2015-01-17 19:06 GMT+02:00 Peter C. Wallace <[email protected] <https://mail.google.com/mail/u/0/?view=cm&fs=1&tf=1&[email protected]>>: > > > > 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)
Thanks. I'm thinking about extruder and heatbed PWM so even 1Hz might be enough, right? What I did not think is PFM, it's a simple solution when stepgen is available. -- Andrew ------------------------------------------------------------------------------ New Year. New Location. New Benefits. New Data Center in Ashburn, VA. GigeNET is offering a free month of service with a new server in Ashburn. Choose from 2 high performing configs, both with 100TB of bandwidth. Higher redundancy.Lower latency.Increased capacity.Completely compliant. http://p.sf.net/sfu/gigenet _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
