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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.

Fig. 103 EFM32WG-STK3800 (image courtesy of Silicon Labs)

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

The efm32wg_stk3800 board configuration supports the following hardware features:

Interface	Controller	Driver/Component
MPU	on-chip	memory protection unit
NVIC	on-chip	nested vector interrupt controller
SYSTICK	on-chip	systick
FLASH	on-chip	flash memory
GPIO	on-chip	gpio
UART	on-chip	serial port-polling; serial port-interrupt

The default configuration can be found in the defconfig file:

boards/arm/efm32wg_stk3800/efm32wg_stk3800_defconfig

Other hardware features are currently not supported by the port.

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

Note

Before using the kit the first time, you should update the J-Link firmware from J-Link-Downloads

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

# From the root of the zephyr repository
west build -b efm32wg_stk3800 samples/hello_world

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:

Hello World! arm