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IrDA and embedded system

Discussion in 'Electronic Design' started by [email protected], May 13, 2005.

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  1. Guest

    We have an embedded microprocessor that uses an SPI bus to connect
    to a MAX3100 UART which then connects to a MAX3120 IrDA
    transceiver/driver.

    Eventually, there will be a similar (but different, not yet
    developed) microprocessor, UART. and driver on the other end of the IR
    link.

    We're hoping to create a simple optical replacement for a two-wire
    RS-232 link. There will be no need for network protocols since only 1
    Tx/Rx will ever be able to see more than 1 other Tx/Rx.

    Since only one end of the link presently exists, we'd like to use
    an ordinary laptop with its IrDA capability to allow a program like
    Hyperterminal to substitute an IrDA port for the regular COM:x hardware
    port that it already knows how to use.

    Alternatively, would it make things simpler to get a
    serial-to-IrDA adapter like the ACTiSYS ACT-IR220L?

    Jim
     
  2. PeteS

    PeteS Guest

    From the simplicity point of view, (in my opinion), using a COTS part
    that does the serial - IrDA transfer would be better - you are not
    dealing with any real unknowns at the serial port end, although
    compatibility may raise it's head.

    My primary rule in testing is that the only unknown should be the
    hardware getting tested. In your case, replacing the serial port
    hardware introduces 2 unknowns, whereas using a COTS part reduces that.

    My suggestion would be to buy two of them, and test them from two PCs
    to make sure the link operates, then test your new stuff against that
    known working link.

    Cheers

    PeteS
     
  3. James Meyer

    James Meyer Guest

    Follow-up to my original message... Just in case you were waiting
    breathlessly for more. By the number of responses so far, one (thanks PeteS),
    my guess is that anyone waiting has already turned blue.

    We ordered and received an ACTiSYS adapter that (I hope) will do raw IR
    to serial. I haven't played with it yet.

    In the meantime, I found a program from Plushworks called Pocketerm that
    runs on any V3.0 or better Palm device. It reads my TV remote control and
    prints gibberish on the screen so it looks like it may do the job as well.

    Jim
     
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