From owner-freebsd-arm@FreeBSD.ORG Wed May 15 13:48:24 2013 Return-Path: Delivered-To: freebsd-arm@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 06661732 for ; Wed, 15 May 2013 13:48:24 +0000 (UTC) (envelope-from tom@0x544745.com) Received: from mail-oa0-f51.google.com (mail-oa0-f51.google.com [209.85.219.51]) by mx1.freebsd.org (Postfix) with ESMTP id C3F7DEF2 for ; Wed, 15 May 2013 13:48:23 +0000 (UTC) Received: by mail-oa0-f51.google.com with SMTP id f4so2151068oah.24 for ; Wed, 15 May 2013 06:48:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:x-gm-message-state; bh=XSaPtaJthzK39Esma12rBiEEDbrcyzME1cit6nk6tvw=; b=jUf3qjAkzbldAa+F7xFeiohIfeTgQXwfy4KOor1UzLLb2yxFsvj0HkuxTQSI3chzNT l0GOzTre/JPuq3ZwSNUxUY4FnJfg3gybH8Dp9cqki+FNubFN+2DlkgUVjX9oV4/F2by/ UHVT+A1uGZofN/wog4nKtETeQEtMBKeCVwm50NHttZOETRJOW70aKRFJjCxmZLVobmbg NXXnISpGm9OGdLi5SfnGllI6vV6BhRXIwBm8G7HWL4N8eHa3duF/OEZgi5W6EqXGzbCl iReRc+Frx2LM8/ZCCAbAvUQdfRKQuzs5UQyI6RoEX8+UQQXhrzO+HiUwrX9QFnbG6Ugm +Uwg== MIME-Version: 1.0 X-Received: by 10.60.62.198 with SMTP id a6mr19785574oes.22.1368625703199; Wed, 15 May 2013 06:48:23 -0700 (PDT) Received: by 10.182.31.11 with HTTP; Wed, 15 May 2013 06:48:23 -0700 (PDT) In-Reply-To: References: <20130514192448.7b48e095.ray@freebsd.org> <20130515021751.8848a996.ray@freebsd.org> <20130515122955.4387631e9969ae460f6500c7@freebsd.org> Date: Wed, 15 May 2013 07:48:23 -0600 Message-ID: Subject: Re: RS-232 driver for GPIO From: Tom Everett To: Warner Losh X-Gm-Message-State: ALoCoQmpKi6imnoe0ydX5X8MVS8bjAZaxI3UrIYWjqWWuRViePByOOESJH18RJhuKfNzPckKDMPC Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.14 Cc: Aleksandr Rybalko , "freebsd-arm@freebsd.org" X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Porting FreeBSD to the StrongARM Processor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 15 May 2013 13:48:24 -0000 Thank-you! On Wed, May 15, 2013 at 7:46 AM, Warner Losh wrote: > > On May 15, 2013, at 9:40 AM, Tom Everett wrote: > > > ok, just one further question. It was basically guess work that enabled > me > > to decypher that /dev/ttyu0 (sio0) was bound to uart0. I presume there > > must be some simple way from the command line to query the OS and find > out > > which hardware devices are bound to which /dev/ entries? > > The unit numbers generally match the alias names in the FDT. > > However, we don't note what the names for the nodes we're attaching to on > FDT systems. We really should, but we don't... > > Warner > > > > On Wed, May 15, 2013 at 3:29 AM, Aleksandr Rybalko > wrote: > > > >> On Tue, 14 May 2013 20:24:42 -0600 > >> Tom Everett wrote: > >> > >>> Did you mean 14 &15, or 14 & 16? > >> Yeah, right. > >> > >> > >>> ok so given this, I've done some reading. I'm by no means a FreeBSD > >>> expert, so forgive me if I'm completely wrong. I see this in the FDT: > >>> > >>> /* UART0 */ > >>> pins_uart0_a: uart0_a { > >>> broadcom,pins = <14>, <15>; > >>> broadcom,function = "ALT0"; > >>> }; > >> > >> If you satisfied by single UART, you no need change that. > >> > >> > >>> > >>> > >>> and this: > >>> > >>> chosen { > >>> bootargs = ""; /* Set by VideoCore */ > >>> stdin = "uart0"; > >>> stdout = "uart0"; > >>> }; > >>> > >> > >> But that stdin and stdout direct kernel console messages to air by your > >> xbee :) > >> So you need comment it or set different in/out device. > >> > >> > >>> > >>> So I interpret that to mean that uart0 is bound to pins 14, 15, and > >>> furthermore that the serial device bound to uart0 is bound to stdin and > >>> stdout. In my /dev/ I see: > >>> > >>> crw------- 1 root wheel 0x1f Apr 27 13:42 ttyu0 > >>> crw------- 1 root wheel 0x20 Apr 27 21:42 ttyu0.init > >>> crw------- 1 root wheel 0x21 Apr 27 21:42 ttyu0.lock > >>> crw-rw---- 1 uucp dialer 0x22 Apr 27 21:42 cuau0 > >>> crw-rw---- 1 uucp dialer 0x23 Apr 27 21:42 cuau0.init > >>> crw-rw---- 1 uucp dialer 0x24 Apr 27 21:42 cuau0.lock > >>> > >>> So, that is telling me that sio0 is bound to uart0, which is a serial > >>> console? > >> > >> Yep. > >> > >>> > >>> If