Actions
Forum Thread Details
  • Replies 13 replies
  • Subscribers 508 subscribers
  • Views 2147 views
  • Users 0 members are here
Related

udev rules error on BBB

ramanc51

Hi all

             In my BBB i written udev rule 99-usb-serial.rules at /etc/udev/rules.d to fix my usb-serial converter ttyUSB0 name as static(e.g printer), but this rules not create symlink as i given below, alos i saw error that unable to open '/sys/udev/ttyUSB0', is there glue to resolve this error?

 

my 99-usb-serial.rules

 

SUBSYSTEMS=="usb-serial", MODE="0666", ATTR{idVendor}=="0403", ATTR{idProduct}=="6001", SYMLINK+="printer"

 

Error

parse_file: reading '/etc/udev/rules.d/99-usb-serial.rules' as rules file

udev_rules_new: rules use 197880 bytes tokens (16490 * 12 bytes), 32369 bytes buffer

udev_rules_new: temporary index used 60680 bytes (3034 * 20 bytes)

unable to open device '/sys/dev/ttyUSB0'

debian@beaglebone:~$

 

Note:

        But i am able to open this device as /dev/ttyUSB0 only by my another java application on same BBB, but not as a printer

Parents Reply Children
  • in reply to bwelsby

    I found my device SUBSYSTEM = "usb" , now it creates symlink at /etc/dev as expected, but my app is not able to open the device using symlink name

    For e.g i used to open printer comport  as follows

     

    /dev/printer   -  //dev/printer -> /dev/ttyUSB0

    /dev/display  - //dev/display -> /dev/ttyUSB1

     

    it says no such port, please share  how to use symlink name to open/close ports

  • in reply to ramanc51

    ok so if you

    ls -l /dev/printer

    you get something like

    lrwxrwxrwx 1 root root 7 Feb 20 09:19 /dev/printer -> ttyUSB0

     

    you should be able to just use /dev/printer in just the same way you would use /dev/ttyUSB0

     

    If you have something like minicom installed then

    minicom -D /dev/printer

    should open a terminal session with the port

     

    please can you post the output for

    udevadm info /dev/ttyUSB0