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1. Identifying Development Kits and Serial Ports

  1. Usenrfutil to list all connected development kits, their serial numbers and associated serial ports:

    $ nrfutil device list
1050021575
product         J-Link
board version   PCA10095
ports           /dev/ttyACM2, vcom: 0
                /dev/ttyACM3, vcom: 1
traits          devkit, jlink, seggerUsb, serialPorts, usb
1050931892
product         J-Link
board version   PCA10153
ports           /dev/ttyACM0, vcom: 0
                /dev/ttyACM1, vcom: 1
traits          boardController, devkit, jlink, modem, seggerUsb, serialPorts, usb
Found 2 supported device(s)

  2. Use nrfutil to identify the specific devices:

    $ nrfutil device device-info --serial-number 1050931892
serial_number: 001050931892
	boardVersion: PCA10153
	deviceFamily: NRF91_FAMILY
	deviceVersion: NRF9161_xxAA_REV3
	jlinkObFirmwareVersion: J-Link OB-nRF5340-NordicSemi compiled Apr 11 2024 17:44:26
	protectionStatus: NRFDL_PROTECTION_STATUS_NONE
$ nrfutil device device-info --serial-number 1050021575
serial_number: 001050021575
	boardVersion: PCA10095
	deviceFamily: NRF53_FAMILY
	deviceVersion: NRF5340_xxAA_ENGD
	jlinkObFirmwareVersion: J-Link OB-nRF5340-NordicSemi compiled Apr 11 2024 17:44:26
	protectionStatus: NRFDL_PROTECTION_STATUS_NONE

2. nRF9161-DK Serial Ports

Two USB ACM devices are detected by the Linux host when the nRF9161 DK is connected. They can be identified using nrfutil or dmesg:

$ sudo dmesg
...
[1198894.160703] usb 1-2.2: new full-speed USB device number 9 using uhci_hcd
[1198894.576542] usb 1-2.2: New USB device found, idVendor=1366, idProduct=1059, bcdDevice= 1.00
[1198894.576550] usb 1-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1198894.576553] usb 1-2.2: Product: J-Link
[1198894.576564] usb 1-2.2: Manufacturer: SEGGER
[1198894.576567] usb 1-2.2: SerialNumber: 001050931892
[1198894.589375] cdc_acm 1-2.2:1.0: ttyACM0: USB ACM device
[1198894.596846] cdc_acm 1-2.2:1.2: ttyACM1: USB ACM device
...

Connect to the nRF9161 serial console using a terminal program on your Linux PC:

picocom -b 115200 /dev/ttyACM0

3. nRF5340-DK Serial Ports

Two USB ACM devices are detected by the Linux host when nRF5340 DK is connected:

$ sudo dmesg
[1199003.499651] usb 1-2.3: new full-speed USB device number 10 using uhci_hcd
[1199003.721099] usb 1-2.3: New USB device found, idVendor=1366, idProduct=1051, bcdDevice= 1.00
[1199003.721125] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1199003.721137] usb 1-2.3: Product: J-Link
[1199003.721146] usb 1-2.3: Manufacturer: SEGGER
[1199003.721154] usb 1-2.3: SerialNumber: 001050021575
[1199003.744604] cdc_acm 1-2.3:1.0: ttyACM2: USB ACM device
[1199003.752999] cdc_acm 1-2.3:1.2: ttyACM3: USB ACM device

The interface MCU features two virtual serial ports, each with a UART interface:

  • vcom: 0 provides console interface to nRF5340 Network Core.

  • vcom: 1 provides console interface to nRF5340 Application Core.

To connect to the nRF5340 Application Core serial console using a terminal program on your Linux PC:

picocom -b 115200 <vcom: 1 port>

To connect to the nRF5340 Network Core serial console using a terminal program on your Linux PC:

picocom -b 115200 <vcom: 0 port>

4. Serial Console of the nRF9161

After the Thingy-9151-Lite application image is programmed to the target board, reset the board and observe the Zephyr banner and shell on the serial console:

*** Booting nRF Connect SDK v2.5.1-4-g0eb43b6d9219 ***
...
uart:~$

5. Serial Console of the nRF5340 Application Core

After the Thingy-9151-Lite application image is programmed to the target board, reset the board and observe the Zephyr banner and shell on the serial console:

*** Booting nRF Connect SDK v2.5.1-4-g0eb43b6d9219 ***
...
uart:~$

6. Serial Console of the nRF5340 Network Core

After the Thingy-9151-Lite application image is programmed to the target board, reset the board and observe the Zephyr banner on the serial console:

*** Booting nRF Connect SDK v2.5.1-4-g0eb43b6d9219 ***
[00:00:00.000,732] <inf> app: Start thingy9151lite_nrf5340_cpunet_app v1.2-3-debug on nrf5340dk_nrf5340_cpunet

The nRF5340 Network Core application only provides logging output to the console, as the Zephyr shell is disabled in the project configuration.

7. Zephyr Shell

Most of the standard Zephyr shell features are available, such as auto-completion, command history, etc.

Also, some generic commands are supported:

uart:~$ kernel
kernel - Kernel commands
Subcommands:
  cycles     :Kernel cycles.
  reboot     :Reboot.
  stacks     :List threads stack usage.
  threads    :List kernel threads.
  version    :Kernel version.
  sleep      :ms
  log-level  :<module name> <severity (0-4)>
uart:~$ device
device - Device commands
Subcommands:
  list  :List configured devices
uart:~$
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