Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758325Ab2HWKXr (ORCPT ); Thu, 23 Aug 2012 06:23:47 -0400 Received: from mail-ob0-f174.google.com ([209.85.214.174]:36745 "EHLO mail-ob0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753813Ab2HWKXm convert rfc822-to-8bit (ORCPT ); Thu, 23 Aug 2012 06:23:42 -0400 MIME-Version: 1.0 In-Reply-To: <331ABD5ECB02734CA317220B2BBEABC13EA1EA53@DBDE01.ent.ti.com> References: <1345617039-27469-1-git-send-email-anilkumar@ti.com> <201208220748.39106.arnd@arndb.de> <331ABD5ECB02734CA317220B2BBEABC13EA1B975@DBDE01.ent.ti.com> <331ABD5ECB02734CA317220B2BBEABC13EA1BDA9@DBDE01.ent.ti.com> <331ABD5ECB02734CA317220B2BBEABC13EA1EA53@DBDE01.ent.ti.com> From: Chinmay V S Date: Thu, 23 Aug 2012 15:53:10 +0530 Message-ID: Subject: Re: [PATCH v2] lis3lv02d: Add STMicroelectronics lis331dlh digital accelerometer To: "AnilKumar, Chimata" Cc: "carmine.iascone@st.com" , Arnd Bergmann , "gregkh@linuxfoundation.org" , "eric.piel@tremplin-utc.net" , "jic23@cam.ac.uk" , "greg@kroah.com" , "akpm@linux-foundation.org" , "broonie@opensource.wolfsonmicro.com" , "dmitry.torokhov@gmail.com" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 966 Lines: 24 > Note from datasheet, "1LSb=4g/4096 at 12bit representation, > ±2g Full-scale" Precisely my point. All the datasheet says is : 1. It is +/-2G mode --> so Numerator is 4G. 2. We are using 12bits --> so Denominator is 2^12 = 4096. There is no clear reason/justification as to why 12bits was chosen in the first place. At this point unless someone from the design/original-driver team actually confirms why the 12bit representation was chosen, it is all conjecture on our part. If you have the actual LIS331DLH hardware, can you verify if the lower 4bits do actually contain any data (or are they always zero). This will help us decide whether to use them(16bit mode) or discard them(12bit mode)?... regards ChinmayVS -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/