Re: [Lcd-linux] state of this project / effort to get into mainline linux

[Mattia Jona-L. <mat...@gm...>]

Hi,

finally the project never went into the mainline kernel and lived
parallel but outside the kernel sources.

The project is not dead and chances are that the last release of
LCD-Linux still compiles and works with a recent kernel with little or
no modification.
The project is however old and technologically outdated. Parallel
ports are no longer available on modern computers and one would have
at least to adapt the code dealing with the parallel port to the GPIO
interface, which is doable and not difficult. Also, the idea of
LCD-Linux was to write an optimized driver for alphanumeric displays
including terminal emulation. Only the HD44780 driver was written and
developed but other drivers could be developed with little effort
because basically you only need to write the elementary functions of
how to write a single character on the particular display and how to
open the communication channel between computer and display. The
problem of what to display where has already been solved once and for
all.

To my knowledge there is no modern replacement of LCD-Linux. LCDproc
is a userspace program that gathers information from the system and
displays it on an LCD. It supports lots of displays but as far as I
know there is no simple way to make it display some user generated
input. Another program is LCD4Linux, which by the way supports
LCD-Linux among the possible connection types, which features a sort
of LCD-Linux emulation since one can open a FIFO special file and
everything written on the FIFO is output on the LCD. Still no terminal
emulation though.

LCDProc should still be alive. The status of LCD4Linux is unknown to me.

Try to identify the controller of your display and find the
correspondent datasheet. Then you can decide whether lcd-linux suits
your needs.

Best,

Mattia




On Tue, Oct 7, 2014 at 4:33 PM,  <ha...@cc...> wrote:
> Hi,
>
> I see that about 4 years ago there was a effort to get lcd-linux into
> the mainline kernel. What became of this?
>
> Is this project still alive and useful or has it been obsoleted by
> something new?
>
> My reason for looking into lcd-linux is that I want to write a driver
> for a 1x9 14-segment display, but am unsure where such a driver belongs.
>
> Do you have any advice about handling alphanumeric lcd displays from
> linux?
>
> TIA,
> Harald
>
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