On 1/9/2014 1:32 PM, Mark Tucker wrote: > I am currently thinking of switching to the BBB And Machinekit to run my cnc > Router. > But the first snag seems to be the Step pulse and no way of inverting it? > I am using Gecko 201s on all 3 axis which require The step pulse to be active > low (Pulse on high to low transition) > Whilst i realise this seems to be coded in the PRU,How hard is it to change?
Not terribly hard. Just inverting the pulse for all step outputs would mean changing a couple lines of code (very easy). Making the pulse polarity configurable would require a bit more work. I've got a collection of PRU work I need tackle soon, including adding a software encoder input (for a jog-wheel and for Michael Haberler's pet project) and a bunch of general cleanup to make pin numbering consistent (so I can begin documenting things). I'll see if I can't tackle your step polarity issue while I'm making the other changes. What sort of time-frame are you working with? -- Charles Steinkuehler char...@steinkuehler.net
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