EFM32HG-SLSTK3400A

Overview

The EFM32 Happy Gecko Starter Kit EFM32HG-SLSTK3400A contains a MCU from the EFM32HG family built on ARM® Cortex®-M0+ processor with excellent low power capabilities.

Hardware

Advanced Energy Monitoring system for precise current tracking
Real-time energy and power profiling
ARM Cortex M0+ with 64 kB Flash and 8 kB RAM
128 X 128 pixel Memory LCD
2 user buttons, 2 user LEDs and 2 touch buttons
20 pin expansion header
Silicon Labs Si7021 Relative Humidity/Temperature sensor
USB device interface
Integrated SEGGER J-Link USB debugger/emulator with debug out functionality

See these documents for more information

Supported Features

The efm32hg_slstk3400 board configuration supports the following hardware features:

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

The default configuration can be found in the defconfig file: boards/arm/efm32hg_slstk3400a/efm32hg_slstk3400a_defconfig

Other hardware features are currently not supported by the port.

Connections and IOs

The EFM32HG SoC has six GPIO controllers (PORTA to PORTF), but only three are currently enabled (PORTB, PORTE and PORTF) for the EFM32HG-SLSTK3400A board.

In the following table, the column Name contains Pin names. For example, PF4 means Pin number 4 on PORTF, as used in the board’s datasheets and manuals.

Name	Function	Usage
PF4	GPIO	LED0
PF5	GPIO	LED1
PC9	GPIO	Push Button PB0
PC10	GPIO	Push Button PB1
PF7	GPIO	Board Controller Enable EFM_BC_EN
PF2	USART0_TX	USART Console EFM_BC_TX U0_TX #4
PA9	USART0_RX	USART Console EFM_BC_RX U0_RX #4

System Clock

The EFM32HG SoC is configured to use the 24 MHz external oscillator on the board.

Serial Port

The EFM32HG SoC has two USARTs, two UARTs and two Low Energy UARTs (LEUART). USART1 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 EFM32HG-SLSTK3400 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-SLSTK3400A

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 efm32hg_slstk3400a samples/hello_world

Connect the EFM32HG-SLSTK3400A to your host computer using the USB port and you should see a USB connection that exposes a mass storage device (STK3400) and a USB Serial Port. Copy the generated zephyr.bin in the STK3400 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 will see this message written to the serial port:

Hello World! arm