why not just reverse enginer the driver?

andy
----- Original Message -----
From: Wojciech Zabolotny <wzab@ISE.PW.EDU.PL>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, August 10, 2001 7:06 AM
Subject: [EE]: [PIC]: PIC based EPP protocol monitor...


> Hi All,
>
> I need to reverse engineer the communication protocol used
> by a LPT connected scanner (the firm refuses to release
> the documentation necessary for writing a Linux driver :-( ).
> Therefore I need to build a SPP/EPP/ECP monitor, to be connected
> paralelly with the scanner, which will send the acquired data to the
> another PC (via USB or EPP)
> I think that it can be done with (maybe slightly overclocked) PIC
> (16F877 or 16C745 with USB?).
>
> I'd be glad to hear some suggestions:
> 1) Is it possible to overclock 16F877 2 times? Has anybody the experiences
>    with such configuration?
> 2) Is it possible to build a SIMPLE circuit detecting the "transmitting"
>    and "receiving" side of the LPT link? (Yes I know that it should be
>    possible to determine it from the control lines, but I suspect that
>    the protocol may be slightly different from the IEEE1284 specs).
> 3) Maybe someone know about a PIC/other projects which could be adapted
>    for that purpose. (I even considered writing the VHDL code for
>    implementation of such monitor on FPGA...)
> --
>
>                                 TIA & Regards,
>                                 Wojciech Zabolotny
>                                 wzab@ise.pw.edu.pl
>
> --
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>

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