        DJNZ    R7,$

        DJNZ    R6,LPD2

        DJNZ    R5,LPD1

        RET

DISP:   MOV     R2,#4

        MOV     R0,#30H

        MOV     R3,#08H

        MOV     DPTR,#TABD

LDP:    MOV     A,@R0

        MOVC    A,@A+DPTR

        MOV     P0,A

        MOV     P2,R3

        MOV     A,R3

        RL      A

        MOV     R3,A

        INC     R0

      ACALL DELAY

        DJNZ    R2,LDP

        RET

TABD:   DB      5FH,44H,3DH,6DH

        DB      66H,6BH,7BH,45H

        DB      7FH,6FH,77H,7AH

        DB      1BH,7CH,3BH,33H

        DB      0DFH,0C4H,0BDH,0EDH

        DB      0E6H,0EBH,0FBH,0C5H

        DB      0FFH,0EFH,76H,1AH

        DB      37H,00H,20H,6EH      

        END

2、 C程序：

#include <AT89X51.h>

#define uchar unsigned char

uchar data dispbit,dispbuf[4];

void delay (unsigned int count);

void display(void);

uchar key (void);

void main(void)

{

       uchar k,n;

       for (k=0;k<4;k++)

              {

              dispbuf[k]=0x1D;

              }

       do

       {

              display();

              n=key();

              if(n!=0xFF)

              {

                     for(k=0;k<3;k++)

                     {

                     dispbuf[k]=dispbuf[k+1];

                     }

                     dispbuf[3]=n;

              }

       }while(1);

}

void display(void)

{

       const uchar design[32]={0x5F,0x44,0x3D,0x6D,0x66,0x6B,0x7B,0x45,

                                   0x7F,0x6F,0x77,0x7A,0x1B,0x7C,0x3B,0x33,

                                         0xDF,0xC4,0xBD,0xED,0xE6,0xEB,0xFB,0xC5,

                                         0xFF,0xEF,0x76,0x1A,0x37,0x00,0x20,0x6E};

       uchar i;

       dispbit=0x08;

       for(i=0;i<4;i++)

       {

              P0=design[dispbuf];