Post by thread:I2C Snooper

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 ==================================================================

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-) -- ********************************************************** * Thomas Magin FON: ++49-761-4543-489 * * marquette-Hellige GmbH FAX: -507 * * E-FW / Emergency Systems email: spam_OUTmaginTakeThisOuThellige.de * * Munzinger Str. 3 * * D-79111 Freiburg / Germany * **********************************************************

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.

>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 ==================================================================

<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 .....ImageLogicKILLspam@spam@ibm.net

Thanks, Win. I'll check into that! Andy At 02:05 PM 8/26/98 -0400, you wrote: {Quote hidden}><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 >ImageLogicKILLspamibm.net > > ================================================================== Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA ==================================================================

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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}> Thanks, Win. I'll check into that! > > Andy > > At 02:05 PM 8/26/98 -0400, you wrote: > ><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 > >KILLspamImageLogicKILLspamibm.net > > > > > ================================================================== > Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA > ================================================================== -- From: Ron Russ EMICROS - Embedded Micro Software (http://www.emicros.com) CANPORT - Lowest cost PC to Controller Area Network Adapter (http://www.emicros.com/canport.htm) CANTEC11 - 68HC11 SBC with Controller Area Network (http://www.emicros.com/cantec11.htm)

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 / RemoveMEwwlTakeThisOuTnetcomuk.co.uk _/ L_/ _/ W_/ Hardware & Software design / PCB Design / Consultancy _/ W_/ /_W_/ Industrial / Computer Peripherals / Hazardous Area /_W_/

<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 spamBeGoneImageLogicspamBeGoneibm.net