[ECOS] AT91SAM and I2C

Laurie Gellatly laurie.gellatly@netic.com
Sun Jan 6 21:28:00 GMT 2008


-----Original Message-----
From: ecos-discuss-owner@ecos.sourceware.org
[mailto:ecos-discuss-owner@ecos.sourceware.org]On Behalf Of Andrew Lunn
Sent: Monday, 7 January 2008 8:12 AM
To: Jan Jacobs
Cc: ecos-discuss@ecos.sourceware.org
Subject: Re: [ECOS] AT91SAM and I2C


On Sun, Jan 06, 2008 at 11:01:51PM +0200, Jan Jacobs wrote:
> Hi All,
>
> I need an I2C (TWI) driver for the AT91SAM7X. I have started doing
> something, but want to find out if somebody has done one or has any
advice?

>I think somebody is working on such a driver. It was mentioned last
>month. Take a look in the mail archive.

> Secondly, I think there might be a flaw with the I2C IO package.
> If the device you communication to does not use internal addressing (RTC,
> Sensor, etc) then the I2C IO API works.
> If the device requires internal addressing (EEPROM) I do not see how that
> gets conveyed via the I2C IO API?

>I don't really follow. Do you want to make it look like the EEPROM is
>memory mapped?

Jan,
When you talk to a EEPROM then part of the I2C message is a command followed
by the memory address then the data is exchanged all across teh I2C bus.
You should see this in the Datasheet.

(apologies for duplicate message Andrew).

			...Laurie:{)


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