Interfacing Keypad and LCD..

Rushdiey · Feb 21, 2013

I got the keypade code..
But how to relate them?
This my keypad code

Code:

EN              EQU     P1.1
RW              EQU     P1.3
RS              EQU     P1.2
DP1             EQU     P3.0

                ORG     00H 
START:          ACALL   DELAY
		MOV 	R5,#28H
                ACALL   COMMAND
                MOV 	R5,#0EH
                ACALL   COMMAND
                MOV 	R5,#01H
                ACALL   COMMAND
                MOV 	R5,#06H
                ACALL   COMMAND
               	MOV 	R5,#80H
              	ACALL   COMMAND
              	;MOV	R5,#7
;LOOP:          ; ACALL 	TULIS
                
                
                
                MOV 	R5,#80H
              	ACALL   COMMAND
		MOV 	R5,#'S'
              	ACALL   TULIS
              	 MOV 	R5,#82H
              	ACALL   COMMAND
		MOV 	R5,#'A'
              	ACALL   TULIS
              	 MOV 	R5,#84H
              	ACALL   COMMAND
		MOV 	R5,#'Y'
              	ACALL   TULIS
              	 MOV 	R5,#86H
              	ACALL   COMMAND
		MOV 	R5,#'A'
              	ACALL   TULIS
              	MOV 	R5,#0C1H
              	ACALL   COMMAND
		MOV 	R5,#'C'
              	ACALL   TULIS
              	;DJNZ    R5,LOOP
;               MOV	R5,#9
;               ACALL 	TULIS
HERE:		SJMP HERE
           
                                                     
                                                                                      
    		MOV DPTR,#0150H
    		;MOV R1,#0
NEXT_CHAR: 	MOV     A,#0
	        MOVC    A,@A+DPTR
	         
 	        JZ      STRING_END
       		 ;ACALL   DELAY
		MOV R5,A
		ACALL   TULIS
                INC     DPTR
                AJMP    NEXT_CHAR
           
        

STRING_END:      SJMP $
                
CLOCK:          SETB    EN
                ACALL   DELAY_INIT
                CLR     EN
                ACALL   DELAY_INIT
                NOP
                RET
                
TULIS:	        MOV 	A,R5
		;ORL	A,#30H
                ANL 	A,#0F0H
                MOV     P1,A
                SETB    RS
                CLR     RW
                ACALL   CLOCK
                MOV 	A,R5
               ;	ORL	A,#30H
                SWAP 	A
                MOV     P1,A
                SETB    RS
                CLR     RW
                ACALL   CLOCK
                RET
                
COMMAND:        MOV 	A,R5
                ANL 	A,#0F0H
                MOV     P1,A
                CLR     RS
                CLR     RW
                ACALL   CLOCK
                MOV 	A,R5
                SWAP 	A
                MOV     P1,A
                CLR     RS
                CLR     RW
                ACALL   CLOCK
                RET

DELAY:          MOV     R7,#0FFH
DEL:            NOP
                NOP
                DJNZ    R7,DEL
                RET

DELAY_INIT:     MOV     R7,#0FFH
DEL1:           NOP
                NOP
                NOP
                NOP
                NOP
                NOP
                NOP
                DJNZ    R7,DEL1
STOP:           RET

                ORG     0150H
TABLE:       DB      ' ',0

                END

Genovator · Feb 21, 2013

This code seems to be an LCD interface code. I didn't found any segment which will help for keyboard interface....

