Conneting ATMEL 8051 to LCD

[pradyu77]

Hey!! I have some problem conneting my ATMEL 8051 kit to an LCD.. The LCD seems to be workin well but the program i write does not seem to get transferred.. I mean i have checked the program and it seems to be perfect but I am not gettin any output in the LCD.. Do we need to initialise it separately or something?? The LCD we use is a DMC 16249 and the kit is a EDS 8051 ATMEL kit..??

 

[thedesolatesoul]

You do need to initialize the LCD first. There are a few commands you have to execute before you send the actual data to the LCD.

Check this page out. It has a lot of information. Hope it helps.

http://home.iae.nl/users/pouweha/lcd/lcd1.shtml

 

[nikhilele]

i am attaching a simple program

This "hello world" type program for LCD

	.equ lcdrs,	p2.5	;Port pin for LCD RS pin   	
	.equ lcdrw,	p2.6	;Port pin for LCD R/W pin  	
	.equ lcden,	p2.7	;Port pin for LCD Enable pin 	


        mov a,#3ch
        acall comd
        mov a,#0eh
        acall comd
        mov a,#06h         
        acall comd
        mov a,#01h         
        acall comd
        mov a,#87h           
        acall comd
        mov a,#'h'
        acall disp
        mov a,#'e'
        acall disp
        mov a,#'l'
        acall disp
        mov a,#'l'
        acall disp
        mov a,#'o'
        acall disp
here:sjmp here


comd:
	acall ready
	mov p1,a
	clr lcdrs
	clr lcdrw
                setb lcden
                clr lcden
                ret 



disp:
	acall ready
	mov p1,a
                setb lcdrs
	clr lcdrw
                setb p3.4
	clr lcden
                ret 



ready:
	clr lcden
	mov p1,#0ffh
	clr lcdrs
                setb lcdrw
wait:
	clr lcden
                setb lcden
                jb p1.7,wait
	clr lcden
        ret 


        .end