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boards: silabs: Add support for Silabs EFR32ZG28 BRD4401C board
Add support for Silicon Labs BRD4401C (a.k.a xG28-RB4401C) Radio Board. Author: shontal1005 <shontal1005@gmail.com>
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‎boards/silabs/radio_boards/xg28_rb4401c/Kconfig.defconfig

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# Copyright (c) 2025 Shontal Biton
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# SPDX-License-Identifier: Apache-2.0
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if BOARD_XG28_RB4401C
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config LOG_BACKEND_SWO_FREQ_HZ
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default 875000
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depends on LOG_BACKEND_SWO
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if SOC_GECKO_USE_RAIL
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config FPU
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default y
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endif # SOC_GECKO_USE_RAIL
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endif # BOARD_XG28_RB4401C

‎boards/silabs/radio_boards/xg28_rb4401c/Kconfig.xg28_rb4401c

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# Copyright (c) 2025 Shontal Biton
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# SPDX-License-Identifier: Apache-2.0
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config BOARD_XG28_RB4401C
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select SOC_PART_NUMBER_EFR32ZG28B322F1024IM68

‎boards/silabs/radio_boards/xg28_rb4401c/board.cmake

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# SPDX-License-Identifier: Apache-2.0
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board_runner_args(jlink "--device=EFR32ZG28BxxxF1024")
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include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)
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board_runner_args(openocd)
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include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)
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board_runner_args(silabs_commander "--device=EFR32ZG28B322F1024IM68")
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include(${ZEPHYR_BASE}/boards/common/silabs_commander.board.cmake)

‎boards/silabs/radio_boards/xg28_rb4401c/board.yml

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board:
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name: xg28_rb4401c
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full_name: EFR32xG28 868-915 MHz 20 dBm (xG28-RB4401C)
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vendor: silabs
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socs:
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- name: efr32zg28b322f1024im68

‎boards/silabs/radio_boards/xg28_rb4401c/doc/efr32zg28-xg28-rb4401c.jpg

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‎boards/silabs/radio_boards/xg28_rb4401c/doc/index.rst

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.. zephyr:board:: xg28_rb4401c
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Overview
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********
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The EFR32ZG28 Radio Board is the radio board delivered with
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`_xG28-PK6024A Website`_. It contains a Wireless System-On-Chip from the
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EFR32ZG28 family built on an ARM Cortex®-M33 processor with excellent low
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power capabilities.
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The BRD4401C a.k.a. xG28-RB4401C radio board plugs into the Wireless Pro Kit
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Mainboard BRD4401C and is supported as one of :ref:`silabs_radio_boards`.
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Hardware
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********
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- EFR32ZG28B322F1024IM68 SoC
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- CPU core: ARM Cortex®-M33 with FPU
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- Flash memory: 1024 kB
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- RAM: 256 kB
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- Transmit power: up to +20 dBm
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- Operation frequency: 868-915 MHz
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- Crystals for LFXO (32.768 kHz) and HFXO (39 MHz).
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- Silicon Labs Si7021 relative humidity and temperature sensor
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- Low-power 128x128 pixel Memory LCD
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- Macronix ultra low power 8-Mbit SPI flash (MX25R8035F)
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For more information about the EFR32ZG28 SoC and BRD4401C board, refer to these
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documents:
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- `EFR32ZG28 Website`_
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- `EFR32ZG28 Datasheet`_
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- `EFR32xG28 Reference Manual`_
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- `XG28-PK6024A Website`_
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- `BRD4401C User Guide`_
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Supported Features
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==================
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.. zephyr:board-supported-hw::
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Connections and IOs
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===================
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In the following table, the column **Name** contains Pin names. For example, PA2
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means Pin number 2 on PORTA, as used in the board's datasheets and manuals.
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+-------+--------------+-------------------------------------+
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| Name | Function | Usage |
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+=======+==============+=====================================+
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| PB1 | GPIO | Push Button 0 |
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+-------+--------------+-------------------------------------+
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| PB2 | GPIO | LED0 |
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+-------+--------------+-------------------------------------+
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| PB3 | GPIO | Push Button 1 |
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+-------+--------------+-------------------------------------+
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| PC1 | US1_TX | Display/Flash SPI MOSI |
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+-------+--------------+-------------------------------------+
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| PC2 | US1_RX | Serial Flash MISO |
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+-------+--------------+-------------------------------------+
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| PC3 | US1_CLK | Serial Flash/Display SPI Clock |
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+-------+--------------+-------------------------------------+
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| PC4 | US1_CS | Serial Flash Chip Select |
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+-------+--------------+-------------------------------------+
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| PC5 | I2C0_SCL | Si7021 I2C Clock |
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+-------+--------------+-------------------------------------+
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| PC6 | GPIO | External COM Inversion Signal |
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+-------+--------------+-------------------------------------+
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| PC7 | I2C0_SDA | Si7021 I2C Data |
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+-------+--------------+-------------------------------------+
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| PC8 | US1_CS | Display Serial Chip Select |
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+-------+--------------+-------------------------------------+
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| PC9 | GPIO | Display Control Access |
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+-------+--------------+-------------------------------------+
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| PC11 | GPIO | Si7021 Enable |
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+-------+--------------+-------------------------------------+
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| PD3 | GPIO | LED1 |
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+-------+--------------+-------------------------------------+
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| PD11 | UART_TX | UART Console TX |
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+-------+--------------+-------------------------------------+
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| PD12 | UART_RX | UART Console RX |
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+-------+--------------+-------------------------------------+
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The default configuration can be found in
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:zephyr_file:`boards/silabs/radio_boards/xg28_rb4401c/xg28_rb4401c_defconfig`
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System Clock
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============
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The EFR32ZG28 SoC is configured to use the 39 MHz external oscillator on the
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board.
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Serial Port
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===========
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The EFR32ZG28 SoC has one USART and three EUSARTs.
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USART0 is connected to the board controller and is used for the console.
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Programming and Debugging
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*************************
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.. zephyr:board-supported-runners::
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Flashing
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========
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Connect the BRD4401C board with a mounted BRD4401C radio module to your host
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computer using the USB port.
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Here is an example for the :zephyr:code-sample:`hello_world` application.
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: xg28_rb4401c
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:goals: flash
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Open a serial terminal (minicom, putty, etc.) with the following settings:
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- Speed: 115200
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- Data: 8 bits
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- Parity: None
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- Stop bits: 1
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Reset the board and you should see the following message in the terminal:
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.. code-block:: console
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Hello World! xg28_rb4401c/efr32zg28b322f1024im68
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.. _xG28-PK6024A Website:
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https://www.silabs.com/development-tools/wireless/efr32xg28-pro-kit-14-dbm
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.. _BRD4401C User Guide:
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https://www.silabs.com/documents/public/user-guides/ug535-xg28-20dbm-user-guide.pdf
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.. _EFR32ZG28 Website:
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https://www.silabs.com/wireless/z-wave/efr32zg28-z-wave-800-socs
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.. _EFR32ZG28 Datasheet:
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https://www.silabs.com/documents/public/data-sheets/efr32zg28-datasheet.pdf
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.. _EFR32xG28 Reference Manual:
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https://www.silabs.com/documents/public/reference-manuals/efr32xg28-rm.pdf

