Re: [Lcd4linux-devel] USB based LCD

[Michael R. <mi...@re...>]

Hi Tomasz,

> For the sake of manufacturing simplicity and cost efficiency, we are using a fixed function USB interface chip, whose
> GPIO lines are used to toggle HD44780-compatible LCDs. Thus, we want to go down the route of implementing a libusb
> based control software, that would use USB interrupts to send control commands to the LCD.

> As advised in the http://ssl.bulix.org/projects/lcd4linux/wiki/driver_howto, I'm posting on this list in hopes of
> finding some clues (beyond reading drv_USBLCD.c) on what we need to be on the lookout for.

I'm afraid I can't help you with electronics design, but as there's more than one driver for USB-based HD44780 displays, 
you probably want to read several different drivers...

 From my (lcd4linux-focused) point of view, I prefer "dumb" displays that doesnt have to much intelligence built in, but 
provide a more or less "raw" HD44780 interface on USB.

MatrixOrbital and Crystalfontz for example are "intelligent" displays, writing a driver may be much more complicated 
than LCD2USB (wich is a very simple and very clean design).



Regards, Michael

-- 
Michael Reinelt <mi...@re...>
http://home.pages.at/reinelt
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