Date: Fri, 25 Nov 2016 09:39:03 +0100 From: c279@dropcut.net To: freebsd-arm@freebsd.org Subject: Re: Raspberry Pi advice Message-ID: <20161125083903.GA25648@dropcut.net> In-Reply-To: <wu7vavcgrz7.fsf@banyan.cs.ait.ac.th> References: <wu7vavcgrz7.fsf@banyan.cs.ait.ac.th>
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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. > - 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/
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