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'[EE]: [PIC]: PIC based EPP protocol monitor...'
2001\08\10@070802 by Wojciech Zabolotny

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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
                               spam_OUTwzabTakeThisOuTspamise.pw.edu.pl

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2001\08\10@085218 by Andy N1YEW

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why not just reverse enginer the driver?

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


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2001\08\10@091118 by wzab

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On Fri, Aug 10, 2001 at 08:46:22AM -0400, Andy N1YEW wrote:
> why not just reverse enginer the driver?

I'm afraid it may be illegal :-(. AFAIK the reverse engineering of protocol
to ensure compatibility is legal (at least in my country).

Addditionally the reverse engineering of the high level language written driver
(C I suppose) is much more complicated...

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                             Wojciech M. Zabolotny
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2001\08\10@205811 by Douglas Wood

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There are several parallel port monitor-type programs available on the
Internet (I know because I was just doing some research on them). A good
place to start might http://www.lvr.com. This might save you the effort of building
an entire project...

Douglas Wood
Software Engineer
dbwoodspamspam_OUTkc.rr.com

Home of the EPICIS Development System for the PIC and SX
http://epicis.piclist.com

{Original Message removed}

2001\08\13@042220 by Vasile Surducan

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On Fri, 10 Aug 2001, Wojciech Zabolotny wrote:

> I'd be glad to hear some suggestions:
> 1) Is it possible to overclock 16F877 2 times? Has anybody the experiences
>    with such configuration?

 No, I had good results only with 16F877/20MHZ running at 25MHz.

Vasile

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