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USB-UART Problem

Former Member

Hi,

I use Xilinx SDK on Linux (Debian) and I would like see on SDK's Terminal the "Hello world". I programmed the FPGA and I connected the terminal but when I launch the program I have this message on the Terminal :
Connection canceled due to ownership request. LaunchConfiguration

Do you know why ?

Jo

  • 0

    Hi Jo,

    Have you tried using a different terminal application to see if the Linux USB-UART driver is functioning correctly and has the right ownership permissions to open the USB-UART device that is enumerated?

    Here are the steps that I use under CentOS to get USB-UART working on my ZedBoard/MicroZed/PicoZed targets with minicom:


    Install and Test Minicom Serial Terminal
    ----------------------------------------


    1)  Install minicom serial terminal.

    If prompted to allow download of packages, accept the download by pressing the Y key followed by the Enter key.

    $ sudo yum install minicom


    2)  Connect a bootable MicroZed to USB port and wait for device to boot to a terminal.


    3)  Check the kernel output log for signs that the USB-UART device has enumerated and note the ttyUSB device that is enumerated.

    $ dmesg


    4)  Create system default udev rules to give USB-UART devices sufficient permissions for development users.

    $ sudo cp /lib/udev/rules.d/50-udev-default.rules /etc/udev/rules.d/


    5)  Edit the system default udev rules with vi editor.

    $ sudo vi /etc/udev/rules.d/50-udev-default.rules


    6)  Add the following lines to 50-udev-default.rules somewhere just after the 'tty' section.

    # relax the permissions just for ttyUSB0
    KERNEL=="ttyUSB0",              MODE="0666"

    # relax the permissions just for ttyACM0 used on ZedBoard
    KERNEL=="ttyACM0",              MODE="0666"

    # prevent modem-manager from touching USB-UART device that is a target board
    SUBSYSTEM=="usb", ATTR{idVendor}=="04b4", ATTR{idProduct}=="0008", MODE="0666", GROUP="dialout", ENV{ID_MM_DEVICE_IGNORE}="1"


    7)  Save the changes to the 50-udev-default.rules file and exit vi editor.

    :wq


    8)  Add the AES_CM user to the dialout group which gives permission to access USB-UART serial tty devices.

    $ sudo usermod -a -G dialout AES_CM


    9)  Run minicom with elevated privileges so that the configuration can be modified.

    $ sudo minicom -s


    10)  Change minicom 'Serial port setup' settings and perform the following:
      A)  Set the 'Serial Device' setting to '/dev/ttyUSB0' or to match the device name from Step 3 above.
      B)  Set the 'Hardware Flow Control' setting to 'No'.
      C)  Set the 'Software Flow Control' setting to 'No'.
      D)  Save the settings by selecting the Save setup as dfl option.

     
    11)  Exit from minicom.

    12)  Run minicom in normal user mode.

    $ minicom

    If you can get something simple like minicom working, that will rule out driver and access permissions issues.

    Regards,

    -Kevin