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Using Serial Console and Zephyr Shell

Using Serial Console and Zephyr Shell

Owned by Alexander Dyachenko
Last updated: Feb 26, 2025 by Dmitry Starchenko
2 min read

1. Overview

This note describes how to set up and use the serial console for the SOM-NRF9151 board. Use of the Zephyr interactive shell command interface, on top of the serial consoles, is explained as well.

2. Setting Up Serial Consoles

After the board is connected to your Linux PC, use dmesg to identify the board serial port:

$ sudo dmesg ... [7356251.975352] usb 3-7.2: new full-speed USB device number 17 using xhci_hcd [7356252.071980] usb 3-7.2: New USB device found, idVendor=0403, idProduct=6001, bcdDevice= 6.00 [7356252.072000] usb 3-7.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [7356252.072007] usb 3-7.2: Product: FT232R USB UART [7356252.072012] usb 3-7.2: Manufacturer: FTDI [7356252.072017] usb 3-7.2: SerialNumber: B002LIR7 [7356252.082000] ftdi_sio 3-7.2:1.0: FTDI USB Serial Device converter detected [7356252.082102] usb 3-7.2: Detected FT232R [7356252.085252] usb 3-7.2: FTDI USB Serial Device converter now attached to ttyUSB0 ...

Connect to it using a terminal program on your Linux PC:

picocom -b 115200 /dev/ttyUSB0

After the 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 v2.8.0-e3db2104b81d *** *** Using Zephyr OS v3.7.99-78e3b9740208 *** ... uart:~$

3. Using Zephyr Shell

The SOM-NRF9151 software is configured to run the Zephyr interactive shell command interface in the serial console.

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

Various Zephyr shell commands are enabled:

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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