EMC2 running on Raspberry Pi?

Just thought I should show the breadboard setup I have done, the mcp23017 is same as on my original soldered protoboard but there is also an atmega 168 which I have been experimenting with.

I would like to install real time linux on a RPi and use it to schedule the gpio communication only. What software pieces do I need? I do not need the CNC portions of LinuxCNC, nor the HAL portion or do I to run the gpio? I just want a realtime version of raspbian with realtime gpio. Suggestions?
thanks in advance
Doc

wyzarddoc wrote:

I would like to install real time linux on a RPi and use it to schedule the gpio communication only. What software pieces do I need? I do not need the CNC portions of LinuxCNC, nor the HAL portion or do I to run the gpio? I just want a realtime version of raspbian with realtime gpio. Suggestions?
thanks in advance
Doc

see this wiki page
wiki.linuxcnc.org/cgi-bin/wiki.pl?NewRTInstall

There might be an existing GPIO-driver that works through HAL. If you code your own using xenomai real-time api/libs you don't need HAL, or even RTAPI - I think.

AW

see this wiki page
wiki.linuxcnc.org/cgi-bin/wiki.pl?NewRTInstall

There might be an existing GPIO-driver that works through HAL. If you code your own using xenomai real-time api/libs you don't need HAL, or even RTAPI - I think.

AW

there is a basic hal_gpio driver which works on the RPI in this branch. It would benefit from polishing, and speeding up.

- Michael

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

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

Regards

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

UPDATE:

Got it!

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.

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