From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ned Forrester Subject: Re: SPI or CSPI transfers using DMA Date: Thu, 20 Nov 2008 18:07:07 -0500 Message-ID: <4925ED9B.305@whoi.edu> References: <10811398.477881225431989704.JavaMail.nabble@isper.nabble.com> <200811201339.28627.david-b@pacbell.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, magene-5892unH0nlnYtjvyW6yDsg@public.gmane.org To: David Brownell Return-path: In-Reply-To: <200811201339.28627.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: spi-devel-general-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-spi.vger.kernel.org David Brownell wrote: > On Thursday 30 October 2008, magene-5892unH0nlnYtjvyW6yDsg@public.gmane.org wrote: >> I've been developing an application on an Eurotech (formerly >> Applied Data Systems) Bitsy Xb PXA270 board >> I'd like to use DMA put the DMA engine on the PXA270 has >> a pretty steep learning curve. Does anyone have a code example >> that could help jumpstart me? > > Our resident expert from Woods Hole has a similar data > streaming application, using PXA and DMA. Maybe he can > share a few words of wisdom ... I already did, on 10/31/08. I have not heard back. While I referenced pxa2xx_spi.c as a useful example of setting up DMA, Gene should note that we recently discovered that the RX and TX DMA memory mappings are performed in the wrong order in that code. Interesting... I did not note before that Gene is at MBARI, one of our sister oceanographic research facilities. :-) -- Ned Forrester nforrester-/d+BM93fTQY@public.gmane.org Oceanographic Systems Lab 508-289-2226 Applied Ocean Physics and Engineering Dept. Woods Hole Oceanographic Institution Woods Hole, MA 02543, USA http://www.whoi.edu/sbl/liteSite.do?litesiteid=7212 http://www.whoi.edu/hpb/Site.do?id=1532 http://www.whoi.edu/page.do?pid=10079 ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/