On Tuesday 25 October 2016 08:25:14 Todd Zuercher wrote: > About 4-5kHz in a floating point base-thread was about as fast as I > was able to get the read/writes for my Mesa 5i25/7i77 combo to run at. > There might be tricks to get it a little faster but I doubt there is > a lot more to be gained with that combo. Smart serial communication > seemed to be the limiting factor.
On a 5i25, on a dual core @1.4Ghz atom powered D525MW mobo, 4 kilohertz was making the rest of the machine a bit sleepy. On an: Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz with a 5i25 in it, 4 kilohertz didn't phase the rest of the machine. > ----- Original Message ----- > From: "andy pugh" <bodge...@gmail.com> > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> Sent: Tuesday, October 25, 2016 > 6:30:00 AM > Subject: Re: [Emc-users] LinuxCNC laser cutter? > > On 25 October 2016 at 09:48, Les Newell <les.new...@fastmail.co.uk> wrote: > > Is there any reason why the realtime part of the raster component > > can't run in a faster thread, say 10kHz? As long as you have > > hardware PWM (e.g Mesa FPGA) you should be able to get pretty good > > resolution. > > Generally the Mesa update functions run in the servo thread because > there is a fair bit of floating-point maths involved in PWM duty cycle > calculations. > It is possible to enable floating-point in a base thread, but I > suspect that the Mesa update function might be a bit "expensive" to > run at 10kHz. 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ The Command Line: Reinvented for Modern Developers Did the resurgence of CLI tooling catch you by surprise? Reconnect with the command line and become more productive. Learn the new .NET and ASP.NET CLI. Get your free copy! http://sdm.link/telerik _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
