From owner-freebsd-arm@FreeBSD.ORG Tue Sep 30 05:02:36 2014 Return-Path: Delivered-To: freebsd-arm@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id F00A536E for ; Tue, 30 Sep 2014 05:02:36 +0000 (UTC) Received: from alogt.com (alogt.com [69.36.191.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C8E66A18 for ; Tue, 30 Sep 2014 05:02:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=alogt.com; s=default; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To:From:Date; bh=fhR/Z9zNawQAY2bMg6+Av9aBMPB8FYWMOdkz8yLnMew=; b=bhfcGtoVjOlAHkJjbPLC+3k5Xwj4KRZ0ublS2wVN8R6jObW0N7/FoOkqH0uJn3T2HEerihq7EkOAQEUwC671Ku52pVgB66KrVYOParvp5EnJsAFIkN+LQlRYbryWl+0kWSBXYsGooiF57zBf3a6VzglxsgHFKZl4VvgY0WCC3Zc=; Received: from [182.5.218.90] (port=23612 helo=X220.alogt.com) by sl-508-2.slc.westdc.net with esmtpsa (SSLv3:AES128-SHA:128) (Exim 4.82) (envelope-from ) id 1XYpa6-001RfP-FG; Mon, 29 Sep 2014 23:02:35 -0600 Date: Tue, 30 Sep 2014 13:02:29 +0800 From: Erich Dollansky To: Luiz Otavio O Souza Subject: Re: Documentation for using GPIO Message-ID: <20140930130229.610ef43e@X220.alogt.com> In-Reply-To: References: <20140929080337.46bbb5a3@X220.alogt.com> <20140930081618.122a0c79@X220.alogt.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - sl-508-2.slc.westdc.net X-AntiAbuse: Original Domain - freebsd.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - alogt.com X-Get-Message-Sender-Via: sl-508-2.slc.westdc.net: authenticated_id: erichsfreebsdlist@alogt.com X-Source: X-Source-Args: X-Source-Dir: Cc: "freebsd-arm@freebsd.org" X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Sep 2014 05:02:37 -0000 Hi Luiz, On Tue, 30 Sep 2014 01:41:38 -0300 Luiz Otavio O Souza wrote: > On 29 September 2014 21:16, Erich Dollansky wrote: > > On Mon, 29 Sep 2014 16:27:26 -0300 > > Luiz Otavio O Souza wrote: > > > >> > is there some documentation available of how to use GPIO on a > >> > Raspberry Pi B+ than man gpio, man gpioctl etc? > >> > > >> Unfortunately not, there is the Wiki page > >> (https://wiki.freebsd.org/FreeBSD/GPIO) but it doesn't add much. > >> > > I ave read this. > > > >> But we can try to help you whenever possible, just post your > >> questions and we'll try to address them. > > > > I am currently working on a C program which should use GPIO to > > switch relais and read the state of switches via GPIO. I would like > > to make this program as simple as possible by creating first a > > layer which provides then functions like set (Pin), reset (Pin) > > and read (Pin) only. Of course plus the things needed to open, > > close and configure the interface. > > > > The best I have found until now are the sources of gpioctl. I am > > currently looking at the source. > > > > Is this the best start? > > You can use the excellent rpaulo's libgpio: > > https://bitbucket.org/rpaulo/libgpio/src/1dfe793d0b0cd6caff2e196cf667a5c06bbade8d/libgpio.h?at=default > > It provides all the GPIO low level functions in a clear and simple > way. this looks good too. Erich