You can read from the DDRAM for that line, byte by byte, invert the it and
write it back.
Or you can go through the CGRAM, the character that you need a byte at a
time, invert the byte and write it out to the DDRAM.




-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Peter Feucht
Sent: July 19, 2009 5:43 AM
To: Microcontroller discussion list - Public.
Subject: [EE:] Inverted LCD display

Hi, all,

sitting here on Sunday writing some code snippets to test my LCD...

It's a 4 line LCD matrix text display, 40 characters each line, type
EAW404B-NLW from Electronic Assembly.
Everything works so far, I can write characters.

My application needs to show a list of items shown in 4 lines, the user can
then choose one of them by moving a cursor.
BUT: I need to indicate the selected item by *inverting* the line.
I read the data sheet over and over but cannot find any hint how to invert
the displayed information. And no chance to call the manufacturer for it's
Sunday...

Has anybody done this before?

Any help greatly appreciated!

Thanks and have a nice weekend.

Peter 

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