From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 5043 invoked by alias); 24 Apr 2013 06:56:33 -0000 Mailing-List: contact ecos-patches-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: ecos-patches-owner@ecos.sourceware.org Received: (qmail 5021 invoked by uid 89); 24 Apr 2013 06:56:32 -0000 X-Spam-SWARE-Status: No, score=-2.8 required=5.0 tests=AWL,BAYES_00,KHOP_RCVD_UNTRUST,KHOP_THREADED,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 Received: from hagrid.ecoscentric.com (HELO mail.ecoscentric.com) (212.13.207.197) by sourceware.org (qpsmtpd/0.84/v0.84-167-ge50287c) with ESMTP; Wed, 24 Apr 2013 06:56:31 +0000 Received: from localhost (hagrid.ecoscentric.com [127.0.0.1]) by mail.ecoscentric.com (Postfix) with ESMTP id 333494680010 for ; Wed, 24 Apr 2013 07:56:29 +0100 (BST) Received: from mail.ecoscentric.com ([127.0.0.1]) by localhost (hagrid.ecoscentric.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8kyoGozujatC; Wed, 24 Apr 2013 07:56:20 +0100 (BST) From: bugzilla-daemon@bugs.ecos.sourceware.org To: ecos-patches@ecos.sourceware.org Subject: [Bug 1001397] I2C driver for Kinetis microcontrollers Date: Wed, 24 Apr 2013 06:56:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: eCos X-Bugzilla-Component: Patches and contributions X-Bugzilla-Keywords: X-Bugzilla-Severity: enhancement X-Bugzilla-Who: mjones@linear.com X-Bugzilla-Status: NEEDINFO X-Bugzilla-Priority: low X-Bugzilla-Assigned-To: ilijak@siva.com.mk X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://bugs.ecos.sourceware.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-04/txt/msg00069.txt.bz2 Please do not reply to this email, use the link below. http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001397 --- Comment #59 from Mike Jones --- After setting CPU clock to 100Khz: Freq Mode Meas 100Khz Std 98Khz 100Khz Agr 111Khz 400Khz Std 363Khz 400Khz Agr 416Khz >From an application point of view, this is a little problematic, in that: - When you set the goal and value, you don't get feedback in the configuration that tells you what the result will be. You have to get a scope and measure it. - If you want to make it more accurate, you have to either guess the correct CPU clock, or reverse engineer the algorithm to calculate the required clock manually. One solution might be to have the configuration calculate the proper CPU clock so you can then manually change the clock to get a better result. I am ok with committing the solution as is because I can figure it out for 100 and 400 and will have the only answers I need. I think it is just a question of how much you want to help the application programmer. -- You are receiving this mail because: You are on the CC list for the bug.