Thanks Chris! On Feb 26, 2016, at 10:46 AM, Christopher Swingley <[email protected]> wrote:
> On Fri, Feb 26, 2016 at 1:51 AM, Rick Thomas <[email protected]> wrote: >> Is there some systemd/udev/whatever way to force repeatable naming for the >> /dev/ttyUSB* devices? I'd be happy if I could get something like >> /dev/ttyUSB<pci-path> where <pci-path> is found by doing something like > > I have some systems that have multiple Arduino devices connected and > use udev rules to set up unique symlinks in /dev for each Arduino. > Run the following on a known device path: > > $ udevadm info --query=name --name=/dev/ttyUSB0 --attribute-walk > > Find unique items in this tree and add them to > /etc/udev/rules.d/59-persistent-usbserial.rules. For example: > > DRIVERS=="usb", ATTRS{manufacturer}=="Prolific Technology Inc.", > ATTRS{product}=="USB-Serial Controller", ATTRS{idProduct}=="2703", > SYMLINK+="tty_west_station" > > When I plug this device in, it gets the next /dev/ttyUSBxx device > node, but there will also be a symlink to /dev/tty_west_station that I > can use in scripts to read the data coming from that Arduino (or you > can use to connect to that particular machine). Wow! That works great! Here's what I ended up with: > # /etc/udev/rules.d/59-persistent-usbserial.rules > SUBSYSTEMS=="usb", ATTRS{serial}=="DN00K1IP", SYMLINK+="ttyUSBhalf" > > SUBSYSTEMS=="usb", ATTRS{serial}=="DN00FISA", SYMLINK+="ttyUSBcube" > > SUBSYSTEMS=="usb", ATTRS{serial}=="FTTK4M73", SYMLINK+="ttyUSBkrishna" Which works even better than I expected, because the symlink follows the client: When I unplug a client and plug it into a different USB slot, the symlink moves to the new slot... way cool! Thanks! Rick
