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'I2C Snooper'
1998\08\27@105851 by Andy Kunz

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Does anybody have an I2C bus snooper?

I need to be able to see all the data that's being passed back and forth
between two ICs so I can determine where some invalid data is originating.
I sure don't need to re-invent the wheel.

Thanks.

Andy

==================================================================
Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
==================================================================

1998\08\27@112345 by Thomas Magin

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At 10:04 27.08.98 -0400, you wrote:
>Does anybody have an I2C bus snooper?
>

Hi,

if there is a device already available, please forward the info ! Up to now
I'm using a DSO.

Thx

Thomas
=8-)

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1998\08\27@122624 by Keith H

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Andy Kunz wrote:
>
> Does anybody have an I2C bus snooper?
> I don't, and though it's something I'd love to have,
I reckon it will take a fair bit of work.

You'd need some hardware to capture and hold the states,
from at least two directions.
Presume a PC would be capturing the data flow,
much like RS232/485 protocol analysers.

If you do embark on such a project I'd be glad to help.

1998\08\27@124012 by Andy Kunz

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>You'd need some hardware to capture and hold the states,
>from at least two directions.
>Presume a PC would be capturing the data flow,
>much like RS232/485 protocol analysers.

The output would be all the data which appeared on the bus - address, data,
etc. - to a single RS-232 port going into my PC, which captures the data.

I already have a basic concept coded, I just felt it might be nicer to use
something rather than re-invent the wheel.

Andy

==================================================================
Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
==================================================================

1998\08\27@154003 by Engineering Department
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<Andy Kuntz writes>

>Does anybody have an I2C bus snooper?
>
>I need to be able to see all the data that's being passed back and forth
>between two ICs so I can determine where some invalid data is originating.
>I sure don't need to re-invent the wheel.
>

An outfit called MIIC ((609) 466-1751) makes DOS and Windoze
software with I2C probes.

12.5 KHz or 100 KHz data clocking but the software doesn't
seem to sample faster than 50us -- Windows is slower than
DOS, but not by a lot.

Odd thing is that requested data can't be saved in a file.

If your data isn't moving too fast this might work.

Cheers,

Win Wiencke
Image Logic Corporation
.....ImageLogicKILLspamspam@spam@ibm.net

1998\08\27@164045 by Andy Kunz

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Thanks, Win.  I'll check into that!

Andy


At 02:05 PM 8/26/98 -0400, you wrote:
{Quote hidden}

==================================================================
Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
==================================================================

1998\08\27@165454 by dparker

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There's an ad in Circuit Cellar Ink - http://www.mcc-us.com

Micro Computer Control 609-466-1751

Andy Kunz wrote:
{Quote hidden}

--
Donald C. Parker, Keystone Applications, Brooklyn, WI Phone:
608-835-9264
Primary Inet:
.....dparkerKILLspamspam.....execpc.com
Secondary:
EraseMEparkerspam_OUTspamTakeThisOuTacm.org
WWW:
http://acm.org/~parker/homepage.html

An alarming new study shows that U.S. students are doing worse than
ever
on standardized math tests because many of them can no longer figure
out
how to turn on their calculators. Dave Barry, 1993 in Review

1998\08\27@172210 by Pete Klammer

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ad in Circuit Cellar INK, Issue 95 June 1998, page 93:

I2C Bus Tools
* I2C Bus Monitor
* I2C Bus Analyzer
...
MCC
Micro Computer Control
PO Box 275
Hopewell NJ 08525
Phone(609)466-1751
Fax: (609)466-4116
infospamspam_OUTmcc-us.com
http://www.mcc-us.com

I have no personal experience with this outfit; tell us if you try it.

Peter F. Klammer / @spam@PKlammerKILLspamspamRacom.com
Racom Systems, Inc. / 6080 Greenwood Plaza Blvd / Englewood CO 80111
(303)773-7411 / FAX:(303)771-4708


{Original Message removed}

1998\08\27@210757 by ronruss

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I have an I2C to RS232 board that uses a 16C63 (or 16C66) available for I2C
communications. It's used in master mode. Could the I2C interface on the PIC
listen to the traffic without ack'ing the data? It would have to ignore the
address.
Is there a 'need' for this type of I2C device?


Andy Kunz wrote:

{Quote hidden}

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From: Ron Russ
  EMICROS  - Embedded Micro Software
 (http://www.emicros.com)
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 (http://www.emicros.com/canport.htm)
  CANTEC11 - 68HC11 SBC with Controller Area Network
 (http://www.emicros.com/cantec11.htm)

1998\08\28@054207 by wwl

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On Thu, 27 Aug 1998 10:04:22 -0400, you wrote:

>Does anybody have an I2C bus snooper?
>
>I need to be able to see all the data that's being passed back and forth
>between two ICs so I can determine where some invalid data is originating.
>I sure don't need to re-invent the wheel.
>
>Thanks.
>
>Andy
>
>==================================================================
>Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA
>==================================================================
Philips do an I2C bus interface chip which can be used as a bus
monitor. There is also a PC ISA card available using this chip, which
I think comes with monitor software, Let me know if you want details &
I'll dig it out.
You could probably also do it using the I2C support in the larger
PICs.
    ____                                                           ____
  _/ L_/  Mike Harrison / White Wing Logic / RemoveMEwwlTakeThisOuTspamnetcomuk.co.uk  _/ L_/
_/ W_/  Hardware & Software design / PCB Design / Consultancy  _/ W_/
/_W_/  Industrial / Computer Peripherals / Hazardous Area      /_W_/

1998\08\28@112608 by Engineering Department

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<Andy Kunz asked>
>>Does anybody have an I2C bus snooper?
<snip>

<Mike Harrison  responds>

> Philips do an I2C bus interface chip which can be used as a bus
> monitor. There is also a PC ISA card available using this chip, which
> I think comes with monitor software, Let me know if you want details &
> I'll dig it out.
> You could probably also do it using the I2C support in the larger
> PICs.


Are you thinking of the PCD8584?  I had a devil of a time interfacing
(logically) with that little bugger.  Works though, but I'm not sure it
isn't simpler to bit bang a PIC.

There's an awful lot of bandwidth lost to the housekeeping on that chip.
"Can I talk to you?" "Do you have data?" "Can I talk to you?" "Gimme
the data" and so forth.

Cheers,

Win Wiencke
Image Logic Corporation
spamBeGoneImageLogicspamBeGonespamibm.net

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