RE: [hpoj-devel] patch to improve scan speed/robustness

[DG <dg...@um...>]

From: pa...@rc... (David Paschal)
>Attached is a patch to ieee12844pp.c (version 0.6) to enable bidirectional
>ECP (as opposed to the current slower ECP/forward and nibble/reverse).  In
>addition to speeding up scans by up to 4 times (according to my rough
>measurements), I'm hoping this will also fix the driver lockup problems
>that Daniel and possibly others have experienced.  I invite Daniel and
>anybody else who doesn't mind living a bit on the bleeding edge to try
>it out and report success or problems.  Note that it requires a
bidirectional (also known as "PS/2") or ECP parallel port.

David, you're my hero!!!  This patch works great!  With debug on or off, I
was able to pass the 'scanimage --test' test.  I used xscanimage stand-alone
and gimp plug-in and both worked great, even with 10MB scans.  It's much
faster than the old driver--and doesn't hang.  Way to go!

>There are two new module parameters with this patch: "usebecp" and
>"usenibble".

>"usebecp=1" is *required* for the OfficeJet G series, K series, LaserJet
>1100A and 3200; it should be omitted (or set to 0) for other models.

Is the PSC 500 an "other model?"

--
Daniel
ZZZ-dgun-ZZZ-@-ZZZ-umpire.com-ZZZ
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