Delivered-To: daveyxm@virginmedia.com Received: by 10.50.203.68 with SMTP id ko4csp58787igc; Thu, 27 Mar 2014 14:42:07 -0700 (PDT) X-Received: by 10.204.197.202 with SMTP id el10mr4541890bkb.24.1395956526920; Thu, 27 Mar 2014 14:42:06 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com. [195.171.43.25]) by mx.google.com with ESMTP id yy2si2382547bkb.174.2014.03.27.14.42.06 for ; Thu, 27 Mar 2014 14:42:06 -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 1WTI2W-00026i-4A for rs_out_1@blacksheep.org; Thu, 27 Mar 2014 21:40:44 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WTI2V-00026Z-La for rsgb_lf_group@blacksheep.org; Thu, 27 Mar 2014 21:40:43 +0000 Received: from smtpout4.wanadoo.co.uk ([80.12.242.68] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1WTI2T-0007cw-Vp for rsgb_lf_group@blacksheep.org; Thu, 27 Mar 2014 21:40:42 +0000 Received: from AGB ([2.27.183.82]) by mwinf5d58 with ME id ilge1n00D1n4h1u03lge4g; Thu, 27 Mar 2014 22:40:41 +0100 Message-ID: From: "Graham" To: References: In-Reply-To: Date: Thu, 27 Mar 2014 21:40:36 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) 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: Joe, Yes , that can be done , but relies on a constant cpu 'load' , not sure as to how much jitter there could be using that method . seems the documentation is a bit thin , if you want to go out side the usual .. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.68 listed in list.dnswl.org] X-Scan-Signature: 6ffbd2c9950b634d6cc91f9565b01a8b Subject: Re: LF: Raspberry PI ,gpio pin 4 clock rate under 32 KHz HOW ? Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=MISSING_OUTLOOK_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 Joe, Yes , that can be done , but relies on a constant cpu 'load' , not sure as to how much jitter there could be using that method . seems the documentation is a bit thin , if you want to go out side the usual .. Tnx-G, -------------------------------------------------- From: Sent: Wednesday, March 26, 2014 10:25 PM To: Subject: Re: LF: Raspberry PI ,gpio pin 4 clock rate under 32 KHz HOW ? > 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, >