Check this link... Might help you...
**broken link removed**

Rushdiey · Feb 28, 2013

EN EQU P1.1
RW EQU P1.3
RS EQU P1.2
DP1 EQU P3.0

ORG 00H
START: ACALL DELAY
MOV R5,#28H
ACALL COMMAND
MOV R5,#0EH
ACALL COMMAND
MOV R5,#01H
ACALL COMMAND
MOV R5,#06H
ACALL COMMAND
MOV R5,#80H
ACALL COMMAND
;MOV R5,#9

;DJNZ R5,LOOP

;MOV R5,#82H
;ACALL COMMAND
;MOV R5,#9
;ACALL TULIS
;MOV R5,#0C0H
;ACALL COMMAND
;MOV R4,#'A'
;ACALL HURUF
;LOOP:
MOV P3,#0F0H
SCAN: MOV P3,#0FEH
JB P3.4, NEXT1;0
JNB P3.4, $
MOV R5,#'0'
ACALL TULIS
JMP SCAN
NEXT1: JB P3.5, NEXT2;1
JNB P3.5, $
MOV R5,#'4'
ACALL TULIS
JMP SCAN
NEXT2: JB P3.6, NEXT3;2
JNB P3.6, $
MOV R5,#'8'
ACALL TULIS
JMP SCAN
NEXT3: JB P3.7, NEXT4;3
JNB P3.7, $
MOV R5,#'C'
ACALL TULIS
JMP SCAN
NEXT4: MOV P3,#0FDH
JB P3.4, NEXT11;4
JNB P3.4, $
MOV R5,#'1'
ACALL TULIS
JMP SCAN
NEXT11: JB P3.5, NEXT12;5
JNB P3.5, $
MOV R5,#'5'
ACALL TULIS
JMP SCAN
NEXT12: JB P3.6, NEXT13;6
JNB P3.6, $
MOV R5,#'9'
ACALL TULIS
JMP SCAN
NEXT13: JB P3.7, NEXT14;7
JNB P3.7, $
MOV R5,#'D'
ACALL TULIS
JMP SCAN
NEXT14: MOV P3,#0FBH
JB P3.4, NEXT21;8
JNB P3.4, $
MOV R5,#'2'
ACALL TULIS
JMP SCAN
NEXT21: JB P3.5, NEXT22;9
JNB P3.5, $
MOV R5,#'6'
ACALL TULIS
JMP SCAN
NEXT22: JB P3.6, NEXT23;A
JNB P3.6, $
MOV R5,#'A'
ACALL TULIS
JMP SCAN
NEXT23: JB P3.7, NEXT24;B
JNB P3.7, $
MOV R5,#'E'
ACALL TULIS
JMP SCAN
NEXT24: MOV P3,#0F7H
JB P3.4, NEXT31;C
JNB P3.4, $
MOV R5,#'3'
ACALL TULIS
JMP SCAN
NEXT31: JB P3.5, NEXT32;D
JNB P3.5, $
MOV R5,#'7'
ACALL TULIS
JMP SCAN
NEXT32: JB P3.6, NEXT33;E
JNB P3.6, $
MOV R5,#'B'
ACALL TULIS
JMP SCAN
NEXT33: JB P3.7, SCAN2;F
JNB P3.7, $
MOV R5, #01H
ACALL COMMAND
MOV R5,#'='
ACALL TULIS
SCAN2: JMP SCAN

;DJNZ R5, TEST
;TEST: LJMP LOOP

HERE: SJMP HERE

MOV DPTR,#0150H
;MOV R1,#0
NEXT_CHAR: MOV A,#0
MOVC A,@A+DPTR

JZ STRING_END
;ACALL DELAY
MOV R5,A
ACALL TULIS
;MOV R4,A
;ACALL HURUF
INC DPTR
AJMP NEXT_CHAR

STRING_END: SJMP $

CLOCK: SETB EN
ACALL DELAY_INIT
CLR EN
ACALL DELAY_INIT
NOP
RET

TULIS: MOV A,R5
;ORL A,#30H
;ANL A,#0F0H
MOV P1,A
SETB RS
CLR RW
ACALL CLOCK
MOV A,R5
;ORL A,#30H
;ANL A,#0F0H
SWAP A
MOV P1,A
SETB RS
CLR RW
ACALL CLOCK
RET

;HURUF: MOV A,R4
;ORL A,#30H
;ANL A,#0F0H
;MOV P1,A
;SETB RS
;CLR RW
;ACALL CLOCK
;MOV A,R4
;ORL A,#30H
;ANL A,#0F0H
;SWAP A
;MOV P1,A
;SETB RS
;CLR RW
;ACALL CLOCK
;RET

