nrf52840 Dongle will not communicate with nRF Connect for Desktop Serial Terminal on Linux

[Burt]

Hello,

I programmed the sample peripheral_uart on an nrf52840dongle_nrf52840, working in Linux and SDK v2.5.3. I had no problems using the Programmer in nRF Connect for Desktop. And I can use the programmed device with 3 out of 4 terminal emulators. I can use both Teraterm and nRF Connect Serial Terminal if I bring the dongle over to a Windows machine. On Linux, I can use the dongle with minicom with no problems. The fourth choice, using Serial Terminal on Linux, is No Go. Rest assured I closed minicom prior to starting Serial Terminal. Here is the output

16:03:15.795

Device connected with the serial number C5AC6CD37AD6588B

16:03:15.798

Auto-reconnecting to device with the serial number: C5AC6CD37AD6588B

16:03:15.798

Selecting device with the serial number C5AC6CD37AD6588B

16:03:15.798

Selected device with the serial number C5AC6CD37AD6588B

16:03:15.836

Getting serial port options from the persistent store for C5AC6CD37AD6588B.pc-nrfconnect-serial-terminal

16:03:24.293

Failed to connect to port: /dev/ttyACM1. Make sure the port is not already taken, if you are not sure, try to power cycle the device and try to connect again.

16:03:24.294

Port could not be opened. Verify it is not used by other applications.

Thanks, Burt Silverman

[Einar Thorsrud]

Hi Burt,

I have not reproduced this on my end. Are you by any chance using running minicom as root (sudo), so that it could be a matter of permissions? If so, can you make sure you add your user to the dialout and tty group? Also, it would be good to make sure you have nrf-udev installed.

If that does not work, can you let me know which Linux distro you are using?

[Burt]

Einar, thanks, you got it. I added myself to the tty group and then to the dialout group. Once I did all that communication commenced. Yes, I was using minicom as root (my bad for not mentioning that), but I was prompted explicitly to try that when I first tried minicom without being root. With Serial Terminal, the messages in red assumed I was smart!

Burt