> > As part of my laser engraver implementation that I have been working on, I > have a raster component that needs to vary the pwmgen output at higher rate > than the servo period. > > The math I'm using to determine the speed is the scan speed. So for > instance a 6000mm/min scan speed, with an update rate of 1Khz gives me a > resolution of about 0.1mm. Thus 10Khz will give me 0.01mm resolution at > that speed, and allows me to bump up the speed without losing resolution. > > 6000 / 60 / 1000 = 0.1mm > > > > For me a base-thread at about 100000 ns will work. So the idea I had was to > put my raster components and the hostmot2 stepgens and pwmgen update > functions to run on the base thread, while normal motion work still occurs > on the servo thread.
AFAIK if you have multiple threads, you can only manipulate GPIO at the base thread rate using the hm2_<BoardType>.<BoardNum>.read_gpio and hm2_<BoardType>.<BoardNum>.write_gpio functions Also this only works on PCI interfaced cards (not EPP,SPI,Ethernet) The proper way to do this is probably with motion synchronized data painting firmware/driver/interpreter changes > > I was able to set up the hal properly and assign the write and read methods > to the base thread. > > Now though the steppers now aren't operating properly. When operating they > are jerky and louder. They seem to want to run in one direction but seize > up when running in the other direction. > > I'm not sure where to start to debug this. Any tips are welcome. > > > Thanks! > ------------------------------------------------------------------------------ > 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 > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ 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