COMMAND: MOV A,R5
ANL A,#0F0H
MOV P1,A
CLR RS
CLR RW
ACALL CLOCK
MOV A,R5
SWAP A
MOV P1,A
CLR RS
CLR RW
ACALL CLOCK
RET

DELAY: MOV R7,#0FFH
DEL: NOP
NOP
DJNZ R7,DEL
RET

DELAY_INIT: MOV R7,#0FFH
DEL1: NOP
NOP
NOP
NOP
NOP
NOP
NOP
DJNZ R7,DEL1
STOP: RET

ORG 0150H
TABLE: DB '0',0

END

This is my new code..
Now the problem how to make when u press buton 1 it show 1 press 2 time show number..

pasicr · Feb 28, 2013

Hi there,
read this (sch and working code)
https://www.mikroe.com/add-on-boards/various/keypad-4x4/
regards

Debasis Swain · Mar 1, 2013

I have seen your code but it is not user friendly.so, 1st check your logic with what you want to display for your key pressed.

Rushdiey · Mar 5, 2013

my problem is.. how tom make table?

Dalvir · Mar 5, 2013

if u have any dot in program then chech the page number 302, for lcd and 313 for key pad for 4x4 of book "the 8051 micro controller & embedded system using c" writer is muhammand ali mazidi code is in assemble language if u have still problem then i send u working code hex file .

Rushdiey · Mar 5, 2013

Dalvir said:
if u have any dot in program then chech the page number 302, for lcd and 313 for key pad for 4x4 of book "the 8051 micro controller & embedded system using c" writer is muhammand ali mazidi code is in assemble language if u have still problem then i send u working code hex file .

I hope u can send the hex. Btw, I don't have the book

Genovator · Mar 5, 2013

You can search in google with the name of the book. You can get some download link....

Dalvir · Mar 6, 2013

ok i send u hex file send email id

Rushdiey · Mar 7, 2013

Dalvir said:
ok i send u hex file send email id

rusydiey@yahoo.com.my

- - - Updated - - -

Dalvir said:
if u have any dot in program then chech the page number 302, for lcd and 313 for key pad for 4x4 of book "the 8051 micro controller & embedded system using c" writer is muhammand ali mazidi code is in assemble language if u have still problem then i send u working code hex file .

Already found the book.. But also cant solve my problem

Dalvir · Mar 7, 2013

#include<reg51.h>
#include"lcd.h"

#include"4x4keypad.h"
unsigned char p_w[8];
unsigned char pass_w[8]={"1223"};
unsigned char count=0x00,a,p,add=0x04;

void main()
{

lcd_init();

lcd_string(0x80,"Er. Dalvir");
lcd_string(0xc0,"");
while(1)
{

key_detection();
p_w[count]=data_display[z][y];
lcd_data(p_w[count]);
}
}

this is the program
lcd rs=P2.0
lcd en=p2.1
lcd wr=p2.2

keypad connect to p1 0to3 colum 4to7 row

- - - Updated - - -

#include<reg51.h>
#include"lcd.h"

#include"4x4keypad.h"
unsigned char p_w[8];
unsigned char pass_w[8]={"1223"};
unsigned char count=0x00,a,p,add=0x04;

void main()
{

lcd_init();

lcd_string(0x80,"Er. Dalvir");
lcd_string(0xc0,"");
while(1)
{

key_detection();
p_w[count]=data_display[z][y];
lcd_data(p_w[count]);
}
}

this is the program
lcd rs=P2.0
lcd en=p2.1
lcd wr=p2.2

keypad connect to p1 0to3 colum 4to7 row

Rushdiey · Mar 9, 2013

This is C.. Do U Have Assembly?

Interfacing Keypad and LCD..

Rushdiey

Junior Member level 2

Genovator

Advanced Member level 2

Rushdiey

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pasicr

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Debasis Swain

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Rushdiey

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Dalvir

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Rushdiey

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Genovator

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Dalvir

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Rushdiey

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Dalvir

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Rushdiey

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