EFR32BG22 Explorer Kit (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:

Supported Features

The bg22_ek4108a board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

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

The bg22_ek4108a board supports the runners and associated west commands listed below.

flash debug

Note

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

Flashing

The sample application Hello World is used for this example. Build the Zephyr kernel and application:

# From the root of the zephyr repository
west build -b bg22_ek4108a samples/hello_world

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:

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.

west blobs fetch hal_silabs

Then build the Zephyr kernel and a Bluetooth sample with the following command. The Observer sample application is used in this example.

# From the root of the zephyr repository
west build -b bg22_ek4108a samples/bluetooth/observer