[BRLTTY] Support for 'dead' or broken cells?

[Erik Heil]

Hi.
Not sure if barious Braille displays actually support this, but if they do
have a mechanism for tetecting dead/broken cells, perhaps brltty could use
this.  Something like   when thdsmart subsystem dtermines that some
sectors are bad and need to be taken out of service on storage media.
IMHO though, another way to eal with this is to have the user be prompted
for inical setup.  For those that have cursor routing buttons above each
cell, their could be a test that simply presents the eight dots on the
cell. The use could then be prompted to confirm that the cell is ineed not
functioning properly.  That way, Brltty could built up an internal table
of cells that are taken out of service.   Should the cells at one point be
repaired, the use could then reinicialize the table of values.

On Wed, 28 Mar 2007 yan at mistigri.org wrote:

> Date: Wed, 28 Mar 2007 10:25:07 +0200
> From: yan at mistigri.org
> Reply-To: Informal discussion between users and developers of BRLTTY.
>     <brltty at mielke.cc>
> To: Informal discussion between users and developers of BRLTTY.
>     <brltty at mielke.cc>
> Subject: Re: [BRLTTY] Support for 'dead' or broken cells?
>
> Hi:
> > Hi All:
> >
> > At CSUN, the LSR folks showed an interesting feature to provide support
> > for filtering out broken or dead cells on the display.  This seems like
> > a feature that should live in BrlTTY, since it could take advantage of
> > such things when presenting information for virtual consoles.  I think
> > the basic idea would be to just treat the cell as if it weren't even
> > part of the display.
> >
> > Would being able to keep/use a record of broken/dead cells be possible
> > to do in BrlTTY?
> Yes this could be an interresting feature:
> In the core we could make a difference bitween the 'real length ' of the
> display and the 'actually used length'.
> Moreover we would have to implement something like a table refering to
> cells that are 'down' or 'not working'..
> For example wlets take a 20 length display content :
> [abcdefghijklmnopqrst]
>
> And lets suppose the 5th cell no longeer works, we would arrange the
> message like this :
> [abcd efghijklmnopqrs]
>
> Here the 5th cell is dead so we put a space (0x00 dot-pattern), and
> right-shift the end of our message content: so here, the actual
> display-length would be 19 cells.
>
> Is that what you would like ?
>
> Yannick
> >
> > Will
> >
> > _______________________________________________
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> > For general information, go to: http://mielke.cc/mailman/listinfo/brltty
>
> --
> Yannick PLASSIARD
> yan at mistigri.org
> www.mistigri.org
>
> _______________________________________________
> This message was sent via the BRLTTY mailing list.
> To post a message, send an e-mail to: BRLTTY at mielke.cc
> For general information, go to: http://mielke.cc/mailman/listinfo/brltty
>

eheil at sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org