Re: [Lcd4linux-devel] display on WRAP-Board - how fast is i2c? ho w good is the lpc connector?

[Luis.F.Correia <Lui...@se...>]

Hi!

> -----Original Message-----
> From: Stefan Krister [mailto:ste...@cr...] 
> Sent: Monday, July 10, 2006 10:52 AM
> To: lcd...@li...
> Subject: Re: [Lcd4linux-devel] display on WRAP-Board - how 
> fast is i2c? ho w good is the lpc connector?
> 
> 
> Hi Luis,
> 
> > This affirmation was done my heart, as I don't have the breadboard 
> > assembly with me right now. But can confirm later on today.
> 
> may I ask you for a circuit-schematic?

Well, i don't have then done with any schematic software...

Will you accept a hand drawn one?

> > Of course other display controllers could be supported, 
> provided that 
> > someone writes the driver code :P
> 
> Sure. I know that I have to do it. 3 weeks ago I started to 
> write a wrapd witch is able to light the WRAP-LEDs and reacts 
> on pressing the WRAP-push-button. Bevore that, I havn't 
> written any line of c-code for 10 or 15 years.

I have written a device driver for it, and is included in our
small router distribution, Bering uClibc.

Maybe we could combine efforts to produce a much better one.

http://leaf.cvs.sourceforge.net/leaf/src/bering-uclibc/apps/wrap1c/

It exposes the LED's and the button in a /proc interface

> 
> It was pretty hard to learn that stuff again ... but now it's 
> included into fli4l as wrap-addon. If you like, get the 
> source from the .zip here:
> http://extern.fli4l.de/fli4l_opt-db3/search.pl?pid=433
> 
> > The +5v line in the WRAP board is almost unuseable, 
> speccially if you 
> > use a miniPCI card that draws some power from it.
> 
> Yes, i totally agree.
> 
> > I also had some thoughts on using the GPIO pins, but found 
> it way too 
> > tricky to be done correclty (at least from me).
> 
> ;-))
> 
> I'll see, what I get during programming ... I hope, my 
> coworkers at fli4l will help me on that.
> 
> Do you know how many milliamps are allowed to get out of the 
> GPIO-header?

Not many, but probably not enough to drive a LCD controller...

Ask Pascal Dornier, the engineer of the WRAP boards, he is quite
responsive to direct hw queries.

> 
> Meanwhile, I started a wiki-page at
> http://wiki.port23.de/index.php?title=LC-Display_f%C3%BCr_das_WRAP
> 
> I collect all the stuff here.

It's in German... i can only read 2% of what's written there :(


Luis Correia   
Bering uClibc Team Member

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