.. zephyr:board:: efm32wg_stk3800

Overview

The EFM32 Wonder Gecko Starter Kit EFM32WG-STK3800 contains a MCU from the EFM32WG family built on ARM® Cortex®-M4F processor with excellent low power capabilities.

Hardware

Advanced Energy Monitoring provides real-time information about the energy consumption of an application or prototype design.
32MByte parallel NAND Flash
160 segment Energy Micro LCD
2 user buttons, 2 LEDs and a touch slider
Ambient Light Sensor and Inductive-capacitive metal sensor
On-board Segger J-Link USB debugger

For more information about the EFM32WG SoC and EFM32WG-STK3800 board:

EFM32WG Website_
EFM32WG Datasheet_
EFM32WG Reference Manual_
EFM32WG-STK3800 Website_
EFM32WG-STK3800 User Guide_
EFM32WG-STK3800 Schematics_

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

The EFM32WG SoC has six gpio controllers (PORTA to PORTF), but only three are currently enabled (PORTB, PORTE and PORTF) for the EFM32WG-STK3800 board.

In the following table, the column Name contains Pin names. For example, PE2 means Pin number 2 on PORTE, as used in the board's datasheets and manuals.

+-------+-------------+-------------------------------------+ | Name | Function | Usage | +=======+=============+=====================================+ | PE2 | GPIO | LED0 | +-------+-------------+-------------------------------------+ | PE3 | GPIO | LED1 | +-------+-------------+-------------------------------------+ | PB9 | GPIO | Push Button PB0 | +-------+-------------+-------------------------------------+ | PB10 | GPIO | Push Button PB1 | +-------+-------------+-------------------------------------+ | PF7 | GPIO | Board Controller Enable | | | | EFM_BC_EN | +-------+-------------+-------------------------------------+ | PE0 | UART0_TX | UART Console EFM_BC_TX U0_TX #1 | +-------+-------------+-------------------------------------+ | PE1 | UART0_RX | UART Console EFM_BC_RX U0_RX #1 | +-------+-------------+-------------------------------------+

System Clock

The EFM32WG SoC is configured to use the 48 MHz external oscillator on the board.

Serial Port

The EFM32WG SoC has three USARTs, two UARTs and two Low Energy UARTs (LEUART). UART0 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 EFM32WG-STK3800 includes an J-Link_ serial and debug adaptor built into the board. The adaptor provides:

A USB connection to the host computer, which exposes a Mass Storage and a USB Serial Port.
A Serial Flash device, which implements the USB flash disk file storage.
A physical UART connection which is relayed over interface USB Serial port.

Flashing an application to EFM32-STK3800

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: efm32wg_stk3800 :goals: build

Connect the EFM32WG-STK3800 to your host computer using the USB port and you should see a USB connection which exposes a Mass Storage (STK3800) and a USB Serial Port. Copy the generated zephyr.bin in the STK3800 drive.

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 be able to see on the corresponding Serial Port the following message:

.. code-block:: console

Hello World! efm32wg_stk3800

.. _EFM32WG-STK3800 Website: http://www.silabs.com/products/development-tools/mcu/32-bit/efm32-wonder-gecko-starter-kit

.. _EFM32WG-STK3800 User Guide: http://www.silabs.com/documents/public/user-guides/efm32wg-stk3800-ug.pdf

.. _EFM32WG-STK3800 Schematics: http://www.silabs.com/documents/public/schematic-files/BRD2400A_A00.pdf

.. _EFM32WG Website: http://www.silabs.com/products/mcu/32-bit/efm32-wonder-gecko

.. _EFM32WG Datasheet: http://www.silabs.com/documents/public/data-sheets/EFM32WG990.pdf

.. _EFM32WG Reference Manual: http://www.silabs.com/documents/public/reference-manuals/EFM32WG-RM.pdf

.. _J-Link: https://www.segger.com/jlink-debug-probes.html