I have just been down this road a couple of months ago myself.

Some notes:

I would like to see the bytes mapped out on the display (pages and columns)=
 and=20
the equation of how to get to a specified pixel (Chip, y and x address to t=
he=20
display chip and byte mask - Note that y is address within a page (column) =
and=20
x is the page address).

Also note that CS1 and CS2 are active low. I spent the better part of a day=
=20
figuring out why the display showed nothing because I sent the initializati=
on=20
code to both chips at once. It was only when I changed this to just send th=
e=20
initialization to one side only, then the other side showed something - d'o=
h!

Another thing that is not clearly stated: The KS0108 works with a 3.3V=20
interface. Of the external pins controlled by the user it is only the reset=
=20
(RST) pin that needs to be driven with a 5V I/O (or a 5V tolerant pin set a=
s=20
open collector and a clamping resistor to 5V).

Also the reading and writing sequence - At some point you need to read (or=
=20
write?) to the chip twice, where one is a dummy read (or write). Don't reme=
mber=20
exactly where now. And of course - code for reading the busy signal.

I also prefer C-code compared to assembler.

I would also start with pixel setting/clearing, line drawing, block=20
filling/clearing/inverting before going to text.

If you have 1k ram available (as I have with my PIC32) it is also a lot eas=
ier=20
to write to the ram and then just dump it to the LCD when done updating.

Anyway, keep up the good work - it is nice to find a page like this if you =
are=20
starting out something new.

/Ruben

> Hi all,
>=20
> I've documented some work I've done with 128 x 64 LCDs and will
> put it up as a Help page for some students who are familiar only with
> bog-standard 16 x 2 alphanumerics
>=20
> Here's the first draft
>=20
> http://home.clear.net.nz/pages/joecolquitt/text2lcd.html
>=20
> If you could look it over
>=20
> - does it make sense ?
> - is it arranged OK ?
> - anything missing ?
> - typos ?
> - etc ?
>=20
> If / when it passes muster I'll pass it on to James to include at PICList
>=20
> TIA
>=20
> Joe
> --=20
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>=20
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Ruben J=F6nsson
AB Liros Electronic
Box 9124
200 39 Malm=F6 Sweden
Tel +46 40142078
ruben@rjjournal.net
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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