Peter
Your explanation makes perfect sense, and was my first "guess". But my
mind says such an "accumulator" must wait for process. There must be gaps
in my understanding.
Sebastian's description/explanation allows for "projection" of motion
commands by reading the g-code destinations (my question of where is this
reader remains)and letting the oscillator send pulses to the motor
drivers.
Are step and direction "pulses" present at the parallel port just ignored
in this system of "Mesa Cards and Hostmot2" ?
What system handles pulse duration and direction hold time? Is that all
in the FPGA or is EMC2 in control via the ini files?
I think I should have a look at the configuration files of a "straight"
setup, and one that uses the HostMot2 config.
I hope this is not all a bother to you.
This is helping me ! Thanks
Cal Grandy
>
>
>
> Actually much simpler, really just an accumulator that has a number (the
> step
> rate) added a high fixed rate (many MHz). When this accumulator overflows,
> a
> step is generated (this is sometimes called a DDS or a phase accumulator).
> I
> left out a few details but thats the core of the logic. Other than details
> like feedback and setup/hold times its really just a variable rate digital
> oscillator...
>
>
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