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In search of processor

Discussion in 'Electronic Repair' started by [email protected], Jul 12, 2007.

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  1. Guest

    hi !
    i wanna such a processor which have following features
    i am desiging one Small Board Computer for that i need,
    1)i should port linux in that
    2)that chip should provide support to RS-232 connector.Two com ports
    it should support all 9 pins of rs connector

    Is anyone help me plz.
     
  2. I'll leave the spelling, punctuation and grammar corrections you need to
    address aside for now.

    You say you need all nine pins of the RS232 connector. Do you really need
    the RI line? You'll find it difficult to find any equipment nowadays that
    supports it anyway. Modems, the reason it's there in the first place, don't
    output it anymore anyway. That, and everyone has since worked around it by
    looking at the incoming data for the Hayes style RING line.

    If you're just using it for general I/O, I'm sure you can scrounge some
    spare pins on the CPU for that. 232 line levels are only good for longer
    distances, and there are better ways of doing that depending on your application.

    What will you be plugging into it? If it's just for comms, you can probably
    get away without the DCD line, and even if you still need handshaking, you can
    use software handshaking and not have any dramas with firmware handling unless
    you're transferring binary.

    That's four lines less. Makes your life much easier hardware wise.

    Have you really thought through what you need?
     
  3. This isn't a repair issue, find a proper place to post.

    Michel
     
  4. Eeyore

    Eeyore Guest

    The kind of processor that has the horsepower to run a full operating system
    tends not to have much in the way of on-board peripherals.

    You could use the classic 16550 UART. It'll teach you how such a port works for
    sure.
    http://www.national.com/ds/PC/PC16550D.pdf

    You'll find the equivalent integrated on many I/O chips.

    Graham
     
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