From owner-freebsd-hackers  Wed Jul 22 03:56:44 1998
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From: Peter Dufault <dufault@hda.com>
Message-Id: <199807221028.GAA24059@hda.hda.com>
Subject: Re: I2C and SMB development status
In-Reply-To: <19980719123220.02032@breizh.prism.uvsq.fr> from Nicolas Souchu at "Jul 19, 98 12:32:20 pm"
To: Nicolas.Souchu@prism.uvsq.fr (Nicolas Souchu)
Date: Wed, 22 Jul 1998 06:28:20 -0400 (EDT)
Cc: freebsd-hackers@FreeBSD.ORG, freebsd-multimedia@FreeBSD.ORG,
        mbouget@club-internet.fr
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> Hi there,
> 
> I'd like to synchronize current works on I2C and SMB
> 
> Here we have developed an I2C framework with a PCF (master/slave) driver.
> It looks like this:
> 
> 
> +---------+ +----------+
> | iic I/O | | if_ic.c  |		DEVICES
> +---------+ +----------+
> 
> +----------------------+
> |      iicbus          |		BUS
> +----------------------+
> 
> +---------+ +----------+
> |  pcf    | | bit-bang |		ADAPTERS
> +---------+ +----------+
> 
> iic: master polled I/O allows to access any chip on the i2c bus

What do you mean here by "master polled I/O"?

> if_ic: point to point IP driver over i2c
> iicbus: i2c bus generic code (exactly like ppbus for parallel port)
> pcf: pcf driver
> bit-bang: bit banging driver not yet ported from Peter Dufault code
> (Peter, would you have time/want to port your big-banging code?)

My schedule doesn't permit it now.  Anyone interested in a non-blocking
bit banging implementation should look in the i2cslave code in
my i2c code.  Just now I'm more interested in getting some of your work
for the PCF since I need the interrupt driven version and haven't gotten
around to it yet.

Peter

-- 
Peter Dufault (dufault@hda.com)   Realtime development, Machine control,
HD Associates, Inc.               Safety critical systems, Agency approval

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