How to connect pixhawk to ubuntu with QGCS Showing 1-19 of 19 messages. Error: Open failed on port /dev/ttyACM0: OS error: Decvice or resource busy Thanks for any suggestions. Re: [px4users] How to connect pixhawk to ubuntu with QGCS. Change the permissions on your serial port. The message you got tells you which port. Works on Windows so Zumo is OK. Using Arduino IDE 1.8.5. ![]() Running Ubuntu 17.10. Added myself to the “dialout” group and rebooted: david@david-HP-ProBook-440-G2:~ ls -l /dev/ttyACM* crw-rw---- 1 root dialout 166, 0 Mar 29 13:44 /dev/ttyACM0 david@david-HP-ProBook-440-G2:~ groups david adm tty dialout cdrom sudo dip plugdev lpadmin sambashare Still get: avrdude: ser_open(): can’t open device “/dev/ttyACM0”: Permission denied Further info. Plugged in Arduino Uno, switched the board and port info in the IDE and downloaded the Blink example sketch just fine. Plugged in the Zumo, switched the board and port info in the IDE and it still gives the above error when downloading. More info: Installed the udev rules from here: Pololu A-Star software and drivers. Contribute to pololu/a-star development by creating an account on GitHub. And rebooted. Still no joy. Disabled modemmanager and rebooted. Still no joy. Thank you for posting the additional information on the problem. Can you turn on the verbose output in your Arduino IDE (if it is not already) and post the output that you get after trying to program the Zumo 32U4? You can enable verbose output by selecting File-> Atmel pro chip designer. Preferences in the IDE, and then checking the “compilation” and “upload” boxes next to “Show verbose output during:”. With the verbose output, we can check to see if the Arduino IDE is having trouble talking to the sketch’s port or with the bootloader. Don’t want to spam the forum, but I thought it might be helpful to see running avrdude directly from the command line and also a successful upload to an Arduino versus an unsuccessful upload to the Zumo. Thought that the “dmesg” output might be useful. Ran it with the “-d” option to show the delta times between lines. 670.738963 was when I first plugged in the Zumo. 725.567565 was when I clicked on upload on the Arduino IDE. The output from testport indicates that it is taking over 550 milliseconds for your system to set the mode and group for the ttyACM0 device after it is created. Based on my reading of the, it looks like the IDE only delays for about 450 milliseconds after it detects the port, so AVRDUDE is getting run before the port has usable permissions set on it, and that is why you get the “Permissoin denied” error. I ran testport on a computer from 2009 running Ubuntu 16.04, and that delay was more like 15 milliseconds instead of 550 milliseconds. Do you know why your computer might be so much slower? Did you install or configure something that does a lot of work every time a USB device is connected? Is there anything unusual in /etc/udev/udev.conf or /etc/udev/rules.d/? Have you tried any other computers?
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