Graphic LCD support?

[srspinho]

Hi guys,

I have been talking to our friend pedja089 about the lib in the first lib.

I did some good improvements, and now, I can print strings and Variables correctly.

I have already started writing some basic graphic routines, and I would like to publish it here as a contribution if our friend pedja089 agree with it, and I think he will.

To test it I did a small simple digital clock, just to check if printing is working.

The code compiles ok when I use a 18F4550 as a target controller. The hex's size is about 4500 bytes.

But, when I change to the 16F877, (which has 8kb available) it always show me the following erros :

Message[303] c:\teste_~1\glcd_p~1.asm 207 : Program word too large.Truncated to core size. (6573)
Message[303] c:\teste_~1\glcd_p~1.asm 207 : Program word too large.Truncated to core size. (7420)
Message[303] c:\teste_~1\glcd_p~1.asm 207 : Program word too large.Truncated to core size. (436C)
Message[303] c:\teste_~1\glcd_p~1.asm 207 : Program word too large.Truncated to core size. (6F63)
Message[303] c:\teste_~1\glcd_p~1.asm 207 : Program word too large.Truncated to core size. (6800)
Message[303] c:\teste_~1\glcd_p~1.asm 207 : Program word too large.Truncated to core size. (7820)

The line 207 in the Asm code is :

data Str, 0

from the macro :

PrintStr macro x, y, Str
local TheString, OverStr
goto OverStr
TheString
data Str, 0
OverStr
MOVE?CB x, _GLCD_X
MOVE?CB x, _GLCD_SX
MOVE?CB y, _PosY
MOVE?CW TheString, _GLCD_Addr
L?CALL _GLCD_StringOut
endm

I admit that I am absolutely noob on writing/uderstanding assembler.

Does some one have any ideao of what is wrong with this Macro.

Is this restricted to 18F series ?

Thank you !

regards,

Sérgio

[mister_e]

Yup 18F don't work the same way for embedded strings. You may want to have a look at least at the following.

http://www.pbpgroup.com/modules/wfse...p?articleid=10

Notice the use of da vs Data and how to retrieve them.

You could also have a look at my NOKIA driver/wrapper.
http://www.picbasic.co.uk/forum/show...?t=327&page=54

[srspinho]

Thank you Mister_e !


I will spend some time this weekend trying to make the Lib better.

I would like to make it work with 16F series (877 and above) and 18F and make it public.

There are a lot of nice and cheap KS0108 for sale on eBay. I bought some from the seller Wide Hk and they are small and nice. Perfect for embeded solutions.

Well, let´s study the posts and try to fix it !

regards,

Sérgio

[muddy0409]

I know there are heaps of different GLCD controller types around, but surely the gurus at MELabs could toss a coin and pick one that they consider to be the most popular (KS0108?) and do some GLCDOUT type stuff for that controller? After all, they did exactly that when they selected the Hitachi 447?? (whatever) controller they wrote the LCDOUT stuff for? That has proven quite usable?
My 2 cents worth, but I won't hold my breath.

[Ioannis]

Or a couple of different libraries to cover a few flavors of GLCDs. Like other compilers do.

Ioannis

[HenrikOlsson]

Sure, if they did it I wouldn't protest against it.
But, as you say, there are plenty of graphic LCD controllers but basically only ONE standard for characters based displays and that IS the HD44780 (or compatibles). It's also a lot easier to drive than the graphical controllers, trust me I've tried with the RA6963C and the SSD1307. One issue is that the HD44780 basically just works and doesn't care about the number of characters per line etc, it doesn't care about the size (appart from number of lines) of the panel it's actually driving. But the graphical controllers are usually quite flexible when it comes to resolution of the panel and needs to be configured properly (not to mention timings, multiplex ratios etc etc.

My experience with MeLabs is that what they do they do properly and to do a general purpose GLCD driver to their standars is a LOT of work.

I wonder what they ARE working on at MELABS HQ nowadays, there's been no updates to compiler for 18 months. Darrels recent and unfortunate passing must have put a real dent in available resources

/Henrik.