EMC2 running on Raspberry Pi?

wyzarddoc
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13 years 9 months ago #28727 by wyzarddoc

Replied by wyzarddoc on topic EMC2 running on Raspberry Pi?

Thanks so much for the link. I'll check it out.

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kinsa
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13 years 9 months ago #28849 by kinsa

Replied by kinsa on topic EMC2 running on Raspberry Pi?

Did anyone got to compile linuxcnc for the ARM platform besides the simulator mode?

Regards

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ArcEye
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13 years 9 months ago #28909 by ArcEye

Replied by ArcEye on topic EMC2 running on Raspberry Pi?

All the discussion etc is on the developers list

sourceforge.net/mailarchive/forum.php?forum_name=emc-developers

I think they dropped the RPi as being too low powered to make a realistic platform, but there was quite a lot of work on the Beagelbone.

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kinsa
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13 years 9 months ago #28912 by kinsa

Replied by kinsa on topic EMC2 running on Raspberry Pi?

I haven't found the instructions to compile under Beaglebone either. Only the simulator mode.

UPDATE:

Got it!

Code:

./configure --with-platform=beaglebone/raspberry

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kinsa
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13 years 9 months ago #29066 by kinsa

Replied by kinsa on topic EMC2 running on Raspberry Pi?

ArcEye wrote: All the discussion etc is on the developers list

sourceforge.net/mailarchive/forum.php?forum_name=emc-developers

I think they dropped the RPi as being too low powered to make a realistic platform, but there was quite a lot of work on the Beagelbone.

I've got it running under Xenomai. Initial results seems good but not suitable for sw stepgen. I'm planning to pair this with a low cost FPGA board and see how it goes.

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mhaberler
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13 years 9 months ago #29068 by mhaberler

Replied by mhaberler on topic EMC2 running on Raspberry Pi?

To build for Xenomai, 2 conditions must hold:

- the Rpi must be running a Xenomai kernel
- the Xenomai userland support package must be installed ( git.xenomai.org/?p=xenomai-2.6.git;a=summary )

configure.log will tell how that detection goes.

As far as I am concerned, the raspberry platform option will stay in the code, but I will not put any effort into packaging or usability; if somebody else does, I'm happy to integrate patches.

- Michael

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kinsa
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13 years 8 months ago #30003 by kinsa

Replied by kinsa on topic EMC2 running on Raspberry Pi?

Just an update, I was able to offload the base thread to an external PIC micro using SPI.

My observation is that bit-banging an 8 bit data bus is not optimal. The RPi SPI has 64 bytes of buffer so transferring data is quick with minimal cpu overhead.

I'm currently running the SPI clock at 15 MHz, a 64 bytes transfer completes in around 45 us. The maximum SPI speed that the RPi can operate at is 31 MHz. This is too fast for a PIC but doable with an FPGA.

Cheers!

UDPATE:

I finished porting my rt-8p8c code to the new PIC micro.

It's currently running using the mini tk interface over ssh.

Here is the output of top with backplot enabled:

Code:

top - 10:48:06 up  9:58,  2 users,  load average: 0.53, 0.60, 0.56
Tasks:  59 total,   1 running,  58 sleeping,   0 stopped,   0 zombie
%Cpu(s): 38.7 us,  6.6 sy,  0.0 ni, 53.1 id,  0.0 wa,  0.0 hi,  1.6 si,  0.0 st
KiB Mem:    498864 total,   204120 used,   294744 free,    21304 buffers
KiB Swap:        0 total,        0 used,        0 free,   117996 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND           
root      20   0 29216  12m 4936 S  35.2  2.6   8:51.26 wish8.5           
root      20   0 11548 5224 4520 S   5.2  1.0   2:00.87 milltask          
root      20   0 10496 3368 2360 S   3.9  0.7   1:29.53 sshd              
root      20   0 30040  11m 6144 S   2.9  2.4   0:47.77 hal_manualtoolc   
root      20   0  4620 1340 1024 R   1.3  0.3   0:10.15 top               
root      20   0  9504 3092 2364 S   0.3  0.6   0:29.58 sshd              
root      20   0  4128 1728 1440 S   0.3  0.3   0:03.32 io                
root      20   0  2104  712  612 S   0.0  0.1   0:02.03 init              
root      20   0     0    0    0 S   0.0  0.0   0:00.00 kthreadd          
root      20   0     0    0    0 S   0.0  0.0   0:00.02 ksoftirqd/0       
root      20   0     0    0    0 S   0.0  0.0   0:04.17 kworker/u:0       
root      -2   0     0    0    0 S   0.0  0.0   0:02.12 rcu_kthread       
root       0 -20     0    0    0 S   0.0  0.0   0:00.00 khelper           
root      20   0     0    0    0 S   0.0  0.0   0:00.00 kdevtmpfs         
root       0 -20     0    0    0 S   0.0  0.0   0:00.00 netns             
root      20   0     0    0    0 S   0.0  0.0   0:00.23 sync_supers       
root      20   0     0    0    0 S   0.0  0.0   0:00.00 bdi-default

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kinsa
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13 years 8 months ago #30090 by kinsa

Replied by kinsa on topic EMC2 running on Raspberry Pi?

I have created a wiki page: wiki.linuxcnc.org/cgi-bin/wiki.pl?RaspbianXenomaiBuild documenting the steps I took to create a working Xenomai LinuxCNC image for RPi.

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JZHA1985
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13 years 8 months ago #30096 by JZHA1985

Replied by JZHA1985 on topic EMC2 running on Raspberry Pi?

A kickstarter if/when things come together would be nice, although I know that's far from a simple ordeal.

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mhaberler
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13 years 8 months ago #30098 by mhaberler

Replied by mhaberler on topic EMC2 running on Raspberry Pi?

It is possible to run LinuxCNC on the Rasberry - in principle. It compiles, and runs on a Xenomai kernel.

that said, be advised that at least with Axis, the Pi runs out of CPU cycles badly - you might want to adjust your expectations downwards a bit.

- Michael

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