so, i have a full ubuntu-13.04 install on the ancient 2012 nexus tablet. now the only thing left to do is replace the ghastly gnome/unity desktop with something else. might have to do xfce or lxde but first thought i'd try tde if there's a version of it. do we know a repository that has an ARM7 port of whatever tde was around then?
Am Montag, 19. März 2018 schrieb dep:
so, i have a full ubuntu-13.04 install on the ancient 2012 nexus tablet. now the only thing left to do is replace the ghastly gnome/unity desktop with something else. might have to do xfce or lxde but first thought i'd try tde if there's a version of it. do we know a repository that has an ARM7 port of whatever tde was around then?
Doesn't the build for RPi3 work? It should be ARM7, I think.
nik
On Monday 19 March 2018 04:37:54 Dr. Nikolaus Klepp wrote:
Am Montag, 19. März 2018 schrieb dep:
so, i have a full ubuntu-13.04 install on the ancient 2012 nexus tablet. now the only thing left to do is replace the ghastly gnome/unity desktop with something else. might have to do xfce or lxde but first thought i'd try tde if there's a version of it. do we know a repository that has an ARM7 port of whatever tde was around then?
Doesn't the build for RPi3 work? It should be ARM7, I think.
nik
I've got jessie on an r-pi3b, and they call it an armhf. Running xfce. Color depth could be better, 5,6,5 framebuffer IIRC, makes about 7 frames a second, but would also be even slower. Just barely fast enough to run LinuxCNC.
Am Montag, 19. März 2018 schrieb Gene Heskett:
[...]
I've got jessie on an r-pi3b, and they call it an armhf. Running xfce. Color depth could be better, 5,6,5 framebuffer IIRC, makes about 7 frames a second, but would also be even slower. Just barely fast enough to run LinuxCNC.
Could you give me a hint where to download a working image? I'm struggling with RPi+LinuxCNC for ages, almost gave up that project.
Nik
On Monday 19 March 2018 11:30:44 Dr. Nikolaus Klepp wrote:
Am Montag, 19. März 2018 schrieb Gene Heskett:
[...]
I've got jessie on an r-pi3b, and they call it an armhf. Running xfce. Color depth could be better, 5,6,5 framebuffer IIRC, makes about 7 frames a second, but would also be even slower. Just barely fast enough to run LinuxCNC.
Could you give me a hint where to download a working image? I'm struggling with RPi+LinuxCNC for ages, almost gave up that project.
Nik
You might try googling for: linux-image-rpi2-rt_4.4.4-rt9-v7+-7_armhf.deb Which will at least give you a kernel that will run it. pin it. I can send that too.
The install is armbian jessie lite. Downloadable from the armbian site LinuxCNC is the uspace version of 2.8-pre. Weird config, no PID's used Works fine.
PM me, and I can send you what should be working configs IF you've installed and wired up a pair of MPJA's 100 ppr a/b encoders to function as hand wheels. This encoder is also available elsewhere, s/b under $25 a copy. Interface is a mesa 7i90HD, with 3 7i42TA's to protect the 3.3 volt 7i90HD from the noises. Spindle control is a 240 volt single ph input 1.5 hp vfd, running an old (probably about 40 yo) 3 ph, 1 horse I took off a scrapped air compressor. But no use further cluttering this list, so PM me.
Hi Gene!
Am Montag, 19. März 2018 schrieb Gene Heskett:
[...] The install is armbian jessie lite. Downloadable from the armbian site LinuxCNC is the uspace version of 2.8-pre. Weird config, no PID's used Works fine.
PM me, and I can send you what should be working configs IF you've installed and wired up a pair of MPJA's 100 ppr a/b encoders to function as hand wheels. This encoder is also available elsewhere, s/b under $25 a copy. Interface is a mesa 7i90HD, with 3 7i42TA's to protect the 3.3 volt 7i90HD from the noises. Spindle control is a 240 volt single ph input 1.5 hp vfd, running an old (probably about 40 yo) 3 ph, 1 horse I took off a scrapped air compressor. But no use further cluttering this list, so PM me.
Thank you for your hint. Sorry, no mesas in my shop, but at least I have some encoders waiting :-)
Ages ago I had a single RPi2 (the newer ones) running with linuxcnc + TDE and GPIO for signals, just like the parallelport. Latency was not so great (~ 20000ns), but at least the steppers turned. Last week I wanted to resurrect the project, just finding the RPi beeing unable to boot. Well, following your hints I came to the conclusion that almost anything is better than a RPi for CNC (oh my, never thought I would write that).
Now I've placed a T60 mainboard into a 15.4" T61p with libreboot (stock bios gives horrible latency) + linuxcnc + TDE + NativeCAM, looks neat and has nice latency (<2000ns).
Nik
On Tuesday 20 March 2018 08:19:14 Dr. Nikolaus Klepp wrote:
Hi Gene!
Am Montag, 19. März 2018 schrieb Gene Heskett:
[...] The install is armbian jessie lite. Downloadable from the armbian site LinuxCNC is the uspace version of 2.8-pre. Weird config, no PID's used Works fine.
PM me, and I can send you what should be working configs IF you've installed and wired up a pair of MPJA's 100 ppr a/b encoders to function as hand wheels. This encoder is also available elsewhere, s/b under $25 a copy. Interface is a mesa 7i90HD, with 3 7i42TA's to protect the 3.3 volt 7i90HD from the noises. Spindle control is a 240 volt single ph input 1.5 hp vfd, running an old (probably about 40 yo) 3 ph, 1 horse I took off a scrapped air compressor. But no use further cluttering this list, so PM me.
Thank you for your hint. Sorry, no mesas in my shop, but at least I have some encoders waiting :-)
Ages ago I had a single RPi2 (the newer ones) running with linuxcnc + TDE and GPIO for signals, just like the parallelport. Latency was not so great (~ 20000ns), but at least the steppers turned. Last week I wanted to resurrect the project, just finding the RPi beeing unable to boot. Well, following your hints I came to the conclusion that almost anything is better than a RPi for CNC (oh my, never thought I would write that).
Now I've placed a T60 mainboard into a 15.4" T61p with libreboot (stock bios gives horrible latency) + linuxcnc + TDE + NativeCAM, looks neat and has nice latency (<2000ns).
Nik
You will never generate software stepping thats usable on an r-pi w/o the mesa stuff. Does away with the base-thread. But as I added more ginger bread, to the halfile, I got to thinking that the stuff I has hacking into the halfile didn't even need a servo-thread speed, so I setup an even slower thread at 200HZ for that stuff & all works as expected.
2 main problems with the r-pi3b, only one of which is eliminated by the mesa interfaces, the other being that with anything like a rtai kernel, it throws away mouse and keyboard events. In wholesale quantities, depending on which hand my coffee cup was it when it was power cycle rebooted. If I could buy or build a usb<->spi interface, I believe that would also go away because I think its all data collisions in the internal usb that are causing the event losses.
But when its acting sicko, anywhere from one to 10 reboots will finally fix it and I've had month's of uptime's w/o this problem.
I've bought a couple rock64's, with 4 gigs of dram. Dozens of times faster than an r-pi3b. But changing the kernel to one that can run LinuxCNC, takes more knowledge of how u-boot works than I have been able to connect with. And the guys at armbian who could educate me, simply ignore my questions. I've had both jessie and now stretch installed on them, and jessie is far more stable. jessie runs great on the pi's.
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dep -
Dr. Nikolaus Klepp -
Gene Heskett