From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262034AbVEELYM (ORCPT ); Thu, 5 May 2005 07:24:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262035AbVEELYM (ORCPT ); Thu, 5 May 2005 07:24:12 -0400 Received: from open.hands.com ([195.224.53.39]:61630 "EHLO open.hands.com") by vger.kernel.org with ESMTP id S262034AbVEELYI (ORCPT ); Thu, 5 May 2005 07:24:08 -0400 Date: Thu, 5 May 2005 12:32:54 +0100 From: Luke Kenneth Casson Leighton To: Alan Cox Cc: Linux Kernel Mailing List , Linux ARM Kernel list Subject: Re: tricky challenge for getting round level-driven interrupt problem: help! Message-ID: <20050505113254.GI8537@lkcl.net> References: <20050503215634.GH8079@lkcl.net> <1115171395.14869.147.camel@localhost.localdomain> <20050504205831.GF8537@lkcl.net> <1115243014.19844.62.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1115243014.19844.62.camel@localhost.localdomain> User-Agent: Mutt/1.5.5.1+cvs20040105i X-hands-com-MailScanner: Found to be clean X-MailScanner-From: lkcl@lkcl.net Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 04, 2005 at 10:43:35PM +0100, Alan Cox wrote: > > hence the redesign to do alternate read-write-read-write, and making > > reads exclusive of writes, etc. > > and maybe even turn the IRQ off and use a timer if its slow and not > sensitive to latency.. ? good suggestion... been there, tried that [i really _am_ sending to lkml as last resort, not first!] jiffies equals approx 250? per second? baud rate from PIC is determined by GPS - 4800 baud - approx 600 per second. so that'd explain why i only got one character every 3. *cold sweat*. i could always use the FIQ, which will be running off the back of the Audio DAC/ADC's interrupts, 8khz.... *shudder*...