Re: [PARPORT] ECP speed using ppdev driver

From: Tim Waugh (
Date: Thu Feb 24 2000 - 03:29:45 EST

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    On Wed, 23 Feb 2000, Chandan Mishra wrote:

    > I am using ppdev driver for parallel port. I am trying to drive the
    > printer connected to my PC in ECP mode, but the throughput which I am
    > getting is very poor, some thing in order of 100,000 bytes per second.
    > If I go through the code I see a delay of 5 microsecond used in
    > hardcoded fashion in ppdev.c while writing the data in ecp mode. Can
    > anyone help me with availability of any other existing ECP mode driver
    > for parallel port.

    The ppdev patch for 2.2.x doesn't do transfers in hardware-assisted modes,
    but ppdev in 2.3.x can. Perhaps you'd like to try that, or else fiddle
    around with the timings in the 2.2.x ppdev.c to see what works for you
    (please let me know the results).


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