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udev rules on Raspberry Pi not working

danielb987 All Messages By This Member #241206 I have a LocoBufferUSB and a FT232 serial adapter and I need permanent links for them, for example /dev/ttyLocobufferUSB and /dev/ttyTurntable . lsusb shows: Bus 003 Device 005: ID 0403:c7d0 Future Technology Devices International, Ltd RR-CirKits LocoBuffer-USB Bus 003 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC I have tried different udev rules but I don't get any links. For example: SUBSYSTEM=="tty", ATTRS{interface}=="LocoBuffer-USB", SYMLINK+="ttyUSBLocoBuffer" SUBSYSTEM=="tty", ATTRS{interface}=="Ltd FT232 Serial (UART) IC", SYMLINK+="ttyUSBTurnTable" and ATTRS{idVendor}=="0403", ATTRS{idProduct}=="c7d0", ENV{ID_MM_CANDIDATE}="0", KERNEL=="ttyUSB" SYMLINK+="ttyLocoBuffer" ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ENV{ID_MM_CANDIDATE}="0", KERNEL=="ttyUSB" SYMLINK+="ttyTurnTable" The rules are in the file /etc/udev/rules.d/90-serial-ports.rule . I have tried both restarting the RPi and this command: sudo udevadm control --reload-rules && sudo udevadm trigger -- Daniel Bergqvist JMRI developer
Heiko Rosemann All Messages By This Member #241209 On April 9, 2025 5:32:04 AM GMT+05:30, "danielb987 via groups.io" <jmri@...> wrote: I have a LocoBufferUSB and a FT232 serial adapter and I need permanent links for them, for example /dev/ttyLocobufferUSB and /dev/ttyTurntable . lsusb shows: Bus 003 Device 005: ID 0403:c7d0 Future Technology Devices International, Ltd RR-CirKits LocoBuffer-USB Bus 003 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC I have tried different udev rules but I don't get any links. For example: SUBSYSTEM=="tty", ATTRS{interface}=="LocoBuffer-USB", SYMLINK+="ttyUSBLocoBuffer" SUBSYSTEM=="tty", ATTRS{interface}=="Ltd FT232 Serial (UART) IC", SYMLINK+="ttyUSBTurnTable" and ATTRS{idVendor}=="0403", ATTRS{idProduct}=="c7d0", ENV{ID_MM_CANDIDATE}="0", KERNEL=="ttyUSB" SYMLINK+="ttyLocoBuffer" ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ENV{ID_MM_CANDIDATE}="0", KERNEL=="ttyUSB" SYMLINK+="ttyTurnTable" The rules are in the file /etc/udev/rules.d/90-serial-ports.rule . I have tried both restarting the RPi and this command: sudo udevadm control --reload-rules && sudo udevadm trigger Hi Daniel, a few thoughts: - I've found all my udev rules include ACTION==add IIRC (not on my PC right now, can't check) or some other ACTION match - There's 'udevadm monitor' to watch the events coming in and what udev makes of them when you plug in a device - There's also 'udevadm info -a /dev/ttyUSB0' to show you all the properties of a device and its parent devices you can match against - IIRC, if you have multiple filters ending in S (SUBSYSTEMS, ATTRS etc) they need to match the same parent device Hope this points you in a good direction, Heiko -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
Dave Sand All Messages By This Member #241210 Daniel, Here is what works for me. SUBSYSTEM=="tty", SUBSYSTEMS=="usb", ATTRS{interface}=="LocoBuffer-USB", SYMLINK+="ttyUSBLocoBuffer" Dave Sand toggle quoted message Show quoted text ----- Original message ----- From: danielb987 <jmri@...