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'GUI with a 17C44 and LCD'
1997\08\02@012928 by Garrick A Kremesec

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Anyone ever do this?  A VERY SIMPLE GUI on an LCD with a 17C44?  I don't
know where to begin; I'm just curious if it has been done with any degree
of complexity.

___________________________________________________________________________
Garrick Kremesec                  | "There is no witness so dreadful, no
University of Illinois U/C        |  accuser so terrible as the conscience
http://www.cen.uiuc.edu/~gkremese |  that dwells in the heart of every
spam_OUTgkremeseTakeThisOuTspamuiuc.edu                 |  man." - Polybius

1997\08\02@014429 by John Payson

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> Anyone ever do this?  A VERY SIMPLE GUI on an LCD with a 17C44?  I don't
> know where to begin; I'm just curious if it has been done with any degree
> of complexity.

Well, the first question I'd have would be what exactly you wish this
"gui" to do; the second question would be what type of display you'll be
using (dumb [you supply refresh and serial data in real-time], semi-smart
[screen will buffer pixel data but PIC must draw any lines, boxes,
characters, etc.], or smart [PIC simply gives the screen graphics commands
and the LCD controller does them].

If you are using a semi-smart or smart display and you can establish fixed
formats for all your windowing, a pseudo-GUI should not pose a problem.
If you wish to allow users to arbitrarily move and re-order windows, and
if partially-buried windows can be updated, then things are much more
difficult.

1997\08\02@065847 by Andrew Warren

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Garrick A Kremesec <Garrick A Kremesec <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>>
wrote:

> Anyone ever do .... A VERY SIMPLE GUI on an LCD with a 17C44?  I
> don't know where to begin; I'm just curious if it has been done
> with any degree of complexity.

Garrick:

Yeah, I've done a few... The best was on a text-only LCD, though,
and it used a 16C65 rather than a 17C44.

If you want to see it, call around to your local irrigation-supply
houses and find one who's an Altec or Solatrol dealer... The product
is a solar-powered commercial irrigation controller called the
"LEIT-4000".

Like the interface you're contemplating, mine was VERY simple... It
included radio buttons, checkboxes, sliders, and spin boxes, and
all user input came from a 4-button keypad (LEFT, RIGHT, YES/UP,
and NO/DOWN).  Essentially, it was just a a series of dialog boxes
through which the user navigated.

The "graphical" elements (open and closed radio buttons, open and
closed checkboxes, a bold "OK" and miscellaneous other bold
characters, double-headed vertical arrows, horizontal slider
components, etc... And versions of each of those with an underscore
cursor superimposed) were all created with custom characters
generated on-the-fly as they were needed.  The only tricky bit was
designing the screens so that no more than eight custom characters
(the LCD controller's limit) were ever displayed at any one time.

Are you planning to do yours with a text-only LCD, or a graphics LCD?
Using a graphic LCD is easier, but either way, it's important to
write very well-defined routines to handle the interface... If you
try to do each screen on an ad-hoc basis, you'll find that your code
quickly gets really big and REALLY unmanageable; it's much simpler to
spend the bulk of your time writing a really smart interface manager,
so you can easily define each screen with a minimum of code and be
sure that the interface will work no matter what those screens look
like,

-Andy

=== Andrew Warren - fastfwdspamKILLspamix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499

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