nRF52840PDK Colab - no ttyACM0 on nrf USB

[Robert Link]

Hei all,

I am stuck in the colab "Build a Thread network with nRF52840 boards and OpenThread"

in step "4. Set up the RCP Joiner"

after flashing the board.

Whern changing the USB cable from debug port  to nrf USB port (and switching power source)  I get an error :

╰─$ ./ot-daemon -v 'spinel+hdlc+uart:///dev/ttyACM0?uart-baudrate=115200'
./ot-daemon[74530]: Running OPENTHREAD/thread-reference-20200818-1219-g7ba611151; POSIX; Sep 14 2021 18:13:16
./ot-daemon[74530]: Thread version: 3
./ot-daemon[74530]: [CRIT]-PLAT----: Init() at ../../src/posix/platform/hdlc_interface.cpp:151: InvalidArgument

I suppose it is because I do not see any /dev/ttyACM0 ?

The system I am using is Linux Mint.

Any idea?

thx Robert.

[je back]

I have exactly the same problem: same error message and no ttyACM* (ls /dev/ttyACM* -> No such file or directory). I have the same problem whether I use the docker image installed in the simulation codelab (worked fine) or the local build of ot-daemon.

Jan Erik

[Robert Link]

I think found the cause for that issue: all my nrf52840pdk's seem to use an pretty early version of the 52840. In the RADME.md in ~/src/ot-nrf528xx/src/nrf52840  there is following note:

"USB CDC ACM support

You can build the libraries with support for the native USB CDC ACM as a serial transport. To do so, build the firmware with the following parameter:
$ ./script/build nrf52840 USB_trans

Note that the USB CDC ACM serial transport is not supported with Engineering sample A of the nRF52840 chip."

Robert.

[je back]

I don't that explains it in my case.  I'm able to build, flash, and successfully run the zephyr USB CDS ACM composite example. When run, /dev/ttyACM0 and /dev/ttyACM1 appear and i can send information back and forth between the two just as described in the sample description.

Jan Erik

[je back]

I also tried the USB CDC ACM using NRF5 SDK (v17).  The USBD_CDC_ACM example compiled and ran as expected.

Jan Erik

[Jonathan Hui]

Ah, yes, I recommend avoiding early engineering samples of the Nordic nRF52840. Thanks for updating us on your issue.

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Jonathan Hui

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[je back]

I went through the process again and now have a dev on /dev/ttyACM0. May have been an issue with my usb cable. I still can't connect to the border router but will start a separate thread for that issue.

Jan Erik