Re: [CAD_CAM_EDM_DRO] Re: Raspberry Pi for CADCAM CNC? - first task .... realtime RasPi

This is VERY MUCH Fantastic news! I Thank you for posting and including
links. Last few months I have spent a lot of time researching the
Rasp-Pi. Didnt know it could handle EMC or be ported over. Could you
tell me if possible which Linux is running the EMC2? I only thought
Debian and Arch-Linux were the only ones ported over to Raspberry Pi ??
I'll have to read your links about Xenomai onboard.

I would be VERY intimidated to run such a TINY box, having it control a
1-Ton mill at "Any Speed!" ha! Hard to build trust in such a tiny
thing called Raspberry-Pi....
I'll readup more on your links, and if its OK I'd like to swap-notes
with someone directly.

Regards
Vince

On 3/8/2013 1:14 PM, Doug Fortune wrote:
>
>
> Running CNC on the RaspberryPi is very experimental, for DIY Linux
> kernel experts only, but this might give you a place to begin.
>
> RasPi might run LinuxCNC/EMC2 in non-realtime mode, at least for
> testing. Or, non-realtime might just be "good enough" for your
> application.
>
> --------
>
> There have been several attempts to get real time running on the RasPi,
> including Xenomai on Raspberry Pi
>
> Here are some list excerpts:
>
> http://powet.eu/2012/07/25/raspberry-pi-xenomai/ Xenomai on Raspberry Pi
>
> >
> > Ok, I installed it on the Raspberry Pi....
> >
> > (log in as "jed" password "jed" su to root, as realtime only runs
> > in root mode)
> >
> > ldd hello
> > ldd hello2
> >
> > needs libxenomai.so.0 on the path, so..
> > cp -v /usr/xenomai/lib/libxenomai.so.0 /lib
> >
> >
> > now, as root .....
> > ./hello works
> > ./hello2 works
> >
> > -------------
> >
> > problems:
> > - its FRENCH linux
> > - wrong keyboard, I can't type pipe "|" or quotes
> > - startx doesn't work to bring up a graphical UI
> >
> >
> >
> >
> >> http://powet.eu/2012/07/25/raspberry-pi-xenomai/ Xenomai on
> Raspberry Pi
> >>
> >> He says:
> >>
> >> Xenomai is a real-time development framework cooperating with the
> >> Linux kernel, in order to provide a pervasive, interface-agnostic,
> >> hard real-time support to user-space applications, seamlessly
> >> integrated into the GNU/Linux
> >> environment.http://en.wikipedia.org/wiki/Xenomai
> >> <http://en.wikipedia.org/wiki/Xenomai>
> >>
> >> It has slightly different goals than Linux-RTAI, which tries for the
> >> absolute minimal latencies. Xenomai attempts to be extensible and
> >> have wide compatability. Xenomai used to have a RTAI compatability
> >> skin but apparently this is buggy and deprecated. Speedwise RTAI is
> >> best followed by xenomai followed by RT_PREEMPT.
> >>
> >> if you just want to try xenomai here is my latest image (for 8GB HDSC
> >> card)
> >>
> >> wget -c powet.eu/raspberrypi/xenomai.img
> >>
> >>
> >>
> >> Username: jed Password: jed
> >>
> >> SHA-1 bb71b783d3d20edd58287eb1b0bf49bd5d9007de
> >>
> >>
> >> http://www.raspberrypi.org/phpBB3/viewtopic.php?f=41&t=12368
> >>
> >> I created a patch to get the Raspberry Pi to compile and work with
> >> the Xenomai 2.6.1 real-time framework with Linux 3.2.21, which I am
> >> sharing here with everybody.
> >>
> >> After doing some minor testing, it seems to be running fine. Keep in
> >> mind that I've never done Linux kernel development before, so it
> >> could be that what the code does is wrong is some way, or could be
> >> improved. I welcome any suggestions or fixes!
> >>
> >> Depending on the kernel configuration, the patch will use one of two
> >> clock sources for updating the timestamp counter. If power management
> >> is enabled, the 1MHz System Timer will be used. If power management
> >> is disabled, the ARM Timer, configured to run at 250MHz, will be used
> >> instead. Keep in mind that the ARM Timer's clock is derived from the
> >> system clock. Since power management can dynamically change the
> >> system clock, the ARM Timer is only used if power management is
> >> disabled. See section 14 of the BCM2835 ARM Peripherals
> >>
> <http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf>
>
> >> guide for more details.
> >>
> >>
> >>
> >
>
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>
>



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