Date: Fri, 25 Nov 2016 18:12:08 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: Mark Millard <markmi@dsl-only.net> Cc: c279@dropcut.net, Olivier <Olivier.Nicole@cs.ait.ac.th>, freebsd-arm@freebsd.org Subject: Re: Raspberry Pi advice [RPI2B V1.2 is not ARMv7A but Cortex-A53, I'm afraid; slower than RPI3B, no WiFi/Bluetooth] Message-ID: <20161125171208.GC291@cicely7.cicely.de> In-Reply-To: <0292B13C-7E72-49F0-AC24-FC0B5496E7DC@dsl-only.net> References: <wu7vavcgrz7.fsf@banyan.cs.ait.ac.th> <20161125083903.GA25648@dropcut.net> <0292B13C-7E72-49F0-AC24-FC0B5496E7DC@dsl-only.net>
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On Fri, Nov 25, 2016 at 01:13:51AM -0800, Mark Millard wrote: > On 2016-Nov-25, at 12:39 AM, c279 at dropcut.net wrote: > > > Hi Oliver, > > > > On Fri, Nov 25, 2016 at 10:26:20AM +0700, Olivier wrote: > >> I am not sure I am on the right list, if not, please help and point me > >> to the correct one. > > This mailing list is primarily for individuals working to port FreeBSD > > to new ARM-based systems and improve existing support. > > General resources for the Raspberry Pi might be: > > * https://www.raspberrypi.org/resources/ > > * https://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/robot/buttons_and_switches/ > > * https://learn.adafruit.com/category/raspberry-pi > > > >> ... > >> My questions are the following: > >> - which version buying? 2B or 3B? > > The Raspberry Pi 2 has the best support[0] as of today. You can roll > > your own image for the Raspberry Pi 3[1] if you need to. I personally > > would choose an RPi2 for FreeBSD at this point. > > RPI2B V1.1 and before I think that is. The information I've found on > ordering a RPI2B V1.2 indicates is is now also a (slower) 64-bit arm > (Cortex-A53 quad core in a BCM2837), like the RPI3B. Slower than the same BCM2837 on the Pi3, but I don't think it is slower compared to the older Pi2 models. > For example: https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=163856 (From Oct.) > And: https://www.element14.com/community/community/raspberry-pi/raspberrypi2 > And: http://www.cnx-software.com/2016/11/21/raspberry-pi-2-gets-an-upgrade-to-64-bit-broadcom-bcm2837-processor-with-pcb-version-1-2/ > (You can find more.) > > "Previous versions of Raspberry Pi 2 Model B use the BCM2836 SoC, which > contains a quad-core ARM Cortex-A7 processor. The Raspberry Pi 2 Model B > v1.2 board uses BCM2837, which contains a quad-core ARM Cortex-A53 processor." > (This is from the element14 page.) > > RPI2B V1.1 is out of production from what I can tell, although one might > still be able to find one. It gets harder to find one over time. > > RPI2B V1.2 does not have WiFi/Bluetooth built in. > > It is too bad that they did not at least name it Raspberry Pi 2C. >From the pricepoint the new Pi2 Rev 1.2 is the same as the Pi3, but at lower CPU clock and without the WiFi/BT. I don't see any good reasons to buy a Pi2 anymore, unless for some regularoty reasons you can't have a WiFi/BT chip mounted or need the old LED location. Well - and curiosity, that's why I bought one of the Rev 1.2 myself. In direct comparison the Pi2B Rev 1.1 and Rev 1.2 look the same. The only difference is the revsion on the silk screen and the BCM chip. > > > >> - how GPIO does GPIO work? I need one input to generate interupts and > >> the other one to generate interupts but that I can also be able to > >> pull the value when there has been no interrupt. Is that possible? > > Yes. Here[2] is an example in C and in Python[3]. > > > >> - would it be possible to use the GPIO to generate a signal to sound > >> like a siren? > > Yes, but you can also attach speakers to the 3.5mm jack. This might be > > easier than fiddeling with GPIO fpr this purpose. > > > > > >> Best regards and thanks for the help, > > You're welcome, > > > > -hf > > > > > > > > [0] https://wiki.freebsd.org/FreeBSD/arm/Raspberry%20Pi > > [1] https://github.com/zxombie/freebsd/tree/arm64-rpi3 > > [2] https://vzaigrin.wordpress.com/2014/04/18/working-with-gpio-on-raspberry-pi-with-freebsd/ > > [3] https://vzaigrin.wordpress.com/2015/02/02/web-control-of-raspberry-pi-gpio-in-freebsd/comment-page-1/ > > > === > Mark Millard > markmi at dsl-only.net > > > _______________________________________________ > freebsd-arm@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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