sane-project-website/old-archive/1998-01/0055.html

<!-- received="Wed Jan 14 15:16:38 1998 PST" -->
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<!-- name="Henning Meier-Geinitz" -->
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<!-- subject="Re: Problems with Mustek 600 II N" -->
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<title>sane-devel: Re: Problems with Mustek 600 II N</title>
<h1>Re: Problems with Mustek 600 II N</h1>
<b>Henning Meier-Geinitz</b> (<a href="mailto:st002354@hrz1.hrz.tu-darmstadt.de"><i>st002354@hrz1.hrz.tu-darmstadt.de</i></a>)<br>
<i>Wed, 14 Jan 1998 22:54:01 +0100</i>
<p>
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Hi!<br>
 <br>
<i>&gt; &gt; I tried to do some debugging and set SANE_DEBUG_SANEI_AB306. If I use</i><br>
<i>&gt; &gt; a value of 4 or higher I can use the scanner, if its 3 or lower, the</i><br>
<i>&gt; &gt; driver hangs. Some Output with SANE_DEBUG_SANEI_AB306=3:</i><br>
<i>&gt; </i><br>
<i>&gt; Really loks like a timing problem ! Have you tried to use xscanimage</i><br>
<i>&gt; as "normal" user ? If you do so, make sure to make /dev/port accessable</i><br>
<i>&gt; for read and write to the user.</i><br>
<p>
Yes, I tried this now, and it works without these problems. But with<br>
/dev/port enabled, the scanner isn't turned off after leaving<br>
xscanimage any more.<br>
<p>
<i>&gt; Background: I/O via /dev/port is very much slower than by direct</i><br>
<i>&gt; inb/outb assembler inline instructions (but these can only be used</i><br>
<i>&gt; if the program is executed by root or is run with the SUID bit set).</i><br>
<p>
I tried another one: I put a usleep in sanei_ab306.c:<br>
<p>
<p>
 /* Send a single command-byte over the AB306N-interface.  */<br>
static void<br>
ab306_cout (Port *p, int val)<br>
{<br>
  u_long base = p-&gt;base;<br>
<p>
  usleep(100); /* &lt;---------- */<br>
  while ((ab306_inb (p, base + 1) &amp; 0x80));     /* wait for dir flag */<br>
  ab306_outb (p, base, val);<br>
  ab306_outb (p, base + 1, 0xe0);<br>
  while ((ab306_inb (p, base + 1) &amp; 0x80) == 0);        /* wait for ack */<br>
  ab306_outb (p, base + 1, 0x60);<br>
}<br>
<p>
This works for me (without the SANE_DEBUG trick), but I don't know<br>
much about programming and C.<br>
<p>
Two other points:<br>
If I press "Cancel" during the scan, xscanimage hangs for about 2<br>
minutes before it is working again. <br>
<p>
Color doesn't work for me. The colors seem to overlap some milimeters<br>
if I use 150 dpi. If I use other resolutions I will get horizontal<br>
lines and "ugly" colors. Without the line-distance-fix it's even uglier.<br>
<p>
<i>&gt; I'll have a look at it as I have the time. </i><br>
<p>
Thank you very much. If I can help you (do testing ...), please mail<br>
me.<br>
<p>
Ciao, Henning<br>
<p>
<pre>
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<ul>
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<li> <b>Next message:</b> <a href="0056.html">becka@rz.uni-duesseldorf.de: "Re: Probable Bugs &amp; Suggestions"</a>
<li> <b>Previous message:</b> <a href="0054.html">Gareth J. Greenaway: "Parallel Support?"</a>
<li> <b>In reply to:</b> <a href="0052.html">Andreas Czechanowski: "Re: Problems with Mustek 600 II N"</a>
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