Flipping Spindle Signal

Here is the HAL file with the Inv checkbox selected

To invert your spindlespeed set

Sadlers wrote: Here is the HAL file with the Inv checkbox selected

That seems to set which would reverse the spindle direction.

What you need is to invert the sense of the PWM pin.

Something like
But you need to work out which GPIO pin the PWM is on for this to work.

Chris,
i entered this in my custom hal file and linuxcnc will not start. Get the attached errors report. looks like I am trying to overwrite signals that have already been setup by PNCCONF. I tried handbombing the file created by PNCCONF and couldn't make it work. any suggestions?

I am controlling my spindle drive with an analog output (which generates pwm to the motor). Looking through the hal meter pins/signals I can’t locate anything that looks like an invert_output for the analog output. Do you know what this would be called?

This (modification of your hal file) should be close: