Delivered-To: daveyxm@virginmedia.com Received: by 10.50.203.68 with SMTP id ko4csp125674igc; Wed, 26 Mar 2014 15:27:27 -0700 (PDT) X-Received: by 10.15.48.129 with SMTP id h1mr10995050eew.57.1395872846957; Wed, 26 Mar 2014 15:27:26 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com. [195.171.43.25]) by mx.google.com with ESMTP id x44si41635eep.90.2014.03.26.15.27.26 for ; Wed, 26 Mar 2014 15:27:26 -0700 (PDT) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1WSwGK-0006kO-LG for rs_out_1@blacksheep.org; Wed, 26 Mar 2014 22:25:32 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WSwGK-0006kF-A1 for rsgb_lf_group@blacksheep.org; Wed, 26 Mar 2014 22:25:32 +0000 Received: from nina.ucs.mun.ca ([134.153.232.76]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.82) (envelope-from ) id 1WSwGI-0002PS-FO for rsgb_lf_group@blacksheep.org; Wed, 26 Mar 2014 22:25:31 +0000 Received: from plato.ucs.mun.ca (plato.ucs.mun.ca [134.153.232.153]) by nina.ucs.mun.ca (8.13.1/8.13.1) with ESMTP id s2QMPOqI007670 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 26 Mar 2014 19:55:27 -0230 Date: Wed, 26 Mar 2014 19:55:24 -0230 (NDT) From: jcraig@mun.ca X-X-Sender: jcraig@plato.ucs.mun.ca To: rsgb_lf_group@blacksheep.org In-Reply-To: Message-ID: References: MIME-Version: 1.0 X-Spam-Score: -1.1 (-) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Graham, This is probably too simplistic, but you can toggle the output with a sleep(t) between to make a square f=1/(2t). Cheers Joe VO1NA [...] Content analysis details: (-1.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [134.153.232.76 listed in list.dnswl.org] -0.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 4ead635eadbaebfaa92cfec77deb715d Subject: Re: LF: Raspberry PI ,gpio pin 4 clock rate under 32 KHz HOW ? Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hi Graham, This is probably too simplistic, but you can toggle the output with a sleep(t) between to make a square f=1/(2t). Cheers Joe VO1NA On Wed, 26 Mar 2014, Graham wrote: > Raspberry PI ,gpio pin 4 clock rate under 32 KHz HOW ? > > Q Is there a way to produce a audio frequency clock . from gpio pin - 4 ? > > Dividing the main clock , would appear to be limited to app 32KHz > > is there another way to produce lower / audio frequency's ? > > Tnx -G,