From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5AA50C17442 for ; Wed, 13 Nov 2019 11:09:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 345CA222BD for ; Wed, 13 Nov 2019 11:09:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ysoft.com header.i=@ysoft.com header.b="q7O49WJ9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727171AbfKMLJr (ORCPT ); Wed, 13 Nov 2019 06:09:47 -0500 Received: from uho.ysoft.cz ([81.19.3.130]:42176 "EHLO uho.ysoft.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726339AbfKMLJr (ORCPT ); Wed, 13 Nov 2019 06:09:47 -0500 Received: from [10.1.8.111] (unknown [10.1.8.111]) by uho.ysoft.cz (Postfix) with ESMTP id F3E16A36F6; Wed, 13 Nov 2019 12:09:43 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ysoft.com; s=20160406-ysoft-com; t=1573643384; bh=9wU6KxqnR0Kw42lkPxAxiBvKKDA/fl3xWaNuzyFDdRA=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=q7O49WJ9UPTuSY8FWNuY1DbYfGo+E3Td6y5HLBlXCQo6DkcVhhXmEapuYzX4hLyr8 E38aa7uBq8U5sRsYzpw0LKlNZLV9T8fM+6j1DbX5CS2Xt/ixvEdkEKOKz3jzfOU7bs oC3A+0dKkyyLxPEl0mX8opeUKNjgUyEI1+eD4YD0= Subject: Re: [PATCH 3/5] iio: ping: add parallax ping sensors To: Jonathan Cameron , Andreas Klinger Cc: robh+dt@kernel.org, mark.rutland@arm.com, mripard@kernel.org, shawnguo@kernel.org, heiko@sntech.de, icenowy@aosc.io, laurent.pinchart@ideasonboard.com, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, gregkh@linuxfoundation.org, christophe.jaillet@wanadoo.fr, tglx@linutronix.de, mchehab+samsung@kernel.org, davem@davemloft.net, paulmck@linux.ibm.com, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org References: <20191107130045.rt3ix2atyjd3gekr@arbad> <20191110170650.00527b8b@archlinux> From: =?UTF-8?B?TWljaGFsIFZva8OhxI0=?= Message-ID: <196ba1f0-9d9f-9f46-c86e-2c41a7835c59@ysoft.com> Date: Wed, 13 Nov 2019 12:09:43 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20191110170650.00527b8b@archlinux> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org On 10. 11. 19 18:06, Jonathan Cameron wrote: > On Thu, 7 Nov 2019 14:00:47 +0100 > Andreas Klinger wrote: [snip] >> + * >> + * +---+ +------------------------+ >> + * GPIO | | | | >> + * ping: --+ +------------+ +---------------- >> + * ^ ^ ^ ^ >> + * |<->| interrupt interrupt >> + * udelay(5) (ts_rising) (ts_falling) >> + * |<---------------------->| >> + * . pulse time measured >> + * . --> one round trip of ultra sonic waves >> + * . . >> + * ultra +-+ +-+ +-+ . >> + * sonic | | | | | | . >> + * burst: ---------+ +-+ +-+ +----------------------------------------- >> + * . >> + * ultra +-+ +-+ +-+ >> + * sonic | | | | | | >> + * echo: ----------------------------------+ +-+ +-+ +---------------- > > Nice diagram ;) Using the '+' characters at the edges and '-' characters for levels makes it not easily readable in some cases. Especially for the short subsequent bursts. What about this? * GPIO ___ ________________________ * ping: __/ \____________/ \_________________ * ^ ^ ^ ^ * |<->| interrupt interrupt * udelay(5) (ts_rising) (ts_falling) * |<---------------------->| * . pulse time measured * . --> one round trip of ultra sonic waves * . . * ultra . . * sonic _ _ _. . * burst: ________/ \_/ \_/ \_________________________________________ * . * ultra . * sonic _ _ _. * echo: _________________________________/ \_/ \_/ \_________________ */ Michal