Driving a charge pump with a Mesa 5i25 stepgen

I'll try that this evening and report back.

With the stepgen.04.velocity-cmd line in the HAL file set to 0.25, I'm not getting anything between pin 16 (charge pump) and pin 18 (GND) at my breakout board.

I looked at the x-enable signal in HAL scope and that was flat-lined.

flat lined high or low?

Ack! I didn't look carefully at the hal file you posted

It has nothing setting x-enable at all (nor are any of the other stepgen axis enabled)

I would start with a pncconf created hal/ini file set,
there seems to be a lot missing from yours

The HAL file was based on one generated by pncconf (see attached for pnconf one).  I deleted out all the PID-related stuff because my system has no position feedback and the home / limit switch stuff because it doesn't have those either.  I also got rid of the "closed loop stepper signals" section for each joint, which looks like it was probably a mistake to do looking back at it now (I just saw closed loop and thought it didn't apply to my system).  Those sections look like:

# ---closedloop stepper signals---

net x-pos-cmd    <= joint.0.motor-pos-cmd
net x-vel-cmd    <= joint.0.vel-cmd
net x-output     <= [HMOT](CARD0).stepgen.00.velocity-cmd
net x-pos-fb     <= [HMOT](CARD0).stepgen.00.position-fb
net x-pos-fb     => joint.0.motor-pos-fb
net x-enable     <= joint.0.amp-enable-out
net x-enable     => [HMOT](CARD0).stepgen.00.enable

Also got rid of HALUI, coolant, probe, and toolchange sections toward the end.

But, the charge pump section still has the line

net x-enable => [HMOT](CARD0).stepgen.04.enable

So I'm not sure why that's not outputting.

Are you saying the that complete pncconf created file does not drive the chargepump? It should (though at 2500 Hz)

Your original hal file will not because x-enable is unconnected (not driven by any pin so always has the value of 0)

I would start with a pncconf created file and only change the chargepump frequency (it looks like pncconf calculates it wrong)