Re: [lcd4linux] Powering the HD44780 from the Printer Port

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

Hi Mark,

> As far as I understand - it should be possible to power most displays
> from the power given by the LPT Printer port. I'm not referring to the
> back-light - just the display itself....
> 
> In order to do this - one would need to "Switch-On" one of the Control
> Output pins first - before trying to initialise the Display.
> 
> By using the "BACKLIGHT" wiring command - I can get power to the LCD -
> but this seems to happen AFTER the LCD has initialised.... which is then
> a bit late... - ie - The display stays blank.
> 
> Any chance of a modification that first Powers up (eg a Pin called
> "POWER") - and then sends all the initialisation stuff???
> 
> It should then be possible to then Power and Drive an LCD from only the
> Parallel port.  

Hey, great idea!

coded, checked int CVS, documented in the wiki (look for 'SIGNAL_POWER'
and 'T_POWER'.

who said there's slow development cycles with lcd4linux?


have fun, Michael

and, *please*, if it works, feel free to add/correct the wiki!

-- 
Michael Reinelt <re...@eu...>
http://home.pages.at/reinelt
GPG-Key 0xDF13BA50
ICQ #288386781