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udev-rules

file names

  • rules are processed in alphabetical order
  • custom rules can be placed into /etc/udev/rules.d
  • to be considered file must ends with .rules

force an stm32 device to a specific ttyACM

  • follow create /dev/ttyACM-MY symlink to ACM0, ACM1, ... depending on match serialnr
  • to see actual parameters for a connected ttyACM0 use udevadm info -a /dev/ttyACM0
KERNEL=="ttyACM[0-9]*", SUBSYSTEM=="tty", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="374b", ATTRS{serial}=="serialnr", SYMLINK="ttyACM-MY"

detect event dev from

search in /proc/bus/input/devices and event device is in H: eventX

create symlink for serial device

# ftdi FT232
KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", SYMLINK+="ttyUSB-ft232"

# prolific PL2303
KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", ATTRS{idVendor}=="067b", ATTRS{idProduct}=="2303", SYMLINK+="ttyUSB-pl2303"

# ch340
#KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", SYMLINK+="ttyUSB-ch340"

reload udev rules

udevadm control --reload-rules ; udevadm trigger

print rules from device

udevadm info -a /dev/DEVICE