Re: [Hp3300backend-devel] update

[Bertrik S. <be...@zo...>]

Hi people,

Here's what happened since my last e-mail to this list.

Bertrik Sikken wrote:
> First, as many of you probably already know, there appear to me more
> than just two niash chips (the niash00014 for the hp3300c and the
> niash00019 for the hp3400c/4300c). I've had reports of hp3300c
> scanners with niash00012 and niash00013 chips. Apparently the
> hp5400 is even using a niash00033.
> In the past, support for these different chips has been added as
> lots of little kludges, mostly on how to initialise the chip
> before starting to read the image data. My plan is now to
> separate the specifics for each chipset in a separate function
> (perhaps even a separate file) for each. This should make it easier
> to make changes / add features / fix bugs for a specific chip,
> without breaking the code for the other chips.

The code is now a little bit more organised now, by separating out
the niash00019 specific code. I tried to avoid duplicating code.
It's in CVS. If there are no major bugs, I think I'll make another
release soon.

During the process of reorganising I found out some new stuff about
the register that determines how much data is allowed to be stored
in the scanner's internal buffer (too little means a lot of
backtracking, too much results in sideways shifted images).
This new knowledge is now also in the sources in CVS. It affects
only HP3300c scanners.

For the HP3400/4300 scanners I added some experimental code that
should make it possible to also scan at 150 and 600 dpi.
It uses a trick with a register that makes the scanner skip every
other line, pointed out by Lev Shamardin.
I have not been able to test this (I don't have such a scanner).

Finally you may have noticed that sane 1.0.8 was just released
this week. Fortunately Ricardo Martin's patch-sane.sh script
still does its magic.

All the best,
Bertrik