sane-project-website/old-archive/1997-12/0127.html

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<!-- subject="Mustek-0.68: 600 II N patch" -->
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<title>sane-devel: Mustek-0.68: 600 II N patch</title>
<h1>Mustek-0.68: 600 II N patch</h1>
<b>Andreas Czechanowski</b> (<a href="mailto:andreas@inspc44c.ins.uni-stuttgart.de"><i>andreas@inspc44c.ins.uni-stuttgart.de</i></a>)<br>
<i>Tue, 23 Dec 1997 20:30:09 +0100 (MET)</i>
<p>
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Hi !<br>
<p>
Here is a patch for the 600 II N part of the SANE backend.<br>
It fixes :<br>
  - gamma correction is now possible<br>
  - lineart mode now produces more than an all-white image<br>
<p>
Below is some general information about configuring SANE for use<br>
with the Mustek Paragon 600 II N.<br>
<p>
This scanner is not accessed as SCSI device, and does not have a<br>
special device file in /dev assigned to it. The fontends access the<br>
I/O ports directly. This can either be done through /dev/port<br>
(may be too slow for some computers), or by running the frontend<br>
programs (e.g. scanimage, xscanimage) as root or SUID root.<br>
<p>
The AB 306 N interface supplied with the scanner can be configured to<br>
use one of eight I/O address ranges. Each range includes 3 consecutive<br>
I/O addresses (base+0 to base+2). Choose one of the addresses shown<br>
below, depending on your hardware (I hope you know what addresses are<br>
already in use !) :<br>
<p>
  0x26b          <br>
  0x2ab          <br>
  0x2eb          <br>
  0x22b        <br>
  0x32b          <br>
  0x36b          <br>
  0x3ab          <br>
  0x3eb       <br>
<p>
Instead of "/dev/scanner" or the like, make an entry with the address<br>
(in hexadecimal notation as shown above) on a line by itself into<br>
the configuration file mustek.conf . The 600 II N also requires<br>
<p>
  option line_distance_fix<br>
<p>
for proper scanning of color images. You may, before starting one<br>
of the frontends, enter<br>
<p>
  export SANE_DEBUG_MUSTEK=2<br>
<p>
(or something equivalent for csh), so that you get some debugging<br>
information on stderr. I would like to know what firmware revisions<br>
are out there (this is reported during inquiry by the scanner).<br>
<p>
Now, here's the patch:<br>
<p>
*** ./backend/mustek.c.orig	Wed Dec  3 07:49:10 1997<br>
--- ./backend/mustek.c	Sun Dec 14 16:11:24 1997<br>
***************<br>
*** 895,900 ****<br>
--- 895,928 ----<br>
    int i, j, table = 0, len, num_channels = 1;<br>
    u_int8_t gamma[3*256+10], val, *cp;<br>
  <br>
+   /* sigh! - the 600 II N needs a (dummy) table download even for<br>
+      lineart and halftone mode, else it produces a completely<br>
+      white image. Thank Mustek for their buggy firmware ! */<br>
+   if ((s-&gt;hw-&gt;flags &amp; MUSTEK_FLAG_PP)<br>
+       &amp;&amp; !(s-&gt;mode &amp; MUSTEK_MODE_MULTIBIT))<br>
+     {<br>
+       memset (gamma, 0, sizeof (gamma));<br>
+       gamma[0] = MUSTEK_SCSI_LOOKUP_TABLE;<br>
+ #if 1<br>
+       gamma[2] = 0x0;		/* indicate any preloaded gamma table */<br>
+       DBG(3, "gamma_correction: sending dummy gamma table select\n");<br>
+       return dev_cmd (s, gamma, 6, 0, 0);<br>
+ #else<br>
+       /* try to send a custom gamma table, because brightness and<br>
+ 	 contrast adjustment don't change anything in the single-bit-modes<br>
+ 	 with the 600 II N. - does not work either :-( */<br>
+       gamma[2] = 0x27;		/* indicate any preloaded gamma table */<br>
+       cp = gamma + 10;<br>
+       for (j = 0; j &lt; num_channels; ++j, ++table)<br>
+ 	for (i = 0; i &lt; 256; ++i)<br>
+ 	  {<br>
+ 	    *cp++ = (i &gt; (128 + s-&gt;val[OPT_BRIGHTNESS].w) ? 255 : 0);<br>
+ 	  }<br>
+       DBG(3, "gamma_correction: sending gamma table of %d bytes\n", len);<br>
+       return dev_cmd (s, gamma, 10 + 3*256, 0, 0);<br>
+ #endif<br>
+     }<br>
+ <br>
    if (!s-&gt;val[OPT_CUSTOM_GAMMA].w<br>
<i>        || !(s-&gt;mode &amp; MUSTEK_MODE_MULTIBIT))</i><br>
      return SANE_STATUS_GOOD;<br>
*** ./sanei/sanei_ab306.c.orig	Wed Nov 26 07:15:29 1997<br>
--- ./sanei/sanei_ab306.c	Sat Dec 13 14:57:50 1997<br>
***************<br>
*** 374,380 ****<br>
        break;<br>
      }<br>
  <br>
!   status = ab306_write (p, src, cdb_size);<br>
    if (status != SANE_STATUS_GOOD)<br>
      return status;<br>
  <br>
--- 374,380 ----<br>
        break;<br>
      }<br>
  <br>
!   status = ab306_write (p, src, 6 /* cdb_size */);<br>
    if (status != SANE_STATUS_GOOD)<br>
      return status;<br>
  <br>
<pre>
---
<p>
Regards,
<p>
Andreas.
<p>
<p>
<p>
<pre>
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</pre>
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