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boards: silabs: Add support for efm32tg_stk3300
Support for the Silabs EFM32TG-STK3300 Starter Kit. Board features: * EFM32TG840F32 MCU with 32 kB flash and 4 kB RAM * Advanced Energy Monitoring * Real-time, accurate energy and power profiling * Light, LC and touch sensors * 8 x 20 LCD * SEGGER J-Link debugger Signed-off-by: Lukas Woodtli <woodtli.lukas@gmail.com>
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‎boards/silabs/starter_kits/efm32tg_stk3300/Kconfig.defconfig

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# Copyright (c) 2025, Lukas Woodtli
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# SPDX-License-Identifier: Apache-2.0
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if BOARD_EFM32TG_STK3300
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config CMU_HFXO_FREQ
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default 32000000
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config CMU_LFXO_FREQ
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default 32768
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endif # BOARD_EFM32TG_STK3300

‎boards/silabs/starter_kits/efm32tg_stk3300/Kconfig.efm32tg_stk3300

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# Copyright (c) 2025, Lukas Woodtli
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# SPDX-License-Identifier: Apache-2.0
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config BOARD_EFM32TG_STK3300
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select SOC_PART_NUMBER_EFM32TG840F32

‎boards/silabs/starter_kits/efm32tg_stk3300/board.cmake

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# Copyright (c) 2025, Lukas Woodtli
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# SPDX-License-Identifier: Apache-2.0
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board_runner_args(jlink "--device=EFM32TG840F32")
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include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

‎boards/silabs/starter_kits/efm32tg_stk3300/board.yml

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board:
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name: efm32tg_stk3300
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full_name: EFM32 Tiny Gecko (EFM32TG-STK3300)
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vendor: silabs
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socs:
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- name: efm32tg840f32

‎boards/silabs/starter_kits/efm32tg_stk3300/doc/efm32tg_stk3300.webp

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‎boards/silabs/starter_kits/efm32tg_stk3300/doc/index.rst

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.. zephyr:board:: efm32tg_stk3300
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Overview
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********
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The EFM32 Tiny Gecko Starter Kit EFM32TG-STK3300 contains a MCU from the
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EFM32TG family built on ARM® Cortex®-M3 processor with excellent low
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power capabilities.
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Hardware
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********
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- EFM32TG840F32 MCU with 32 kB flash and 4 kB RAM
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- Advanced Energy Monitoring provides real-time information about the energy
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consumption of an application or prototype design.
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- 160 segment Energy Micro LCD
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- 2 user buttons, 1 LED and a touch slider
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- Ambient Light Sensor, Inductive-capacitive metal sensor and touch sensor
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- On-board Segger J-Link USB debugger
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For more information about the EFM32TG SoC and EFM32TG-STK3300 board:
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- `EFM32TG Website`_
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- `EFM32TG Datasheet`_
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- `EFM32TG Reference Manual`_
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- `EFM32TG-STK3300 Website`_
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- `EFM32TG-STK3300 User Guide`_
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- `EFM32TG-STK3300 Schematics`_
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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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The EFM32TG SoC has six gpio controllers (PORTA to PORTF), but only three are
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currently enabled (PORTB, PORTC and PORTD) for the EFM32TG-STK3300 board.
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In the following table, the column Name contains Pin names. For example, PE2
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means Pin number 2 on PORTE, 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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| PD7 | GPIO | LED0 |
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+------+-----------+---------------------------------------+
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| PD8 | GPIO | Push Button PB0 |
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+------+-----------+---------------------------------------+
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| PB11 | GPIO | Push Button PB1 |
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+------+-----------+---------------------------------------+
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| PD0 | USART1_TX | UART Console USART1_TX #1 (EXP Pin 4) |
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+------+-----------+---------------------------------------+
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| PD1 | USART1_RX | UART Console USART1_RX #1 (EXP Pin 6) |
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+------+-----------+---------------------------------------+
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System Clock
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============
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The EFM32TG SoC is configured to use the 32 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 EFM32TG SoC has two USARTs and two Low Energy UARTs (LEUART).
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USART1 is used for the console. It is exposed to the EXP Header on the
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board (TX: Pin 4, RX: Pin 6).
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Programming and Debugging
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*************************
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.. zephyr:board-supported-runners::
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.. note::
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Before using the kit the first time, you should update the J-Link firmware
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in Simplicity Studio or with *JLinkConfig*.
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Flashing
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========
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The EFM32TG-STK3300 includes an `J-Link`_ debug adaptor built into the
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board. It is used to flash and debug the EFM32TG on the board.
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Flashing an application to EFM32-STK3300
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----------------------------------------
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The sample application :zephyr:code-sample:`hello_world` is used for this example.
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Build the Zephyr kernel and application:
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: efm32tg_stk3300
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:goals: build
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Connect the EFM32TG-STK3300 to your host computer using the USB port.
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Flash the device:
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.. code-block:: console
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west flash
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Connect the board with
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Use a Serial-to-USB cable to connect the host computer with the board.
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The serial port is exposed on the EXP Header (TX: Pin 4, RX: Pin 6).
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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 be able to see on the corresponding Serial Port
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the following message:
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.. code-block:: console
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Hello World! efm32tg_stk3300/efm32tg840f32
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.. _EFM32TG-STK3300 Website:
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https://www.silabs.com/products/development-tools/mcu/32-bit/efm32-tiny-gecko-starter-kit
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.. _EFM32TG-STK3300 User Guide:
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https://www.silabs.com/documents/public/user-guides/ug420-efm32tg-stk3300.pdf
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.. _EFM32TG-STK3300 Schematics:
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https://www.silabs.com/documents/public/schematic-files/BRD2100A-A04-schematic.pdf
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.. _EFM32TG Website:
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https://www.silabs.com/products/mcu/32-bit/efm32-tiny-gecko
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.. _EFM32TG Datasheet:
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https://www.silabs.com/documents/public/data-sheets/EFM32TG840.pdf
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.. _EFM32TG Reference Manual:
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https://www.silabs.com/documents/public/reference-manuals/EFM32TG-RM.pdf
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.. _J-Link:
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https://www.segger.com/jlink-debug-probes.html

