From: Andrew Lunn <andrew@lunn.ch>
To: Steven Clugston <steven.clugston@newcastle.ac.uk>
Cc: "ecos-discuss@ecos.sourceware.org" <ecos-discuss@ecos.sourceware.org>
Subject: Re: [ECOS] AT91 I2C driver
Date: Wed, 28 Oct 2009 12:38:00 -0000 [thread overview]
Message-ID: <20091028123741.GA11133@lunn.ch> (raw)
In-Reply-To: <4DCF6DBD3535F742BB167C528BBEE9803828B88A32@EXSAN01.campus.ncl.ac.uk>
On Wed, Oct 28, 2009 at 11:27:36AM +0000, Steven Clugston wrote:
> Is anybody out there interested in having/testing an AT91 I2C driver?
>
> I'm currently having a stab at writing one using the lpc2xxx one as
> a reference, although I'm not sure if I'll actually have time to see
> it through to completion yet.
A word of caution. The Linux kernel guys consider the AT91 I2C device
to be FUBAR.
http://cateee.net/lkddb/web-lkddb/I2C_AT91.html
http://www.mail-archive.com/git-commits-head@vger.kernel.org/msg24797.html
http://www.mail-archive.com/i2c@lm-sensors.org/msg02209.html
I think it is O.K. for single byte transfers, but anything more than
that could lead to problems.
Maybe you should consider bit banging the pins?
Andrew
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next prev parent reply other threads:[~2009-10-28 12:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-28 11:27 Steven Clugston
2009-10-28 12:38 ` Andrew Lunn [this message]
2009-10-28 13:04 ` Steven Clugston
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