.. zephyr:board:: bg22_ek4108a

Overview

The EFR32BG22 Explorer Kit (BG22-EK4108A) contains a Wireless System-On-Chip from the EFR32BG22 family built on an ARM Cortex®-M33 processor with excellent low power capabilities.

Hardware

EFR32BG22C224F512IM40 Mighty Gecko SoC
CPU core: ARM Cortex®-M33 with FPU
Flash memory: 512 kB
RAM: 32 kB
Transmit power: up to +6 dBm
Operation frequency: 2.4 GHz
Crystal for HFXO (38.4 MHz)

For more information about the EFR32BG22 SoC and BRD4108A board, refer to these documents:

EFR32BG22 Website_
EFR32BG22 Datasheet_
EFR32xG22 Reference Manual_
BRD4108A User Guide_

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

In the following table, the column Name contains Pin names. For example, PA2 means Pin number 2 on PORTA, as used in the board's datasheets and manuals.

+-------+-------------+-------------------------------------+ | Name | Function | Usage | +=======+=============+=====================================+ | PA4 | GPIO | LED0 | +-------+-------------+-------------------------------------+ | PC7 | GPIO | Push Button 0 | +-------+-------------+-------------------------------------+ | PA5 | USART1_TX | UART Console VCOM_TX US0_TX | +-------+-------------+-------------------------------------+ | PA6 | USART1_RX | UART Console VCOM_RX US0_RX | +-------+-------------+-------------------------------------+

System Clock

The EFR32BG22 SoC is configured to use the 38.4 MHz external oscillator on the board, and can operate a clock speeds of up to 76.8 MHz.

Serial Port

The EFR32BG22 SoC has two USARTs and one EUART. USART1 is connected to the board controller and is used for the console.

Programming and Debugging

.. zephyr:board-supported-runners::

.. note:: Before using the kit the first time, you should update the J-Link firmware in Simplicity Studio.

Flashing

The sample application :zephyr:code-sample:hello_world is used for this example. Build the Zephyr kernel and application:

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: bg22_ek4108a :goals: build

Connect the bg22_ek4108a to your host computer using the USB port and you should see a USB connection.

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'll see the following message on the corresponding serial port terminal session:

.. code-block:: console

Hello World! bg22_ek4108a/efr32bg22c224f512im40

Bluetooth

To use the BLE function, run the command below to retrieve necessary binary blobs from the SiLabs 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: bg22_ek4108a :goals: build

.. _EFR32BG22 Website: https://www.silabs.com/wireless/bluetooth/efr32bg22-series-2-socs#

.. _EFR32BG22 Datasheet: https://www.silabs.com/documents/public/data-sheets/efr32bg22-datasheet.pdf

.. _EFR32xG22 Reference Manual: https://www.silabs.com/documents/public/reference-manuals/efr32xg22-rm.pdf

.. _BRD4108A User Guide: https://www.silabs.com/documents/public/user-guides/ug509-bg22-ek4108a.pdf