Re: Problem Configuring Micron sensor MT9D131 using i2c

From: Wolfram Sang <w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
To: "Tekkalkot,
	Seetaram (IE10)"
	<Seetaram.Tekkalkot-TF0kVB3jB5US+FvcfC7Uqw@public.gmane.org>
Cc: i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org
Subject: Re: Problem Configuring Micron sensor MT9D131 using i2c
Date: Fri, 30 May 2008 16:33:22 +0200	[thread overview]
Message-ID: <20080530143322.GA4872@pengutronix.de> (raw)
In-Reply-To: <1106299A6DFA0E4D8E13CFD83A7611F09E2CA1-8tR4ov5Cr7uXeP9mKtfZqKJzXdaVS04K4Jgwf8ORaLoAvxtiuMwx3w@public.gmane.org>

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Hi,

On Fri, May 30, 2008 at 04:36:03PM +0530, Tekkalkot, Seetaram (IE10) wrote:

> 1.	As per the datasheet the i2c read address is 0x91 and write
> address is 0x90, should I set any of these slave addresses based on
> whether I am reading or writing?
The datasheet seems obscure. An I2C-address is 7-bit and then there is a
bit stating if the access shall be r/w. Of course, together they form a
byte, but the address is 7 bit _only_ (there is a 10 bit extension, but
this exception does not apply here). So, the _address_ is 0x48.

> 2.	I am using 7 bits from 0x91 which 0x48, is this correct?
Yes.

> 3.	Why i2cdetect doesn't detect this device and also i2cget can't
> read from register 0x00?
Is there anything detected on that bus? Is there something else
connected to that bus?

All the best,

   Wolfram

-- 
  Dipl.-Ing. Wolfram Sang | http://www.pengutronix.de
 Pengutronix - Linux Solutions for Science and Industry

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