On Tue, 7 Feb 2017, Curtis Dutton wrote: > Date: Tue, 7 Feb 2017 15:28:26 -0500 > From: Curtis Dutton <curtd...@gmail.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] calling hm2_<BoardType>.<BoardNum>.write + > hm2_<BoardType>.<BoardNum>.read at higher rates > > Ok I did try using the read_gpio and write_gpio. > > The raster component reads the stepgen-fb position and then updates its > output power based up on that, which is wired to a pwmgen. > > Would read_gpio and write_gpio affect the pwmgen output?
It should not but that stuff is so seldom used that it may have bitrotted > > On Tue, Feb 7, 2017 at 1:43 PM, Peter C. Wallace <p...@mesanet.com> wrote: > >>> >>> 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 >> > ------------------------------------------------------------------------------ > 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
