Confusion-please enlighten

I made the assumption that the left side or the "=" of the "=>" indicated the origin of the signal or connections "black box" and the right side, the ">" the destination.

I thought that the expression:

net emcmot.00.enable <= axis.0.amp-enable-out
net emcmot.00.enable => hm2_[HOSTMOT2](BOARD).0.stepgen.00.enable

meant that (axis.0.amp-enable-out) was joined with or became (emcmot.00.enable) which was joined with or became (hm2_[HOSTMOT2](BOARD).0.stepgen.00.enable)
(stepgen.00.enable) corresponding to the StepGen 0 pins from the 5i25pinout.txt


IO Connections for P3
Pin# I/O Pri. func Sec. func Chan Pin func Pin Dir

1 0 IOPort None
14 1 IOPort PWM 0 PWM (Out)
2 2 IOPort StepGen 0 Step/Table1 (Out)
15 3 IOPort None
3 4 IOPort StepGen 0 Dir/Table2 (Out)

Understanding the semantics the terminology and how these are parsed or interpreted is not an insignificant task and least for me. Thanks for your patience

bill a

The statements roughly mean:

create signal emcmot.00.enable if it does not exist
connect pin axis.0.amp-enable-out to wire (signal) emcmot.00.enable

connect signal emcmot.00.enable to pin hm2_[HOSTMOT2](BOARD).0.stepgen.00.enable

Note that pin order (like the <= => and <=> symbols) is unimportant
you can replace the above two statements with:
or

They are all exactly the same functionally

Does the (hm2_[HOSTMOT2](BOARD).0.stepgen.00.enable) correspond then to the
StepGen 0 pins from the 5i25pinout.txt

Yes its the enable for stepgen 0

Hallelujah, a little thinning of the clouds.

would that also mean that the following would be the positioning pulses?
net emcmot.00.pos-cmd <= axis.0.motor-pos-cmd
net emcmot.00.pos-cmd => hm2_[HOSTMOT2](BOARD).0.stepgen.00.position-cmd

That is the position command in machine units, the actual step pulses are not visible in hal in any useful way

I can see that there are a number of signals required to generate the outputs and I guess that I'll just have to experiment to see what does what. A picture is worth a thousand words and I surmise that since this circuit handles far more than open loop step and direction there are probably feedback signals that I won't need.

thanks for the insights
bill a.

You dont really need to experiment unless you want to, any of the sample hm2-stepper configurations or a pncconf generated sample configuration have the correct HAL "wiring" for a hardware stepgen