On Wednesday 22 January 2020 03:06:38 andy pugh wrote: > On Wed, 22 Jan 2020 at 07:58, Chris Albertson <albertson.ch...@gmail.com> wrote: > > I'd say to anyone re-designing LinuxCNC to keep > > this picture on your wall. The new software shoud scale from a > > small Harbor freight mill to a light's out factory floor. > > I don't think that LinuxCNC would be a good starting point for this. > > LinuxCNC is what it is. It is a machine controller that runs on a PC. > Anything else is something else, and it probably doesn't make sense to > try to make LinuxCNC in to that thing (whatever it is) > > If you want a single system that runs your CAD and a web browser and > that also runs a CNC machine perfectly adequately then you have a > choice of LinuxCNC or Mach3, and both perform that task perfectly > adequately. > > If you want dedicated realtime hardware running the machines with an > administrative interface on a separate machine (possibly controlling > many realtime nodes) then LinuxCNC isn't really a sensible starting > point for that. > > All in my opinion of course.
I can't say as it would be ideal. OTOH, once we figure out how much bandwidth can be shoved thru an spi port, the current implementation supposedly supporting 5 channels, it does seem to me that much more complex operations than I am currently doing with one spi channel should be possible. I do think, from what I have observed on my scope, that we could use at least 4 of those channels if we could write a driver that handled 2 spi data trains in parallel, moving two 32 bit packets, to/from cards such as the 7i90HD. There is plenty of the quiet time between packets now with only one spi in use. The kernel I'm running on the rpi4 is totally crippled, its stuck in the on-demand scheduler and somehow I built it with all that write protected so I can't poke it to change it. But that rpi4b is running a 1 kilohertz servo thread without showing a single latency overflow in many hours of uptime, while only running at 850 megahertz. Huge difference between the rpi3b, and the rpi4b. I have another kernel built from the same source but have not put it on a 64G card yet. Not sure what I'm doing but I think this new kernel is locked in performance mode, at least 1.7x faster than the one currently running. 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
