Hi everyone! On 04/03/2014 05:15 PM, Sebastian Kuzminsky wrote: > On 4/2/14 15:56 , Michał Geszkiewicz wrote: >> Hi Seb, > > Hi Michal, > > [... some flaming ...] > >> Additionally realtime ethernet is what could make linuxcnc project >> competitive with industrial cnc controllers. and it's only possible with >> ubc code. > > I understand, 7i80 support requires realtime ethernet, which requires > rt-preempt or xenomai. > > I'm optimistic that the LinuxCNC developer community will continue to > work on adding support for these realtime systems, and that when it's > ready we will make another release that includes this support. >
Why is rt-preempt or Xenomai required for realtime ethernet? I'm running a machine with a homebrew board connected over a realtime UDP connection for a few months now without any problems. LinuxCNC handles the user frontend (AXIS with a custom panel), G-Code processing, and so on and talks to the board through a HAL module. This module is based mainly on the code from the RT-8p8c project (https://code.google.com/p/rt-8p8c/) and therefore uses RTnet (http://www.rtnet.org/) for the underlying stuff. I'm not using RTnet's TDMA facilities but standard UDP packets, as the PC has a dedicated NIC with only a straight cable to the board (which I'd recommend anyways, do not let a switch ruin the deterministic latency). The installation is just plain (X)Ubuntu 12.04 (10.04 does work as well, but I needed some of the newer packages for other things) with the LinuxCNC installation. No custom kernel or anything like this. Anyways, I probably just talk of a different thing than you. Regards, Philipp
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