Hmmm, is there a topic-obfuscating-campaign going on?
On 2016-02-03 01:24, W. Martinjak wrote: > How far is the development of lcnc on raspi/arm? > Would this [1] work with bare lcnc installation. > > [1](the last three messages) > https://groups.google.com/forum/#!msg/machinekit/cjRA3OFtTIM/rZQ21QfCAwAJ > > > On 2016-02-02 23:29, Ralph Stirling wrote: >> Nicklas, >> >> There is a fork of LinuxCNC called Machinekit. The Machinekit developers >> have the system running on BeagleBoneBlack sbc's and RaspberryPi2's. >> They also have the real-time portions running on FPGA's. One effort >> involves using System-On-Chip FPGAs, which include ARM processor cores. >> The real-time activity is implemented directly in FPGA hardware, and the >> non-real-time actions run under Linux on the ARM core. If you are interested >> in CNC on microcontrollers, you should go check out Machinekit. >> >> -- Ralph >> ________________________________________ >> From: Nicklas Karlsson [[email protected]] >> Sent: Tuesday, February 02, 2016 1:27 PM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Prempt RT --> RTAI, Xenomai, delay >> >>> ... >>> That's because NOBODY (manufacturers or distributors) wants to futz with >>> testing motherboard latencies, problems with their obsolescence, IO >>> boards, controllers, USB issues, etc. All that is a big concern to >>> anybody who wants to see LinuxCNC as part of their business. >> Preempt RT do not manage priorities properly for interrupts while RTAI and >> Xenomai do. It is rather simple, execution time to service an interupt every >> now and then will delay real time tasks with as much time as they take to >> execute. Then there are SMI which will interrupt anyway. I run control loop >> at micro controller at 40kHz and it works perfect because it allow nested >> interrupts with priority. >> >>> ... >>> In addition, I believe that linuxCNC needs to be split into two parts >>> and "sold as such" by default: >>> - headless LinuxCNC with hard RT kernel to run on different SBCs to >>> handle all CNC IO >> There are cheap development board with micro controllers available. Most of >> them use some kind of Cortex-* CPU with an NVIC for nested interrupts with >> priority which is really great for real time even though they have a lot >> less computing power avaiable than an ordinary computer. >> >> I would suggest to investigate possibility to separate code so that the real >> time tasks could be run on an micro controller. There also development >> boards available with extra ram so that they can run Linux, maybe even X11 >> would be possible. >> >>> - GUI frontend, local or remote, connected to Linux workstation or >>> modern tablet over USB, ethernet, or WiFi. Countless digital tablets can >>> be had for under $100 that could serve as CNC UI. >> GUI could stay on ordinary computer while real time taska move to cortex-* >> micro controller, they talk via TCP/IP and maybe even X11. >> >>> ... >> Nicklas Karlsson >> >> ------------------------------------------------------------------------------ >> Site24x7 APM Insight: Get Deep Visibility into Application Performance >> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month >> Monitor end-to-end web transactions and take corrective actions now >> Troubleshoot faster and improve end-user experience. Signup Now! >> http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> ------------------------------------------------------------------------------ >> Site24x7 APM Insight: Get Deep Visibility into Application Performance >> APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month >> Monitor end-to-end web transactions and take corrective actions now >> Troubleshoot faster and improve end-user experience. Signup Now! >> http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users -- "In der Wissenschaft siegt nie eine neue Theorie, nur ihre Gegner sterben nach und nach" Max Planck ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
