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boards/silabs/explorer_kits/xg28/doc/xg28_ek2705a.rst

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.. zephyr:board:: xg28_ek2705a

Overview

The EFR32xG28 Explorer Kit_ is a small form factor development and evaluation platform based on the EFR32xG28 System-on-Chip_. The EFR32xG28 Explorer Kit is focused on rapid prototyping and concept creation of IoT applications for Sub-GHz and Bluetooth LE like Wi-SUN, Amazon Sidewalk, Z-Wave, Wireless M-Bus, and proprietary networks.

.. _EFR32xG28 Explorer Kit: https://www.silabs.com/development-tools/wireless/efr32xg28-explorer-kit

.. _EFR32xG28 System-on-Chip: https://www.silabs.com/wireless/z-wave/efr32zg28-z-wave-800-socs

Hardware

  • EFR32ZG28B312F1024IM48 SoC
  • CPU core: ARM Cortex®-M33 with FPU
  • Flash memory: 1024 kB
  • RAM: 256 kB
  • Transmit power: up to +10 dBm (2.4 GHz) and +14 dBm (sub-GHz)
  • Operation frequency: 2.4 GHz and sub-GHz
  • Crystals for HFXO (39 MHz) and LFXO (32.768 kHz) on the board

For more information about the xG28 SoC and Explorer Kit, refer to these documents:

  • EFR32xG28 Datasheet_
  • EFR32xG28 Reference Manual_
  • xG28-EK2705A User Guide_

.. _EFR32xG28 Datasheet: https://www.silabs.com/documents/public/data-sheets/efr32zg28-datasheet.pdf

.. _EFR32xG28 Reference Manual: https://www.silabs.com/documents/public/reference-manuals/efr32xg28-rm.pdf

.. _xG28-EK2705A User Guide: https://www.silabs.com/documents/public/user-guides/ug559-xg28-ek2705a.pdf

Supported Features

.. zephyr:board-supported-hw::

System Clock

The xG28 SoC is configured to use the HFRCODPLL oscillator at 78 MHz as the system clock, locked to the 39 MHz crystal oscillator.

Serial Port

The xG28 SoC has 1 USART and 3 EUSARTs. USART0 is connected to the board controller and is used for the console.

Programming and Debugging

.. zephyr:board-supported-runners::

Flashing

Connect the Explorer Kit to your host computer using the USB port.

Here is an example for the :zephyr:code-sample:hello_world application.

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: xg28_ek2705a :goals: flash

Open a serial terminal (minicom, putty, etc.) with the following settings:

  • Speed: 115200
  • Data: 8 bits
  • Parity: None
  • Stop bits: 1

Reset the board and you should see the following message in the terminal:

.. code-block:: console

Hello World! xg28_ek2705a

Bluetooth

To use Bluetooth functionality as well as other wireless functionality, run the command below to retrieve necessary binary blobs from the Silicon Labs HAL repository.

.. code-block:: console

west blobs fetch hal_silabs

Then build the Zephyr kernel and a Bluetooth sample with the following command. The :zephyr:code-sample:bluetooth_observer sample application is used in this example.

.. zephyr-app-commands:: :zephyr-app: samples/bluetooth/observer :board: xg28_ek2705a :goals: build