On Thursday 22 November 2018 06:17:47 andy pugh wrote: > On Thu, 22 Nov 2018 at 02:27, Gene Heskett <ghesk...@shentel.net> > wrote: > > But I'm seeing a problem, the 7i76 has no pwm/pdm outputs, driving an > > > analog signal suitable for a vfd, but I need the pwm/pdm to drive my > > lashup, one of Jon's pwm-servo amps for spindle control. > > It should be possible to put a PWM on one of the step channels, if you > don't need all of them. > (This will need a custom firmware)
Thats what I'm afraid of. With the 7i76, I'll have all the stepgens I need with one to spare, and since the 7i78 also has the isolated vfd driver, I am wondering if p2 has the pwm/pdm signal if the 5i25 has the 7i76-7i78 firmware in it, and a normal breakout is plugged onto 5i25/p2 instead of the 7i78. This would work UNLESS the com from p2 is also on SPI. I messaged PCW last night, but its a holiday here in the US today, so I don't expect a reply till Friday. Thinking about my softstart of the motor psu, so as not to trip sick bird circuit breakers, I can think of several ways to skin that cat, but getting a digital pdm out of this combo doesn't seem to be possible w/o a 2nd 5i25. That may wind up being the solution yet. But I just got told I may as well start the dinner I've planned. Thanks Andy. -- 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