‎boards/silabs/starter_kits/efm32tg_stk3300/efm32tg_stk3300.dts

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/*
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* Copyright (c) 2025 Lukas Woodtli
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/dts-v1/;
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#include <silabs/efm32tg840f32.dtsi>
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#include <zephyr/dt-bindings/input/input-event-codes.h>
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/ {
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model = "Silicon Labs EFM32TG STK3300 board";
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compatible = "silabs,efm32tg_stk3300", "silabs,efm32tg";
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chosen {
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zephyr,console = &usart1;
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zephyr,shell-uart = &usart1;
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zephyr,sram = &sram0;
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zephyr,flash = &flash0;
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};
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/* These aliases are provided for compatibility with samples */
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aliases {
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led0 = &led0;
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sw0 = &button0;
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sw1 = &button1;
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};
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leds {
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compatible = "gpio-leds";
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led0: led_0 {
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gpios = <&gpiod 7 0>;
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label = "LED 0";
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};
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};
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buttons {
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compatible = "gpio-keys";
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button0: button_0 {
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/* gpio flags need validation */
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gpios = <&gpiod 8 GPIO_ACTIVE_LOW>;
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label = "User Push Button 0";
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zephyr,code = <INPUT_KEY_0>;
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};
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button1: button_1 {
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/* gpio flags need validation */
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gpios = <&gpiob 11 GPIO_ACTIVE_LOW>;
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label = "User Push Button 1";
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zephyr,code = <INPUT_KEY_1>;
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};
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};
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};
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&cpu0 {
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clock-frequency = <32000000>;
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};
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&gpiob {
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status = "okay";
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};
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&gpioc {
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status = "okay";
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};
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&gpiod {
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status = "okay";
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};
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&usart1 {
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current-speed = <115200>;
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location-tx = <GECKO_LOCATION(1) GECKO_PORT_D GECKO_PIN(0)>;
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location-rx = <GECKO_LOCATION(1) GECKO_PORT_D GECKO_PIN(1)>;
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status = "okay";
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};

‎boards/silabs/starter_kits/efm32tg_stk3300/efm32tg_stk3300.yaml

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identifier: efm32tg_stk3300
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name: EFM32 Wonder Gecko Starter Kit (EFM32TG-STK3300, BRD2100)
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type: mcu
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arch: arm
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ram: 4
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flash: 32
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toolchain:
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- zephyr
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- gnuarmemb
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supported:
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- gpio
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- nvs
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testing:
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ignore_tags:
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- net
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- bluetooth
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vendor: silabs

‎boards/silabs/starter_kits/efm32tg_stk3300/efm32tg_stk3300_defconfig

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# Copyright (c) 2025, Lukas Woodtli
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# SPDX-License-Identifier: Apache-2.0
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CONFIG_ARM_MPU=n
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CONFIG_CONSOLE=y
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CONFIG_UART_CONSOLE=y
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CONFIG_SERIAL=y
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CONFIG_GPIO=y
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CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=32000000
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CONFIG_CMU_HFCLK_HFXO=y

‎dts/arm/silabs/efm32tg840f32.dtsi

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/*
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* Copyright (c) 2025 Lukas Woodtli
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <mem.h>
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#include <silabs/efm32tg.dtsi>
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/ {
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sram0: memory@20000000 {
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reg = <0x20000000 DT_SIZE_K(32)>;
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};
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soc {
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compatible = "silabs,efm32tg840f32", "silabs,efm32tg", "silabs,efm32", "simple-bus";
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flash-controller@400c0000 {
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flash0: flash@0 {
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reg = <0 DT_SIZE_K(256)>;
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};
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};
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};
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};

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