Hello Martijn,

Try out this code snippet - I use this as a standard routine for checking new modules .

1. This is not the whole code and only the portion that transmitts the 32 characters to the LCD after Initializing.

2. This is for a memory mapped I/O scheme - but I am sure you can convert it for a direct I/O. Just get the logic from this code.

3. This code is for the Hitachi driver HD44780.( WIth the first line at 080H and second line at 0C0H )

4. LTIME1 is just a 5ms delay routine. Use any of your own.

5. Good luck

<pre>

FSET EQU 38H ; L=1(8 BITS),N=1(2LINE) ; 001L N000
DCB EQU 0CH ; DIS.ON=1,CUR.OFF=0,BLINK OFF=0; 0000 1DCB
CLER EQU 01H ; CLR. DISP; 0000 0001
SEM EQU 06H ; ENTRY MODE; INC=1, SHIFT=0; 0000 01IS
DCON EQU 18H ; DIS & CUR CONTROL; DISSHIFT=1,LEFTWISE=0; 0001 SL00

===============

SNDLCD: ACALL LCDSET

MOV A, #80H
CALL LCDCOM
LINE1: MOV DPTR,#TXT ; START LOADING FIRST LINE
MOV R2,#16 ; 16 CHARACTERS
NXT1: MOV A,#0
MOVC A,@A+DPTR
ACALL LCDCHR
INC DPTR
DJNZ R2, NXT1

LINE2: MOV A,#0C0H ; SET ADDRESS FOR 2ND LINE
ACALL LCDCOM ; WRITE TO DDRAM
MOV DPTR,#TXT1 ; START LOADING 2ND LINE
MOV R2,#16
NXT2: MOV A,#0
MOVC A,@A+DPTR
ACALL LCDCHR
INC DPTR
DJNZ R2, NXT2

SJMP $ ; OVER. WAIT FOR RESET

TXT: DB 'This is 1st line'
TXT1: DB 'This is 2nd line'

LCDSET: MOV R6,#03
TTIMES: MOV A,#FSET
ACALL LCDCOM
ACALL LTIME1
DJNZ R6,TTIMES ; TO SEND FSET THRICE
MOV A,#DCB
ACALL LCDCOM
MOV A,#SEM
ACALL LCDCOM
MOV A,#CLER
ACALL LCDCOM
ACALL LTIME1
RET

;LCDCOM for writing a command to LCD. Call with required command in ACC

LCDCOM: MOV P2,#ADD_H MOV R0,#LCD_C
MOVX @R0,A
DELAY: MOV R3,#50 ; 100 MS DELAY FOR EACH WRITE
DLOOP: DJNZ R3,DLOOP
RET

; LCDCHR for writing one character in DDRAM. Call with ASCII info in ACC

LCDCHR: MOV P2,#ADD_H
MOV R0,#LCD_D
MOVX @R0,A
ACALL DELAY
RET

END


Raghu