On Thursday 03 October 2019 10:48:10 Peter C. Wallace wrote:
> On Thu, 3 Oct 2019, Gene Heskett wrote:
> > Date: Thu, 3 Oct 2019 10:38:51 -0400
> > From: Gene Heskett <[email protected]>
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > <[email protected]>
> > To: [email protected]
> > Subject: Re: [Emc-users] Real-Time Linux on the Raspberry Pi
> >
> > On Thursday 03 October 2019 10:17:01 Peter C. Wallace wrote:
> >> On Thu, 3 Oct 2019, Gene Heskett wrote:
> >>> Date: Thu, 3 Oct 2019 10:08:00 -0400
> >>> From: Gene Heskett <[email protected]>
> >>> Reply-To: "Enhanced Machine Controller (EMC)"
> >>> <[email protected]>
> >>> To: [email protected]
> >>> Subject: Re: [Emc-users] Real-Time Linux on the Raspberry Pi
> >>>
> >>> On Thursday 03 October 2019 08:25:10 Thomas J Powderly wrote:
> >>>> Hi Gene, PCW,
> >>>> I just hooked up a second ethernet port to an rpi3b.
> >>>> I ssh'd into eth1 and ran a sim axis.
> >>>> pi@raspberrypi:~/linuxcnc-dev $ uname -a
> >>>> Linux raspberrypi 4.14.59-rt37-v7+ #1 SMP PREEMPT RT Sun Aug 26
> >>>> 15:11:25 +07 2018 armv7l GNU/Linux
> >>>>
> >>>> What tests can be run to see if this can use 'normal' mesa
> >>>> ethernet cards? without actually having them ?
> >>>> tomp
> >>>>
> >>>> The 'trick' to extra ethernet port without using the usb bridge
> >>>> is to use an ENC28J60 module connected to gpio pins ( no usb
> >>>> involved ) the ethernet is bitbanged spi
> >>>> here's a link to what i did ( altho i have different pins used
> >>>> and a slightly different module than he used )
> >>>> https://www.instructables.com/id/Super-Cheap-Ethernet-for-the-Ras
> >>>>pb err y-Pi
> >>>
> >>> Thats cute. But I see 2 potential problems.
> >>> 1. Its half duplex, is this compatible with mesa ethernet driven
> >>> cards? 2. its using the same signal lines the first spi port
> >>> (hm2_rpspi.ko) uses.
> >>>
> >>> It can likely be moved of course but will need bootup options to
> >>> do it I expect. Theres a discussion about spi on the pi3, and on
> >>> the pi4, but I don't have the links handy. I think the pi3 has 2
> >>> independent spi's with two slaves on each, AIUI, the pi4 has more
> >>> cs lines allowing more hardware to be addressed on a shared
> >>> circuit basis.
> >>>
> >>> 3. And two last questions, how fast is it? (Went back to link, 10
> >>> megabit, not really fast enough for a mesa card) and is it
> >>> reverseable? Eg, can it be used as a pair, driving the older 7i90
> >>> card over a longer cat5 link cable? An spi to spi link IOW? No.
> >>> Not fast enough. My currently working spi is running 4.2x faster
> >>> than that.
> >>>
> >>> Now if a 100 meg or even a gigabit version could be had...
> >>> Interesting idea.
> >>>
> >>> Cheers, Gene Heskett
> >>> --
> >>> "There are four boxes to be used in defense of liberty:
> >>> soap, ballot, jury, and ammo. Please use in that order."
> >>> -Ed Howdershelt (Author)
> >>> If we desire respect for the law, we must first make the law
> >>> respectable. - Louis D. Brandeis
> >>> Genes Web page <http://geneslinuxbox.net:6309/gene>
> >>>
> >>>
> >>> _______________________________________________
> >>> Emc-users mailing list
> >>> [email protected]
> >>> https://lists.sourceforge.net/lists/listinfo/emc-users
> >>
> >> A quick test would be to ping a fast host (with say a 200 byte
> >> packet) and look at the ping times.
> >>
> >> Note that there is at least one person using a RPI3 connected to a
> >> Mesa Ethernet card using the RPIs built in Ethernet with success
> >> even with the USB bridge. They did have to lower the servo thread
> >> rate to 500 Hz...
> >
> > I'm running a kilohertz on mine, but I have a jog-thread at 1 or 2
> > hundred hz, that handles all the manual stuff. Jog dials so I can
> > drive it by hand and some other "gingerbread" in the hal file. The
> > only place where I need more speed is in the video, its best
> > described as glacial.
>
> Do you have hardware OpenGL enabled? That makes a huge difference
>
raspbian stretch, doesn't know what opengl is. How do I enable it if its
supported?
Linux picnc 4.19.66-v7+ #1253 SMP Thu Aug 15 11:49:46 BST 2019 armv7l
GNU/Linux
> >> Peter Wallace
> >> Mesa Electronics
> >>
> >> (\__/)
> >> (='.'=) This is Bunny. Copy and paste bunny into your
> >> (")_(") signature to help him gain world domination.
> >>
> >>
> >>
> >> _______________________________________________
> >> Emc-users mailing list
> >> [email protected]
> >> https://lists.sourceforge.net/lists/listinfo/emc-users
> >
> > Cheers, Gene Heskett
> > --
> > "There are four boxes to be used in defense of liberty:
> > soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author)
> > If we desire respect for the law, we must first make the law
> > respectable. - Louis D. Brandeis
> > Genes Web page <http://geneslinuxbox.net:6309/gene>
> >
> >
> > _______________________________________________
> > Emc-users mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/emc-users
>
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
>
> _______________________________________________
> Emc-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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