PCA 1000(1) JLINK/UART visible on Linux?

[Lionel Sacks]

Hi, I happily use the JLINK UART interface which show up as COMxx on windows for both the PCA10000 and PCA10001. We are trying to 'see' the same on Linux. Have inatlled the latest J-Link drivers, but can't see a useful /dev/tty... I've tried 'vcom enbable' in jlinkexe... is there something else to do?

thanks.

[Håkon Alseth]

Hi,

Under linux, the device will enumerate as a "USB modem" (a subclass of USB CDC), and it should be accessible under /dev/ttyACMx, where x is normally 0 unless you have more of this specific usb class connected to your PC. To see if the enumeration is successful, you can do something like this:

dmesg | grep SEGGER

It should post something similar to this:

[   28.805067] usb 1-2: Manufacturer: SEGGER

Note that you may have to be root in order to access the com-port, depending on how your distro is setup. I used "putty" to setup the serial communication.

Also be sure to read the JLink readme file. You may have to add a udev rule, depending on your system.

Cheers, Håkon

[Yngve Halmø]

I get the following output in syslog when I connect the USB device:

Oct 29 08:15:53 jobbox ModemManager[862]: Could not grab port (tty/ttyACM0): 'Cannot add port 'tty/ttyACM0', unhandled serial type' Oct 29 08:15:53 jobbox ModemManager[862]: Couldn't create modem for device at '/sys/devices/pci0000:00/0000:00:1c.6/0000:0f:00.0/usb3/3-2': Failed to find primary AT port

Any idea what the problem is?

(I am using ubuntu 14.04 x64)

[Håkon Alseth]

Did you add the udev rules for jlink? Should be a 99-jlink.rules that you need to copy into /etc/udev/rules.d/

[Yngve Halmø]

It was installed automatically by the jlink debian package. So it's there. But I don't if the rules are correct/work as intended.

[Yngve Halmø]

Actually, by some stroke of magic, I'm now getting data out from ttyACM0 despite the error. I guess I have to figure out a way to talk to the modem then, instead of a USB device. If anyone has any ideas that would be helpful, but that's not a Nordic problem. Cheers.