Re: Black Box - UMCI spec for API posted

Hi Steve,

Well then congratulations to Bob too! Mariss' design is a good one to
study, the only thing I remember seeing is a DDS calc for graphics.

Interesting what can be done in FPGA's (Xilinx)! I'd like to sometime
check out Verilog.

That's what I wondering about circular motion. Must be tough! In the
hardware acceleration/deceleration, is it linear, or follow a special
profile? Seems like it would have to be different for different step
modes.

Thanks for the comments!

Alan KM6VV


Steve Stallings wrote:

>
> Alan,
>
> The credit for the API document goes to Bob Shaver who works
> with me. He is also behind the software and getting our algorithm
> ideas into the Xilinx chips. My role is mostly hardware and design
> for manufacturing, and of course understanding the machine tool
> related aspects.
>
> A DDS is a rather simple concept, just a value that gets repetitively
> added to a register. The overflow of the register becomes the step
> output. Mariss has illustrated to concept quite well in this file
> posted in the files section of the Yahoo page for this group:
>
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/CIRCUITS/Pulse%20G
> en/PULSE%20GENERATOR.pdf
>
> We have been working with DDS's and precision frequency control for
> over a decade. Nowadays we end up describing them in Verilog which
> gets compiled into a Xilinx pattern. Things do get quite a bit more
> complicated when you throw in hardware management of acceleration
> and we are still fiddling with that part. Likewise, circular motion
> is a whole different problem and at present we intended to rely on
> the application program or the API to convert to short linear moves
> that get sent to the hardware.
>
> Regards,
> Steve Stallings
>
> >Hi Steve,
> >
> >Looks like you've put in considerable effort! I don't have any
> >immediate comments based on my cursory look. I find myself more on
> the
> >*OTHER END* of API's such as this; Looks like I'm going to do a
> "device"
> >for our automotive stuff at work.
> >
> >I see "linear move" in the UMCI_MOVE cmd, for up to 8 axis (!), but I
> >don't see any "circular moves"?
> >
> >Also, I'd like to hear more about the DDS you've implemented.
> >
> >I'd be most interested in the C++ interface, I'd even be interested
> in a
> >'C' interface for operation under DOS!
> >
> >Alan KM6VV
>
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