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<TITLE>sane-devel: Re: Problems with Acer ScanPrisa 640S</TITLE>
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<META NAME="Author" CONTENT="Sebastien Sable (sebastien.sable@gmx.net)">
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<META NAME="Subject" CONTENT="Re: Problems with Acer ScanPrisa 640S">
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<H1>Re: Problems with Acer ScanPrisa 640S</H1>
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<!-- received="Fri Oct 20 17:44:00 2000" -->
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<!-- name="Sebastien Sable" -->
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<!-- email="sebastien.sable@gmx.net" -->
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<!-- subject="Re: Problems with Acer ScanPrisa 640S" -->
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<!-- id="87zojznhei.fsf@gmx.net" -->
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<!-- inreplyto="Fri, 20 Oct 2000 11:10:45 +0800"" -->
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<STRONG>From:</STRONG> Sebastien Sable (<A HREF="mailto:sebastien.sable@gmx.net?Subject=Re:%20Problems%20with%20Acer%20ScanPrisa%20640S&In-Reply-To=<87zojznhei.fsf@gmx.net>"><EM>sebastien.sable@gmx.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Oct 20 2000 - 17:53:57 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0236.html">Chris Bagwell: "[snapscan] Small USB+misc patch for sane-1.0.3"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0234.html">Jochen Eisinger: "Re: make dll.c robust against it being listed in its configuration file..."</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0237.html">Lawrence Glaister: "Re: Problems with Acer ScanPrisa 640S"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0219.html">cbagwell@sprynet.com: "Re: Re: Problems with Acer ScanPrisa 640S"</A>
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<LI><STRONG>Maybe reply:</STRONG> <A HREF="0219.html">cbagwell@sprynet.com: "Re: Re: Problems with Acer ScanPrisa 640S"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0237.html">Lawrence Glaister: "Re: Problems with Acer ScanPrisa 640S"</A>
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Steve Underwood <<A HREF="mailto:steveu@coppice.org?Subject=Re:%20Problems%20with%20Acer%20ScanPrisa%20640S&In-Reply-To=<87zojznhei.fsf@gmx.net>">steveu@coppice.org</A>> writes:
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<BR>
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<P><EM>> I updated the backend to merge the colours properly in May. Since then I have had
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</EM><BR>
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<EM>> little feedback. Lawrence is the first person to fully work through anything from
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</EM><BR>
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<EM>> "I have a problem" to "I have a cure" since then. People need some serious coaxing
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</EM><BR>
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<P>This time I think "I have a cure" ;)
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<BR>
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<P>I found that ps->pss->expected_read_bytes calculated in SCSISource_get
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<BR>
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was slowly decreasing down to 0. At this point
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<BR>
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(ps->pss->expected_read_bytes == 0) the scanner would block.
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<BR>
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<P>To solve this, I can put it to an arbitrary high value.
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<BR>
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<P>// ps->pss->expected_read_bytes =
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<BR>
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// ((int) (msecs/ps->pss->ms_per_line))*ps->pss->bytes_per_line;
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<BR>
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<P> ps->pss->expected_read_bytes = 50000;
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<BR>
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<P>then this line later
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<BR>
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ps->pss->expected_read_bytes = MIN(ps->pss->expected_read_bytes,
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<BR>
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(size_t) ps->absolute_max);
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<BR>
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put it to absolute_max.
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<BR>
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<P>In this case, my scanner works fine and does not block anymore. Of
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<BR>
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course, it's a dirty trick.
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<BR>
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May be the ms_per_line reported by the scanner is not right or
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<BR>
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something?
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<BR>
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<P><PRE>
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--
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S<EFBFBD>bastien Sabl<62>
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<A HREF="mailto:sebastien.sable@gmx.net?Subject=Re:%20Problems%20with%20Acer%20ScanPrisa%20640S&In-Reply-To=<87zojznhei.fsf@gmx.net>">sebastien.sable@gmx.net</A>
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<P>--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Problems%20with%20Acer%20ScanPrisa%20640S&In-Reply-To=<87zojznhei.fsf@gmx.net>">majordomo@mostang.com</A>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0236.html">Chris Bagwell: "[snapscan] Small USB+misc patch for sane-1.0.3"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0234.html">Jochen Eisinger: "Re: make dll.c robust against it being listed in its configuration file..."</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0237.html">Lawrence Glaister: "Re: Problems with Acer ScanPrisa 640S"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0219.html">cbagwell@sprynet.com: "Re: Re: Problems with Acer ScanPrisa 640S"</A>
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<LI><STRONG>Maybe reply:</STRONG> <A HREF="0219.html">cbagwell@sprynet.com: "Re: Re: Problems with Acer ScanPrisa 640S"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0237.html">Lawrence Glaister: "Re: Problems with Acer ScanPrisa 640S"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Fri Oct 20 2000 - 17:45:21 PDT</EM>
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