> To: [email protected] Subject: [jmriusers] udev rules on Raspberry Pi not working Date: Tuesday, April 08, 2025 7:02 PM I have a LocoBufferUSB and a FT232 serial adapter and I need permanent links for them, for example /dev/ttyLocobufferUSB and /dev/ttyTurntable . lsusb shows: Bus 003 Device 005: ID 0403:c7d0 Future Technology Devices International, Ltd RR-CirKits LocoBuffer-USB Bus 003 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC I have tried different udev rules but I don't get any links. For example: SUBSYSTEM=="tty", ATTRS{interface}=="LocoBuffer-USB", SYMLINK+="ttyUSBLocoBuffer" SUBSYSTEM=="tty", ATTRS{interface}=="Ltd FT232 Serial (UART) IC", SYMLINK+="ttyUSBTurnTable" and ATTRS{idVendor}=="0403", ATTRS{idProduct}=="c7d0", ENV{ID_MM_CANDIDATE}="0", KERNEL=="ttyUSB" SYMLINK+="ttyLocoBuffer" ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ENV{ID_MM_CANDIDATE}="0", KERNEL=="ttyUSB" SYMLINK+="ttyTurnTable" The rules are in the file /etc/udev/rules.d/90-serial-ports.rule . I have tried both restarting the RPi and this command: sudo udevadm control --reload-rules && sudo udevadm trigger -- Daniel Bergqvist JMRI developer
danielb987 All Messages By This Member #241211 Dave, Thanks. The problem is that it doesn't work for me. I have the file: /etc/udev/rules.d/90-serial-ports.rule With the line: SUBSYSTEM=="tty", SUBSYSTEMS=="usb", ATTRS{interface}=="LocoBuffer-USB", SYMLINK+="ttyUSBLocoBuffer" And nothing happens. I have also tried with the line: ATTRS{idVendor}=="0403", ATTRS{idProduct}=="c7d0", KERNEL=="ttyUSB", SYMLINK+="ttyLocoBuffer" But that doesn't work either. --- Daniel Bergqvist JMRI developer 2025-04-09 04:42 skrev Dave Sand: toggle quoted message Show quoted text Daniel, Here is what works for me. SUBSYSTEM=="tty", SUBSYSTEMS=="usb", ATTRS{interface}=="LocoBuffer-USB", SYMLINK+="ttyUSBLocoBuffer" Dave Sand ----- Original message ----- From: danielb987 <jmri@...> To: [email protected] Subject: [jmriusers] udev rules on Raspberry Pi not working Date: Tuesday, April 08, 2025 7:02 PM I have a LocoBufferUSB and a FT232 serial adapter and I need permanent links for them, for example /dev/ttyLocobufferUSB and /dev/ttyTurntable . lsusb shows: Bus 003 Device 005: ID 0403:c7d0 Future Technology Devices International, Ltd RR-CirKits LocoBuffer-USB Bus 003 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC I have tried different udev rules but I don't get any links. For example: SUBSYSTEM=="tty", ATTRS{interface}=="LocoBuffer-USB", SYMLINK+="ttyUSBLocoBuffer" SUBSYSTEM=="tty", ATTRS{interface}=="Ltd FT232 Serial (UART) IC", SYMLINK+="ttyUSBTurnTable" and ATTRS{idVendor}=="0403", ATTRS{idProduct}=="c7d0", ENV{ID_MM_CANDIDATE}="0", KERNEL=="ttyUSB" SYMLINK+="ttyLocoBuffer" ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ENV{ID_MM_CANDIDATE}="0", KERNEL=="ttyUSB*" SYMLINK+="ttyTurnTable" The rules are in the file /etc/udev/rules.d/90-serial-ports.rule . I have tried both restarting the RPi and this command: sudo udevadm control --reload-rules && sudo udevadm trigger -- Daniel Bergqvist JMRI developer
david zuhn All Messages By This Member #241212 This is what I have in my /etc/udev/rules.d/90-locobuffer.rules file: SUBSYSTEM=="tty", ATTRS{product}=="LocoBuffer-USB", ATTRS{serial}=="FTNO3P86", SYMLINK+="ttyUSBLB" SUBSYSTEM=="tty", ATTRS{product}=="USB-Serial Controller D", SYMLINK+=“ttyUSBLBII" and in 91-dccex.rules: SUBSYSTEM=="tty", ATTRS{serial}=="75435353934351F0B121", SYMLINK+=“ttyUSBDCCEX" and these do the trick for my three USB command station interfaces from my pi. Your serial number is probably different. david zuhn
Steve_G All Messages By This Member #241213 .rules the ess is esmportant on the filename. ? ?
danielb987 All Messages By This Member #241224 开云体育 Steve_G, Thank you!!! I have been a developer for 30 years and I'm well aware of the need of exact syntax but I missed this one. Daniel On 2025-04-09 14:14, Steve_G via groups.io wrote: toggle quoted message Show quoted text .rules the ess is esmportant on the filename. ? ?

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