How to change PWM Frequency?

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28 Jan 2021 22:36 #196997 by roland
Replied by roland on topic How to change PWM Frequency?
I have downloaded the latest sources.
Process "Generate Programming File" completed successfully :)
Thanks for your excellent support.

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29 Jan 2021 12:35 #197050 by roland
Replied by roland on topic How to change PWM Frequency?
Now i have tried rcpwmgen. Unfortunately the frequency (rate) is also a parameter. The frequency can not be linked to a signal.


I guess it is better to look for another solenoid valve which is more suitable :)
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29 Jan 2021 13:16 #197058 by anfänger
How often and how quick do you need to change the parameter?
With halcmd setp hm2_7i92.0.rcpwmgen.rate you can change the parameter. I have some Mcodes that change parameters. But they are for gear change, so they don’t need to be realtime

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29 Jan 2021 16:11 - 29 Jan 2021 16:20 #197068 by PCW
Replied by PCW on topic How to change PWM Frequency?
Ack sorry, I relied on the idiot that wrote the manual page
section on the rcpwm...

I have changed rcpwm so it uses a pin for rate, so it matches
the manual. I can push this change, or just supply the changed
files if you are compiling LinuxCNC yourself and want to try
before I get around to pushing this change to master
Last edit: 29 Jan 2021 16:20 by PCW.

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29 Jan 2021 17:10 - 29 Jan 2021 21:46 #197074 by roland
Replied by roland on topic How to change PWM Frequency?
i have not compiled linuxcnc myself.
I am waiting for the change in master.

@anfänger
the frequency must be changed during the program execution.
The change by mcodes is good in manual mode. but not in auto mode.
Last edit: 29 Jan 2021 21:46 by roland.

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01 Feb 2021 22:30 #197338 by PCW
Replied by PCW on topic How to change PWM Frequency?
This change has been pushed to master (rcpwm rate is now a pin)

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08 Feb 2021 20:20 #198060 by roland
Replied by roland on topic How to change PWM Frequency?
i have installed master. rcpwmgen works now. (rate is a pin)
For the calculation of rate and width i wrote a hal component.
Everything works now as it should.

Will rcpwmgen also be changed in 2.8.x?

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