Re: [lcd4linux] Chardriver for M50530 Displays

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

kifo schrieb:
> 
> I think a kernel module offering a chardevice is much more flexible,
> because it can be accessed by a simple perl- or shellscript. There is no
> need of big programs around. You simply write on the device to display.
> 
> Am Sam, 2002-03-16 um 19.30 schrieb Herbert Rosmanith:
> > > We developed a nice chardriver for M50530 controlled displays leaned on
> > > Michael McLellan's lcdmod (which is for HD44780). It is quite compatible
> >
> > just a question, but why would one want to have a kernel-module if one
> > can do it in user-space? or is there something particular about the
> > m50530?

I agree with both of you.

There are several reaons for and against a kernel module. Each approach
has is advantages and disadvantages.

We decided to do user-space programming with lcd4linux because of

- you'd need a kernel module for each display
- kernel modules must mach the running kernel (lcd4linux needs not)
- linux offers lots of low-level access methods to the parallel port
(the ppdev interface), so the display programming within lcd4linux is
quite "high-level"


bye, Michael

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