RE: [CAD_CAM_EDM_DRO] Re: USB on Linux

Les:

Is an item such as an intelligent USB->Stepper Driver kit something that you
might consider as a side business? Perhaps add a few extra lines as
programmable I/O.

-- Jerry Jankura
Strongsville, Ohio
So many toys, So little time....

| -----Original Message-----
| From: Les Newell [mailto:les@...]
| Sent: Wednesday, October 17, 2001 1:57 AM
| To: CAD_CAM_EDM_DRO@yahoogroups.com
| Subject: Re: [CAD_CAM_EDM_DRO] Re: USB on Linux
|
|
| There are lots of microcontrollers out there that have everything
| on board,
| for less than the cost of an FPGA. However I suppose I could be considered
| biased as I spend most of my working life dealing with microcontrollers..
|
| Les
|
| >
| > That's another reason why I did my interface on the parallel port.
| > Although there is an incredibly complex protocol for intelligent devices
| > associated with IEEE-1284, you don't have to use it. I chose not
| > to incur all that overhead. I can use $6 CPLD logic chips
| (lower density
| > than a true FPGA) to handle the lower-level bus protocol and run
| > my DAC or digital I/O. For the encoder counter or stepper rate
| generator,
| > I needed to implement these more complex functions, so I put it all on
| > an $18 FPGA. With a processor, unless it is all integrated, you need
| > RAM, ROM, the peripheral function itself, the CPU, the bus interface,
| > etc.
| >
|
|
|
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