On Monday 20 February 2017 23:09:50 Erik Christiansen wrote: > On 20.02.17 22:57, TJoseph Powderly wrote: > > Thanks Erik > > my beaglebone, qubie and orangePiPlus2e cant do graphics like the > > video you posted ( heck my dm510 cant do it either ) All of those > > were candidates for linuxcnc but are now just bookshelf knickknacks. > > It is to replace my desktop machine that I ordered the Udoo X86, as > youtube etc. currently run like a dog. That the Udoo runs off 12v DC > also makes it a good candidate for running off solar power out on the > farm. > > > the video doesnt prove that an rt kernel linuxcnc image would run > > that well, but hope springs eternal. I'd think that ethernet mesa > > cards might be used as well as the weirdo pcie cable extension > > thingy. > > Yeah, maybe "instead of". While your wikipedia M.2 link refers to > "PCIe ×2" for Key-B M.2, the Udoo X86 glossy leaflet masquerading as a > datasheet: > > http://www.seco.com/misk/UDOO_X86_datasheet.pdf > > only mentions M.2 Key-B in the "Mass Storage" section. There is no > mention of PCIe in the "Other Interfaces" section. Hold on! In the > "Networks" row, there's "M.2 Key E slot", but it's possible they've > gone no further than support 'PCM "WiFi/Bluetooth cards"'. > > It is entirely likely that ethernet Mesa cards are the only way to go > with this SBC. > > > Please keep us posted on the Udoo and any experiences with linuxcnc > > on it > > tomp tjtr33 > > By the projected delivery date of end March, it'll be half a year > since my order. Let's hope it turns up then. Looking closer, it > appears that the original kickstarter subscribers haven't had anything > yet, either. On the other hand, they do say the new board design is > good to go, and production is now the last hurdle. > > I'll take a look at available ethernet Mesa cards then, assuming > there's a practical adaptor for M.2 E-key to PCIe cable. > > Erik > If perchance this magic new device has some fast gpio, and a spi driver could be written for it, the 7i90HD with spi firmware might be usable?
That spi bus protocol is a 32 bit, 4 byte packet going each way, with a 32 megabaud transfer rate in and out of a Raspberry pi 3b. Thats no slouch in the ability to do realtime control. Said another way, if the cpu power was there, one could run the servo-thread much faster than 1 kilohertz. Without the hal calculations required, an update rate of 4 megahertz for every bit of the 7i90's 72 pins of i/o could be achieved. LCNC is sitting idle out there, and the pi doesn't isolate the isolcpus=3 from being monitored by htop like it does on the x86 hardware, and the idling rtapi task is using 13.2% of cpu-3. So I can add quite a bit of processing overhead in my .hal file's yet before it actually gets "busy". Or run a servo-thread at 5 kilohertz. Yes, you'll use a pile of ferrite snapon chokes, and pay real attention to a single bolt grounding system, but once thats understood it seems to Just Work(tm). And that card is only a tad over a $60 bill on your front deck here in the USA. And its interface versatile, offering the same i/o features at the slower EPP parport rate if its a true 3.3 volt EPP port. But on the pi, the spi is only 4 signal wires not counting the 8 commons, and still faster than the parport version is. I have no clue if a true EPP parport driver has even been written for the pi's. It doesn't have one natively that I'm aware of. > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
