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Testing serial port in

  • 20-04-2006 2:00pm
    #1
    Zombrex
    Closed Accounts Posts: 25,848 ✭✭✭✭


    I'm testing a program that reads in a constant stream of data from the serial port (/dev/ttyS0).

    The problem is I'm trying to test and debug this program on a machine that has nothing connected to the serial port.

    Is there an easy way of emulating serial port input so I can send some data to this "virtual" serial port and see what my program does with it.

    I can change the port from /dev/ttyS0 if that helps (I've access to the source code)


Comments

  • #2
    niallb
    Registered Users, Registered Users 2 Posts: 2,747 ✭✭✭niallb


    Any chance the machine has two serial ports?
    A null modem cable between the two would be the most realworld option.

    If you've only one port, a USB to serial adapter for the second one will
    work fine.

    If you don't have physical access, you could look up "serial port redirector" on freshmeat, and see if anything there might suit.

    A simple solution would be to use a fifo.
    Change your sourcecode from /dev/ttyS0 to /tmp/ttyVirtual.
    mkfifo /tmp/ttyVirtual

    You can fire test data at the fifo, and the app should read it.
    You will HAVE to be able to turn off flow control to use this method.

    Test it using minicom.
    minicom -s
    Select "serial port setup", press A and enter the portname /tmp/ttyVirtual.
    press F to turn off hardware flow control if it's enabled.
    echo "Hello World" > /tmp/ttyVirtual and you'll see it in minicom.

    Hope one of those sorts you out,
    good luck,
    NiallB


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