8051 LCD interfacing for sending string
Assembly Code for Sending String to LCD using microcontroller 89c52 / 89s52
Hello guys, this is a working code for sending string to 8051 LCD interfaced. You may use this with AVR microcontrollers with little amendments. In case of any difficulty just write down in comments and you will get the answer within 24 hrs. 8051 LCD interfacing requires perquisite knowledge of microcontrollers and LCD pin description. This 8051 lcd code has been tested recently and adapted in heat monitoring sysytem.
;THIS PROGRAM DISPLAY STRING "JAMAL EL-640-07" ON LCD
;PROGRAMER: JAMAL
;SEMESTER: 5EL(A)
;PROGRAM NAME: LCD DISPLAY STRING ON LCD
;MICROCONTROLLER: ATMEL AT89S52
;*****************************************************************************************
org 00H
rs equ P1.5
rw equ P1.6
en equ P1.7
nam equ P3
OUTPUT_ADC EQU P2
STR_PTR EQU 35H
;*******************************************************************************************
CLR EN
LCALL SEND_STRING
HERE:SJMP HERE
;*******************************************************************************************
SEND_STRING: lcall initlcd
mov dptr,#string
MOV STR_PTR,#0FFH
STRING_ROUTINE:
INC STR_PTR
MOV A,STR_PTR
MOVC A,@A+DPTR
CJNE A,#'$',DISP_AGN
JMP EXIT_LCD_MSG
DISP_AGN: mov nam,a
setb rs
CLR RW
setb en
clr en
lcall waitlcd
JMP STRING_ROUTINE
EXIT_LCD_MSG:
RET
;*********************************************************************************************
waitlcd: mov nam,#0FFh
clr en
clr rs
setb rw
setb en
mov a,nam
jb acc.7,waitlcd
clr en
ret
;*********************************************************************************************
initlcd: MOV R0,#04H
MOV nam,#38H
INIT_LCD1: CALL WR_LCD_COMMAND
DJNZ R0,INIT_LCD1
lcall waitlcd
mov nam,#0Eh
CALL WR_LCD_COMMAND
lcall waitlcd
mov nam,#01h
CALL WR_LCD_COMMAND
lcall waitlcd
mov nam,#0C0h
CALL WR_LCD_COMMAND
lcall waitlcd
ret
;************************************************************************************************
writetext: mov nam,a
setb rs
CLR RW
setb en
clr en
lcall waitlcd
ret
;************************************************************************************************
WR_LCD_COMMAND: CLR rs
CLR rw
SETB en
CLR en
RET
;************************************************************************************************
org 100h
STRING: DB 'JAMAL EL-640-07$'
;************************************************************************************************
end
Posted by Unknown
on 09:35. Filed under
LCD command codes,
Microcontroller
.
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