Inverting the PWM

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23 Dec 2016 14:36 #84615 by LS
Inverting the PWM was created by LS
I have an trivial issue with my PWM signal. When I close the LinuxCNC application, the 5i25 will return the PWM line to HIGH (pulled-up by the jumper setting). This HIGH is interpreted by my CNC-BOB as 100% spindle, and therefore fires up the spindle.

My initial thought was to invert the signal, so I soldered a 74HC14 for a quick test. Now I'm trying to configure LinuxCNC to invert its PWM output -- Is this possible? I haven't found any examples online. I also tried the invert checkbox in PncConf, but can't see any change in the config file.

I'm open to any other solutions..

Cheers.

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23 Dec 2016 15:32 #84617 by PCW
Replied by PCW on topic Inverting the PWM
Yes, you can invert any output signal by setting the invert_output parameter
of the corresponding GPIO pin, for example:

setp hm2_5i25.0.gpio.000.invert_output true
The following user(s) said Thank You: LS, Ralfh

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25 Dec 2016 01:34 - 29 Dec 2016 11:09 #84674 by LS
Replied by LS on topic Inverting the PWM
This worked. Thank you.
Last edit: 29 Dec 2016 11:09 by LS.

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