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<TITLE>sane-devel: Re: microtek2 and scsi_read_image_status</TITLE>
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<META NAME="Author" CONTENT="Karsten Festag (karsten.festag@t-online.de)">
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<META NAME="Subject" CONTENT="Re: microtek2 and scsi_read_image_status">
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<H1>Re: microtek2 and scsi_read_image_status</H1>
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<!-- received="Mon Mar 19 12:29:35 2001" -->
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<!-- isoreceived="20010319202935" -->
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<!-- sent="Mon, 19 Mar 2001 21:12:01 +0100" -->
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<!-- isosent="20010319201201" -->
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<!-- name="Karsten Festag" -->
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<!-- email="karsten.festag@t-online.de" -->
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<!-- subject="Re: microtek2 and scsi_read_image_status" -->
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<!-- id="3AB66811.9B9B3B0B@t-online.de" -->
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<!-- inreplyto="m21ys4b36n.fsf@boreas.yi.org." -->
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<STRONG>From:</STRONG> Karsten Festag (<A HREF="mailto:karsten.festag@t-online.de?Subject=Re:%20microtek2%20and%20scsi_read_image_status&In-Reply-To=<3AB66811.9B9B3B0B@t-online.de>"><EM>karsten.festag@t-online.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Mar 19 2001 - 12:12:01 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0154.html">Karsten Festag: "Re: Microtek Phantom 330CX"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0152.html">Sebastien Sable: "[snapscan] new version snapscan-20010319 of the backend"</A>
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<P>
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Hi John,
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<BR>
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<P>sorry, I couln't respond because I was on holidays. I can speak for the
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<BR>
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Phantom 330 / 336 CX scanner, which I am currently working on (with some
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<BR>
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success in the meanwhile). At least the 330CX really needs the READ IMAGE
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<BR>
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STATUS command, otherwise it shows unpredictable behaviour. In the
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<BR>
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documentation is mentioned that the scanner goes into calibration after
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<BR>
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this command. And my backend has to query the scanner a few times before
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<BR>
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it is ready. So I think we cannot remove the command.
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<BR>
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<P>by the way, which SCSI-command-documentation do you have? The newest I
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<BR>
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could find on the Microtek ftp site was Rev. 2.2.4 from August 1997. Do
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<BR>
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you have a newer one?
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<BR>
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<P>Greetings
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<BR>
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<P>Karsten
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<BR>
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<P><P><P>John Fremlin wrote:
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<BR>
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<P><EM>> SANE committers please pay attention!
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> As far as I can see no one has replied to my original mail. I am
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</EM><BR>
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<EM>> therefore compelled to do so myself ;-)
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> John Fremlin <<A HREF="mailto:chief@bandits.org?Subject=Re:%20microtek2%20and%20scsi_read_image_status&In-Reply-To=<3AB66811.9B9B3B0B@t-online.de>">chief@bandits.org</A>> writes:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> > At the moment scsi_read_image_status sends a READ IMAGE STATUS with
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</EM><BR>
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<EM>> > a zero transfer length. This wedges my Microtek X6 USB scanner so
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</EM><BR>
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<EM>> > completely it won't even respond to USB resets.
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > One workaround would be to just not do READ IMAGE STATUS. This is bad
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</EM><BR>
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<EM>> > because we wouldn't be able to tell if the scanner is ready to scan.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Background information: The READ IMAGE STATUS command is used to see
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</EM><BR>
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<EM>> if the scanner is ready to scan. In the Microtek SCSI command set
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</EM><BR>
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<EM>> documentation it says that it should always be used before performing
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</EM><BR>
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<EM>> a scan.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> However, it wedges my scanner unless a rather hideous workaround is
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</EM><BR>
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<EM>> put in place. Nobody else has tested this hideous workaround on their
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</EM><BR>
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<EM>> scanner, as far as I can tell so the hideous workaround could quite
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</EM><BR>
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<EM>> possibly fail to work on other peoples' scanners.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Because SANE opens the SCSI device with O_EXCL it is impossible for
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</EM><BR>
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<EM>> two scans to proceed at once. Even when running scanimage twice
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</EM><BR>
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<EM>> without pause, when READ IMAGE STATUS is called the scanner is always
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</EM><BR>
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<EM>> already ready to scan, as far as I could see from the logs.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I propose that the READ IMAGE STATUS call be removed from microtek2.c
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</EM><BR>
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<EM>> because it is untested functionality that causes problems for some
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</EM><BR>
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<EM>> people.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> [...]
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> --
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> <A HREF="http://www.penguinpowered.com/~vii">http://www.penguinpowered.com/~vii</A>
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</EM><BR>
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<P><P><P><P><PRE>
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--
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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:%20microtek2%20and%20scsi_read_image_status&In-Reply-To=<3AB66811.9B9B3B0B@t-online.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0154.html">Karsten Festag: "Re: Microtek Phantom 330CX"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0152.html">Sebastien Sable: "[snapscan] new version snapscan-20010319 of the backend"</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>Mon Mar 19 2001 - 12:31:28 PST</EM>
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