Date: Sat, 17 Jan 2015 18:34:50 +0200
Reply-To: "Enhanced Machine Controller (EMC)"
Subject: Re: [Emc-users] MESA 7i87 support
Post by Peter C. Wallaceall sserial remotes work with linuxcnc
Great. Thanks!
BTW what is possible software PWM frequency on GPIO outputs on 7i76, 7i77?
pretty slow since they are only updated at the servo thread rate (say 1 to 5
KHz)
On the 7I76, If you need PWM and you are not using all 5 step/dir pairs, you
can use the step/dir outputs and a custom config that includes hardware PWM
generators wired to these pins.
Also if PFM (Pulse frequency modulation) will work you can get that out of a
stepgen directly (set the step length to say 10 usec, the step space to 0
and use the stepgen in velocity mode) now setting the velocity from 0 to 100
KHz will give you 0 to 100 % duty cycle
You can also use the serial exapnsion port on the 7I76 or 7I77 for PWM out
if one channel is enough (thsi requires a custom configuration)
--
Andrew
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Peter Wallace
Mesa Electronics
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