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<TITLE>sane-devel: Re: use of ioperm in sane</TITLE>
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<META NAME="Author" CONTENT="Tim Waugh (twaugh@redhat.com)">
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<H1>Re: use of ioperm in sane</H1>
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<STRONG>From:</STRONG> Tim Waugh (<A HREF="mailto:twaugh@redhat.com?Subject=Re:%20use%20of%20ioperm%20in%20sane&In-Reply-To=<20010212164155.O909@redhat.com>"><EM>twaugh@redhat.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Feb 12 2001 - 08:41:55 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0125.html">stef: "Re: use of ioperm in sane"</A>
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On Mon, Feb 12, 2001 at 05:37:52PM +0100, stef wrote:
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<P><EM>> As far I understood, ppdev relies on parport to read/write
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</EM><BR>
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<EM>> data, and when when I look into parport_pc.c, I saw that write/read
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</EM><BR>
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<EM>> data only uses inb/outb. I couldn't see any insl or insb that my
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<EM>> scanner uses heavily to increase transfer speed.
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</EM><BR>
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<P>The ppdev _interface_ has support for 32-bit EPP reads and writes (or
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<BR>
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it might possibly need a PPFLAG ioctl to set PARPORT_EPP_FAST). The
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implementation hasn't caught up with that yet, but that's a Small
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Matter of Programming.
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<P>But 32-bit writes or 8-bit writes is just a speed thing rather than
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something that makes it not work altogether, surely?
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<BR>
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<P>Tim.
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*/
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<LI>application/pgp-signature attachment: <A HREF="att-0124/01-part">stored</A>
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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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