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<TITLE>sane-devel: Re: Mustek/LifeTec/Medion parport CIS driver</TITLE>
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<META NAME="Author" CONTENT="Jochen Eisinger (jochen.eisinger@gno.de)">
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<META NAME="Subject" CONTENT="Re: Mustek/LifeTec/Medion parport CIS driver">
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<H1>Re: Mustek/LifeTec/Medion parport CIS driver</H1>
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<!-- received="Mon Oct 16 02:11:06 2000" -->
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<!-- name="Jochen Eisinger" -->
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<!-- subject="Re: Mustek/LifeTec/Medion parport CIS driver" -->
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<STRONG>From:</STRONG> Jochen Eisinger (<A HREF="mailto:jochen.eisinger@gno.de?Subject=Re:%20Mustek/LifeTec/Medion%20parport%20CIS%20driver&In-Reply-To=<39EAC809.5B269395@gno.de>"><EM>jochen.eisinger@gno.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Oct 16 2000 - 02:19:05 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0167.html">mh: "Problems with saned/net backend"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0165.html">Eddy De Greef: "Re: Mustek/LifeTec/Medion parport CIS driver"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0165.html">Eddy De Greef: "Re: Mustek/LifeTec/Medion parport CIS driver"</A>
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<P>
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Hi!
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<BR>
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<P>[Eddy De Greef]
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<BR>
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<EM>>
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</EM><BR>
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<EM>> The scanner seems to respond more or less correctly to the SANE driver,
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</EM><BR>
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<EM>> but the returned images were all white, so I concentrated on the
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</EM><BR>
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<EM>> read_line_101X function.
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</EM><BR>
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My experience is, there are 4 places, where the backend has to be
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<BR>
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patched to support a new scanner:
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<BR>
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<P>* config_ccd & functions called from there (I your case, you'll need a
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<BR>
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config_cis or something like this)
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<BR>
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* calibrate (each scanner has his own calibration)
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<BR>
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* wait_bank_change (waits until the scanner has the next scanline ready)
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<BR>
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* get_color_line (to cycle the channels in the right order)
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<BR>
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<P><P>Maybe this might help you. There seem to be "internal" registers in the
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<BR>
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scanner, which are accessed like this
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<BR>
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<P>sanei_pa4s2_writebyte (fd, 6, register_type << 4 + register_no);
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<BR>
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sanei_pa4s2_writebyte (fd, 5, register_value);
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<BR>
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sanei_pa4s2_writebyte (fd, 6, register_no);
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<BR>
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<P>hmm, at least I suspect this. I don't know which register does what, but
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<BR>
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this helps to analyse the output of the tools.
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<BR>
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<BR>
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<EM>> I didn't continue my experiments (it was getting late), but I looks like the
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</EM><BR>
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<EM>> problem might be the calibration of the scanner.
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</EM><BR>
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<EM>> >From what I understand from the code, the driver tries to find the black upper
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</EM><BR>
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<EM>> and left edge. However, I wonder whether there are really any black edges.
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</EM><BR>
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<EM>> >From the outside, it looks like the edges might as well be lightgray (the
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</EM><BR>
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<EM>> color of the plastic case). I'll open the case this evening to have a look at
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</EM><BR>
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<EM>> it. Moreover, the fact that the inside of the cover is black (all other
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</EM><BR>
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<EM>> scanners that I've seen have a white cover) makes me wonder whether looking
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</EM><BR>
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<EM>> for black edges is the right thing to do. Maybe a black cover is something
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</EM><BR>
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<EM>> specific for CIS-scanners ?
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</EM><BR>
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<P>The mustek scanners all have black covers... For calibration use there
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<BR>
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is a image in the case of the scanner, which looks like
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<BR>
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<P>|xxxx x |
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<BR>
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|xxxx x |
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<BR>
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<P>where the xxx area is black and the rest white. This picture is used to
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<BR>
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determine, what black & white should be and where the scanable area
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<BR>
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starts... at least it works this way with the 300 dpi scanners.
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<BR>
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<P>600 dpi scanners are able to use different bank sizes. If the
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<BR>
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(bank_counter & 1) & 1 is always zero, the scanner uses a 8K bank
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<BR>
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(usefull info to debug wait_bank_change :-)
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<BR>
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<P>happy hacking!
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<BR>
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<P>-- jochen
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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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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Mustek/LifeTec/Medion%20parport%20CIS%20driver&In-Reply-To=<39EAC809.5B269395@gno.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0165.html">Eddy De Greef: "Re: Mustek/LifeTec/Medion parport CIS driver"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Mon Oct 16 2000 - 02:11:33 PDT</EM>
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