If you are talking about the MPLAB C18 LCD libraries, I had a tough time
getting them to work, but finally I managed it.  After you make your
changes to the xlcd.h (not xlcd.c) you need to run the makeonep.bat like
this:

        makeonep 18f452

=DDf in fact you are using 18f452.  One thing to note that, the output
might give errors like unknown filename and so on when the bat file is
run.  The workaround I found for this is to uninstall mplab c18.  Then
reinstall in a root directory like: C:\MPLAB18  (no more than 8
characters).  And say yes to everything it asks after the setup (puts
the install directory to path).

After this you will need to make sure that there are no errors so try
the following:

        makeonep 18f452 > c:\cmpout.txt

Which will put the output of the batch file to the specified file.
After it is done, open the file and look for any errors.  If there is
(e.g. I had to put the c:\progra~1\mplab to the path myself, it was not
in the path, therefore, the compiliation did not work successfully) you
need to fix it.

Also, after you compile, check the p18f452.lib file in the lib directory
to see if the size is similar to the original file.  If the compile was
not complete then the library seems to be smaller in size.  After
recompiling my p18f452.lib is 464KB.

Also make sure that the DelayFor18TCY function is correctly written
according to your clock speed.  I also found some errors (I think) in
the openxlcd function so without chaning that I added one more function
to my software which you can find below.

In the main program all I do is set the tris' correctly and then call
the InitializeLCD function which is below.  The commands sent to the lcd
is for 4bit mode!

I hope this helps, this is everthing I did to get the LCD library to
work.

void InitializeLCD(void)
{
        char data[] =3D "Testing LCD function";
        char data2[] =3D "  I hope it works   ";
=09
        ADCON1 =3D 0x06;
        PORTA =3D TRISA =3D 0;
        PORTB =3D TRISB =3D 0;
        PORTC =3D TRISC =3D 0;

        OpenXLCD(FOUR_BIT & LINES_5X7);         // configure external
LCD

        // Set data interface width, # lines, font
        while(BusyXLCD());              // Wait if LCD busy
        WriteCmdXLCD(0x20);          // Function set cmd

        // Turn the display on then off
        while(BusyXLCD());              // Wait if LCD busy
        WriteCmdXLCD(DOFF&CURSOR_OFF&BLINK_OFF);        // Display
OFF/Blink OFF
        while(BusyXLCD());              // Wait if LCD busy
        WriteCmdXLCD(DON&CURSOR_OFF&BLINK_OFF);           // Display
ON/Blink ON

        // Clear display
        while(BusyXLCD());              // Wait if LCD busy
        WriteCmdXLCD(0x01);             // Clear display

        // Set entry mode inc, no shift
        while(BusyXLCD());              // Wait if LCD busy
        WriteCmdXLCD(0x06);   // Entry Mode

        // Set DD Ram address to 0
        while(BusyXLCD());              // Wait if LCD busy
        SetDDRamAddr(0x80);             // Set Display data ram address
to 0

        while(BusyXLCD());
        putsXLCD(data);

        while(BusyXLCD());
        SetDDRamAddr(0x80);

        while(BusyXLCD());
        putsXLCD(data);

        while(BusyXLCD());
        SetDDRamAddr(0x94);

        while(BusyXLCD());
        putsXLCD(data2);

        while(BusyXLCD());              // Wait if LCD busy
        WriteCmdXLCD(DON&CURSOR_OFF&BLINK_OFF);           // Display
ON/Blink ON

        return;
}

=D6mer YALHI
oyalhi@teksan.com.tr
http://www.teksan.com.tr
Tel : +90 212 613 22 00
Fax: +90 212 544 70 35



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Jim Main
Sent: Thursday, January 03, 1980 9:27 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]: PIC C18 LCD libraries and PICDEM 2 Plus board


Has anyone managed to get the LCD to work on the Picdem 2 plus board,
using the C18 library functions?

I can't get it to work so far.

I've changed the relevant port pins and recompiled the xlcd.c file, but
to no avail...

Jim

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