‎boards/silabs/radio_boards/xg28_rb4401c/pre_dt_board.cmake

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# Copyright (c) 2021 Linaro Limited
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# SPDX-License-Identifier: Apache-2.0
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# SPI is implemented via usart so node name isn't spi@...
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list(APPEND EXTRA_DTC_FLAGS "-Wno-spi_bus_bridge")

‎boards/silabs/radio_boards/xg28_rb4401c/support/openocd.cfg

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if {[info exists env(OPENOCD_INTERFACE)]} {
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set INTERFACE $env(OPENOCD_INTERFACE)
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} else {
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# By default connect over Debug USB port using the J-Link interface
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set INTERFACE "jlink"
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}
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source [find interface/$INTERFACE.cfg]
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transport select swd
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set CHIPNAME efr32
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source [find target/efm32.cfg]
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$_TARGETNAME configure -event gdb-attach {
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echo "Debugger attaching: halting execution"
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reset halt
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gdb_breakpoint_override hard
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}
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$_TARGETNAME configure -event gdb-detach {
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echo "Debugger detaching: resuming execution"
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resume
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}

‎boards/silabs/radio_boards/xg28_rb4401c/xg28_rb4401c-pinctrl.dtsi

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/*
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* Copyright (c) 2025 Shontal Biton
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <dt-bindings/pinctrl/silabs/xg28-pinctrl.h>
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&pinctrl {
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eusart1_default: eusart1_default {
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group0 {
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pins = <EUSART1_TX_PC1>, <EUSART1_SCLK_PC3>;
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drive-push-pull;
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output-high;
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};
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group1 {
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pins = <EUSART1_RX_PC2>;
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input-enable;
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silabs,input-filter;
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};
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};
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i2c0_default: i2c0_default {
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group0 {
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pins = <I2C0_SCL_PC5>, <I2C0_SDA_PC7>;
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drive-open-drain;
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bias-pull-up;
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};
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};
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timer0_default: timer0_default {
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group0 {
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pins = <TIMER0_CC0_PB2>, <TIMER0_CC1_PD3>;
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drive-push-pull;
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output-high;
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};
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};
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usart0_default: usart0_default {
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group0 {
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pins = <USART0_TX_PA8>;
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drive-push-pull;
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output-high;
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};
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group1 {
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pins = <USART0_RX_PA9>;
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input-enable;
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silabs,input-filter;
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};
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};
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};

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