so, that means that I could use pins 14 & 15 for rs-232, but I would > >>> have to chose b/t using those pins to talk to another device (xbee), > or a > >>> serial console? > >> > >> if you will disconnect serial console you will have to choose between > >> control over network (SSH/telnet/etc) or graphic console (Display with > >> HDMI + USB keyboard). > >> > >>> > >>> > >>> > >>> > >>> > >>> On Tue, May 14, 2013 at 5:17 PM, Aleksandr Rybalko > >> wrote: > >>> > >>>> On Tue, 14 May 2013 12:20:08 -0600 > >>>> Tom Everett wrote: > >>>> > >>>>> ok so the FDT definition would have to be added here? > >>>>> > >>>>> > >>>> > >> > http://svnweb.freebsd.org/base/head/sys/boot/fdt/dts/bcm2835-rpi-b.dts?view=markup > >>>>> > >>>> > >>>> Yeah, right. > >>>> > >>>> But I have bad news. Both UARTs can be connected to pairs(tx+rx) > 14+16, > >>>> 32+33, 40+41 and both UARTs can be connected to any of this pins. > >>>> But only 14, 16 and 40(PWM0) wired to ext.pin. > >>>> > >>>>> > >>>>> > >>>>> On Tue, May 14, 2013 at 10:24 AM, Aleksandr Rybalko >>> > >>>>> wrote: > >>>>> > >>>>>> On Tue, 14 May 2013 09:06:44 -0700 > >>>>>> Adrian Chadd wrote: > >>>>>> > >>>>>>> ... the r-pi actually has an RS232 port exposed via GPIO. It's > >>>>>>> only 3.3v but it's there. > >>>>>>> > >>>>>>> Someone just needs to write up an SIO driver for it and then put > >>>>>>> the GPIO pins in question into RS232 "mode". > >>>>>> > >>>>>> we have it already :) (console works on uart) > >>>>>> only FDT definition is required. > >>>>>> And maybe some fixes for boudrate setting and/or format setup > >>>>>> (bits/parity/stop bits/etc) > >>>>>> > >>>>>>> > >>>>>>> Yay multi-function GPIO pins! > >>>>>>> > >>>>>>> > >>>>>>> > >>>>>>> adrian > >>>>>>> > >>>>>>> > >>>>>>> On 14 May 2013 08:58, Tom Everett wrote: > >>>>>>>> Good morning ARM mailing list. > >>>>>>>> > >>>>>>>> I've been running FreeBSD on my Pi, and I've now got two XBee > >>>>>>>> Pros which I hope to connect. XBee's communicate over RS-232. > >>>>>>>> > >>>>>>>> https://www.sparkfun.com/products/8742 > >>>>>>>> > >>>>>>>> I see from the source tree that it was possible to attach the > >>>>>>>> iic driver to GPIO pins in software: > >>>>>>>> > >>>>>>>> > >>>> > http://svnweb.freebsd.org/base/head/sys/dev/gpio/gpioiic.c?view=markup > >>>>>>>> > >>>>>>>> I'm wondering, it is possible to connect the FreeBSD serial > >>>>>>>> driver for RS-2332 to GPIO in a similar way to how iic was > >>>>>>>> connected? > >>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>>>>> -- > >>>>>>>> A better world shall emerge based on faith and understanding - > >>>>>>>> Douglas MacArthur > >>>>>>>> _______________________________________________ > >>>>>>>> freebsd-arm@freebsd.org mailing list > >>>>>>>> http://lists.freebsd.org/mailman/listinfo/freebsd-arm > >>>>>>>> To unsubscribe, send any mail to > >>>>>>>> "freebsd-arm-unsubscribe@freebsd.org" > >>>>>>> _______________________________________________ > >>>>>>> freebsd-arm@freebsd.org mailing list > >>>>>>> http://lists.freebsd.org/mailman/listinfo/freebsd-arm > >>>>>>> To unsubscribe, send any mail to > >>>>>>> "freebsd-arm-unsubscribe@freebsd.org" > >>>>>> > >>>>>> > >>>>>> -- > >>>>>> Aleksandr Rybalko > >>>>>> > >>>>> > >>>>> > >>>>> > >>>>> -- > >>>>> A better world shall emerge based on faith and understanding - > >>>>> Douglas MacArthur > >>>> > >>>> > >>>> -- > >>>> Aleksandr Rybalko > >>>> > >>> > >>> > >>> > >>> -- > >>> A better world shall emerge based on faith and understanding - Douglas > >>> MacArthur > >> > >> Good luck! And let us know how things is going :) > >> > >> WBW > >> -- > >> Aleksandr Rybalko > >> > > > > > > > > -- > > A better world shall emerge based on faith and understanding - Douglas > > MacArthur > > _______________________________________________ > > freebsd-arm@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-arm > > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" > > -- A better world shall emerge based on faith and understanding - Douglas MacArthur