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PostPosted: Thu Jan 12, 2012 10:54 
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Joined: Thu Jan 12, 2012 9:34
Posts: 1
hi;
i want to display the following data on my lcd screen.

volts(V) Amps()
9.0 3.0

it is displaying on the proteous simulator well but when i tried it to disply practically on hardware it just displayd first line with second line blank :-(

i am using 89c52 microcontroller and JHD 162A LCD 16x2 display. i am using assembly to program it. Following is my code:

;..................program for LCD Display............................................................................................................
RS BIT P2.0
RW BIT P2.1
E BIT P2.2

ORG 00H

MAIN: MOV DPTR, #MYCOM

C1: CLR A
MOVC A,@A+DPTR
ACALL COMNWRT ; call command subroutien
ACALL DELAY ; GIVE LCD some time to process
INC DPTR
JZ SEND_DATA
SJMP C1

SEND_DATA: MOV DPTR,#MYDATA_1
D1: CLR A
MOVC A,@A+DPTR
ACALL DATAWRT ; Call data subroutien
ACALL DELAY
INC DPTR
JZ NEXT
SJMP D1


NEXT: MOV A,#06H ; i think problem is in this routine
CALL COMNWRT
CALL DELAY

MOV A,#0C2H
CALL COMNWRT
CALL DELAY


MOV A,#10011001B ;4,,,12V
CALL FORM_DATA


MOV A,#0C9H
CALL COMNWRT
CALL DELAY

MOV A,#01100110B; 1,,, 3A
CALL FORM_DATA


SJMP $


FORM_DATA: ; im skiping mathamatical manipulations here for simplicity.

DISPLAY: ADD A,#48 ; Convert data to ASCII codes and sent to lcd for display
MOV P0,A
CALL DATAWRT
CALL DELAY
RET


COMNWRT: MOV P0,A ;Send command to lcd
CLR RS ; RS=0 for command register
CLR RW ; R/W=0 for write
SETB E ; E=1 for high pulse
ACALL DELAY
CLR E ;E=0 FOR low pulse

RET


DATAWRT: MOV P0,A ;Copy data to port 1
SETB RS ; RS=1 For data register
CLR RW
SETB E
ACALL DELAY
CLR E
RET


MYCOM: DB 38H,0CH,01H,06H,80H,0 ; COMMANDS


MYDATA_1: DB "VOLTS(V) AMPS(A)"


DELAY: MOV R3,#50
HERE2: MOV R4,#255
HERE: DJNZ R4, HERE
DJNZ R3, HERE2

RET

i will be very thankfull to you for your help.

Regards
Qaisar Azeemi


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