RE: [CAD_CAM_EDM_DRO] Interface options, headless boxen, and remote control ...

You might consider using the TI DSP C language compiler. In the past, I've
done some image analysis software with it and was happy with the results.
The bonus was that I could check out a lot of the code on a PC usign
Borland's complier and debugger, then move the code over to the DSP and have
it work. A much nicer situation than trying to debug on the DSP.

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


| -----Original Message-----
| From: Larry Edington [mailto:ledington@...]
| Sent: Sunday, August 19, 2001 1:05 PM
| To: CAD_CAM_EDM_DRO@yahoogroups.com
| Subject: Re: [CAD_CAM_EDM_DRO] Interface options, headless boxen, and
| remote control ...
|
|
| If it gets a DSP it will be a TI dsp. I've got several TI DSP development
| boards and a buddy that
| teaches TI DSP. While I much prefer Analog Devices DSP Assembly
| language as
| TI's Assembly looks
| like gobbledegook to me, I have more help available for the TI parts.
|
| I've just got to figure out how the DSP will fit in and be utilized.
|
| later,
| Larry E.
|
|
|
| ----- Original Message -----
| From: "Carlos Guillermo" <carlos@...>
| To: <CAD_CAM_EDM_DRO@yahoogroups.com>
| Sent: Sunday, August 19, 2001 11:46 AM
| Subject: RE: [CAD_CAM_EDM_DRO] Interface options, headless boxen,
| and remote
| control ...
|
|
| > Go for it, Larry! -
| >
| > I only have one suggestion, and that is to look at the TI
| > TMS320LC2402 for your DSP. It has lots of on-board motion control
| > capabilities for CHEAP. I think they were saying $3-4 in 1k qtys.
| > They also have a flash version for $9.
| >
| > This takes you to the TMSLC2402A:
| >
| > http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumbe
| > r=TMS320LC2402A
| >
| > This will take you to the product range page:
| >
| > http://dspvillage.ti.com/docs/catalog/misc/dspparatable.jhtml?fami
| > lyID=322&_DARGS=%2Fdspvillage%2Fdocs%2Fcatalog%2Fmisc%2Fdsppfcrumb
| > let.jhtml.3_A&_DAV=322
| >
| > HTH,
| >
| > Carlos Guillermo
| > VERVE Engineering & Design
| >
| > -----Original Message-----
| > From: Larry Edington [mailto:ledington@...]
| > Sent: Sunday, August 19, 2001 12:25 PM
| > To: CAD_CAM_EDM_DRO@yahoogroups.com
| > Subject: Re: [CAD_CAM_EDM_DRO] Interface options, headless boxen,
| > and remote control ...
| >
| > RS-422 / 485 is still a serial device. There's just so much you
| > can do with
| > a serial
| > data stream with a UART or USRT that is decoded in the PC's I/O
| > space when
| > reading
| > and writing to a device at the end of the pipe. I've designed
| > motor
| > controllers using
| > RS-485 links with microcontrollers and they work great. But it's
| > not a good
| > design
| > for a CNC control.
| >
| > I looked at microcontrollers hanging off a serial port. I even
| > built one.
| > Still it was
| > too limited by the serial pipe. Plus you have to rewrite the code
| > that's
| > already been
| > written to parse the G code and put the code to do the
| > interpolation out in
| > the micro.
| >
| > I don't care at all for the parallel port either.
| > It's greatly limited and is a kludge for CNC due to the way it was
| > designed
| > for parallel
| > printers back in the early 80's.
| >
| > A few years ago I designed an ISA card that provided a several 8
| > bit ports
| > and used a
| > 37 pin connector like the Ahha card does. It used a simple PLD for
| > address
| > decoding.
| > That was good for several axis of I/O but still was limited by the
| > 37 pin
| > connector. So
| > I added another 25 pin internal ribbon cable connector and added a
| > 25 pin
| > slot mounted
| > connector. It was still limited by the fact it was just a dumb
| > I/O port.
| > All the load is on
| > the OS and host processor.
| >
| > I've been looking at this for a few years. ISA was the way to go.
| > But those
| > days are
| > gone. ISA is a dead bus and is going away.
| >
| > Welcome to the world of PCI. There are PCI parallel multiport
| > cards that
| > could
| > be used but you are still limited when you get into 4+ axis with
| > full limit
| > switches.
| >
| > I've been kicking around the idea of designing a PCI card to do
| > CNC I/O
| > with.
| >
| > So about a month ago, I decided to commit $$$ and time to it. The
| > card will
| > be a 32 bit PCI
| > card with lots of on board memory for step buffer, timers,
| > counters, encoder
| > interfaces,
| > spindle interfaces and lots of auxillary I/O. The design has been
| > started
| > and if all goes
| > well, in a couple of months I'll have the first prototypes
| > running. I'm
| > thinking 6 axis but
| > 8 axis might make it in there. It will support steppers as well as
| > servos
| > and could even
| > be used to run steppers in closed loop mode with encoders.
| >
| > I'm also talking to a DSP guru buddy of mine about adding a DSP
| > chip to it.
| > I'm not a DSP expert but can see how an off board DSP could help
| > in some
| > of the calculations CNC requires.
| >
| > The PCI card will cable to a breakout box where all of the
| > connections to
| > the real
| > world will be. I'm kicking around the idea of an optical interface
| > to the
| > breakout box.
| > If not optical it'll be differential to the breakout box for noise
| > immunity.
| >
| > I'm going to try to do it right. My hope is to end up with an
| > interface with
| > an open API
| > that anyone that wants to can write code or drivers for that will
| > be a
| > viable interface
| > for several years to come. But one that is affordable to build.
| >
| > Linux and EMC is not my first priority. I prefer Windows. But I'm
| > sure I'll
| > find someone that
| > will be willing to write Linux drivers for it.
| >
| > If nothing else, I'll finally have the interface I have wanted for
| > years.
| >
| > later,
| > Larry E.
| >
| >
| >
| >
| > Addresses:
| > FAQ: http://www.ktmarketing.com/faq.html
| > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
| >
| > Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
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| > Moderator: jmelson@... timg@... [Moderator]
| > URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
| > bill,
| > List Manager
| >
| >
| >
| > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/

>
>

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