http://linuxcnc.org/docs/html/hal/twopass.html
Cheers, Phill On 13/12/16 11:45, Gene Heskett wrote: > Greetings; > > Trying to port some of the spindle control code to the R-Pi, and it just > occurred to me that it would be much easier to organize the code into > sections that each controlled one just "device" so that all the code > having to do with spindle control was in a well marked per each devices > section. This means all that devices loadrt's, addf's and the logic that > goes with controlling the spindle was in one section, that which > controlled the X motor in its own chapter, ditto Z motor in another > chapter, home switches and limit switches in their own "chapter", and a > motion chapter, a gui chapter to load, configure and display a tach. And > a chapter to make the various interconnections needed where a signal > crosses the borders. > > I've scanned thru the Documentation but have not found that magic phrase > that enables the 500 watt lamp of understanding. Is there even an > explanation in the docs? > > ==================== > > FWIW Peter, I stuck my Hitachi 100 megahertz dual trace on 2 or 3 of > those SPI lines, at the 7i90 plug, this after adding 3 more ground > jumpers this evening, and which made zero difference and despite the > probes being 200 mhz probes, those lines are ringing like the liberty > bell, complete with its cracks. Running at a nominally 30 megabaud baud > data rate, ( pushing that scope, but its handier to use than the > sampler! ) it was also seen to be a not terribly stable bit rate, > estimated 10% time wobble at the end of the first byte sent, at the > start of a packet, a word or so after the start of a packet, and using B > delayed from A mode, with 5u-sec A at 5ns/cm B time on screen, there's > bunches of rail to rail spikes about 5ns wide that can be seen easily > just as the packet starts. > 0 > These are within the initiating start bit's /not time. > > Maybe the 26 pin IDC connectors will get here from digi-key tomorrow and > I can then make a good jumper, with 82 ohm series terminations. > > Cheers, Gene Heskett ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
