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<TITLE>sane-devel: Re: weird speed difference with parallel port scann</TITLE>
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<META NAME="Author" CONTENT="mh (moloch@nikocity.de)">
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<META NAME="Subject" CONTENT="Re: weird speed difference with parallel port scanner">
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<H1>Re: weird speed difference with parallel port scanner</H1>
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<!-- received="Sun Aug 13 10:30:01 2000" -->
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<!-- sent="Sun, 13 Aug 2000 17:55:48 +0200" -->
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<!-- name="mh" -->
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<!-- email="moloch@nikocity.de" -->
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<!-- subject="Re: weird speed difference with parallel port scanner" -->
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<!-- id="00081319220600.00341@slowcrap" -->
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<STRONG>From:</STRONG> mh (<A HREF="mailto:moloch@nikocity.de?Subject=Re:%20weird%20speed%20difference%20with%20parallel%20port%20scanner&In-Reply-To=<00081319220600.00341@slowcrap>"><EM>moloch@nikocity.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Aug 13 2000 - 08:55:48 PDT
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<P>
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"G. Jaeger, Son, 13 Aug 2000 ":
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<BR>
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<EM>> Hi Michael,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I currently can't figure out, why the detection
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</EM><BR>
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<EM>> of EPP should be other with or without printer!
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> The driver gets this information out of the
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</EM><BR>
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<EM>> parport driver, so I think the problem is inside
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</EM><BR>
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<EM>> this one...
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Anyway, I'll try to get the same configuration and test it..
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Gerhard
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</EM><BR>
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Hi Gerhard,
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<BR>
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I think you're right - this seems to be a problem in the parport driver :-(
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<BR>
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This is the debug output with a standalone scanner connected
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<BR>
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to the parport; the port mode *is* set to EPP in the BIOS.
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<BR>
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<P>Requested port at 0x378
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<BR>
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Requested port (0x378) found
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<BR>
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Port mode reported: (0x0001)
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<BR>
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Port registered
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<BR>
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ptdrvOpen(port=0x378)
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<BR>
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Try to claim the parport
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<BR>
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Using SPP-mode
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<BR>
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<P>Yesterday I made some hacks in your driver. I changed the function
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<BR>
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"miscSetPortMode(pScanData ps)" in "misc.c" the way the use of
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<BR>
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EPP mode is forced by adding the line
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<BR>
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<P> port_feature = PARPORT_MODE_PCEPP;
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<BR>
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right after the line
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<BR>
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port_feature = initPortProbe( ps );
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<BR>
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<P>As you can see, the reported port mode is still
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<BR>
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0x0001 (= PARPORT_MODE_PCSPP). The
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<BR>
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plustek driver /scanner however works without problems in EPP mode.
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<BR>
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(==normal speed)
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<BR>
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<P>Requested port at 0x378
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<BR>
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Requested port (0x378) found
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<BR>
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Port mode reported: (0x0001)
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<BR>
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Port registered
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<BR>
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ptdrvOpen(port=0x378)
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<BR>
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Try to claim the parport
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<BR>
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Using EPP-mode
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<BR>
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<P>Hmm, IIRC there was an option in previous versions of
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<BR>
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the plustek driver that allowed one to set the port mode manually?
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<BR>
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<P>But I think, this is quite OT for sane-devel now. (Maybe I should give the
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<BR>
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people on parport-devel the needle with this question).
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<BR>
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For the moment the hack works for me, and since it seems I'm the only one with
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<BR>
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this problem, there probably isn't a need for further investigation.
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<BR>
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On the other hand, if you can figure out what the real problem is, I would be
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<BR>
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glad to hear about it!
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<BR>
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<P>Thanks a lot and happy driver hacking
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<BR>
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Michael
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<BR>
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<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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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sun Aug 13 2000 - 10:31:15 PDT</EM>
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