> -----Original Message-----
> From: Olin Lathrop [SMTP:olin_piclist@EMBEDINC.COM]
> Sent: Thursday, May 17, 2001 5:21 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: I2C slave software for the PC to talk to a PIC
>
> > The I2C resources on the piclist.com site and in the archives and on
> google
> > don't seem to include PC I2C slave software...
> >
> > ...which would seem to be very useful for testing PIC I2C masters...
> >
> > ...am I just missing it?
>
> What hardware would you have the PC use for IIC?  "Standard" PCs don't
> come
> with IIC ports.  IIC requires two open collector drivers.  I vaguely
> remember that some of the parallel port control lines are open collector,
> but am not sure.  Even if so, you would need to write a custom kernel mode
> device driver to mess with the parallel port in a non-standard way.  It
> would be easier to hook a PIC to a serial port or parallel port and have
> it
> do IIC for the PC.
>
> Besides, IIC is not well suited for distance like RS-232 is.  I think of
> IIC
> as being an "on board" bus.
>
I2C master out of the parallel port is very simple, even through VB and on
NT based OS with freely available port drivers.  There is a linux I2C driver
available.

The "slave " part of the topic is the tricky bit...

Mike

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