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Any Velleman K8048 Users out there?

Discussion in 'Electronic Design' started by Andy Bateman, Dec 10, 2005.

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  1. Andy Bateman

    Andy Bateman Guest

    I've just bought a Velleman K8048 from Maplin which I think is just what
    I want.

    Problem is I built it, lights flash, fantastic. But I can't program with
    it, I'm using a USB -> Serial Adaptor on my laptop, a straight through
    cable to the board. The software doesn't see the board, even without a
    cable plugged into the board 'LD8' the read/write LED lights up, is this
    normal?

    I've plugged a previously programmed 16F84A (With a home made
    programmer) into the board and it works fine for running through other
    programs I wrote.

    Anyone have any experience with this?

    Cheers!
     
  2. Rich Webb

    Rich Webb Guest

    (USB to serial adapter) != (PC serial port)

    Your best bet is to exhume an older PC that has "real" serial (and
    parallel) ports and use it to drive the programmer.

    See the thread at http://forum.microchip.com/tm.asp?m=75873 that implies
    that the Velleman doesn't use the serial port as a simple "RS-232"
    device but does some jiggering with the port signals.
     
  3. Andy Bateman

    Andy Bateman Guest

    Yeh.. That was the answer i was expecting, any thoughts on the
    read/write light always being lit in prog mode?
     
  4. scada

    scada Guest

    My guess would be still getting garbage from the USB-Serial device. Have you
    considered a PCI to serial board?
     
  5. scada

    scada Guest

    Ooops! You did say laptop. Maybe you can find a PCMCIA to serial card?
     
  6. Rich Webb

    Rich Webb Guest

    Not other than it's not getting tickled in the way that it's expecting.
    You might try a logic analyzer to see what's really happening on the
    programmer side of the interface but that doesn't do more for you than
    show why it's not working. If the software API isn't cooperating, you're
    basically screwed (unless you're up to writing your own).

    I've heard rumors of USB-to-RS232 converters that behave properly but I
    don't know of any by brand/model. I don't think that there should be any
    technical reason why one couldn't be designed to be accessible to
    non-standard manipulation but I suspect that the marketplace drives the
    commodity market towards the least expensive, simplest behavior; e.g.,
    bog-standard RS-232 and nothing else. Device APIs that expect to be able
    to access the 16550 UART registers are likely to be disappointed.
     
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