WGM160P Starter Kit

Overview

The WGM160P Starter Kit SLWSTK6121A comes with the BRD4321A radio board. This radio boards contains a WGM160P module, which combines the WF200 Wi-Fi transceiver with an EFM32GG11 microcontroller.

SLWSTK6121A (image courtesy of Silicon Labs)

Hardware

• Advanced Energy Monitoring provides real-time information about the energy consumption of an application or prototype design.

• Ultra low power 128x128 pixel color Memory-LCD

• 2 user buttons and 2 LEDs

• Si7021 Humidity and Temperature Sensor

• On-board Segger J-Link USB and Ethernet debugger

• 10/100Base-TX ethernet PHY and RJ-45 jack (on included expansion board)

• MicroSD card slot

• USB Micro-AB connector

For more information about the WGM160P and SLWSTK6121A board:

• WGM160P Website

• WGM160P Datasheet

• SLWSTK6121A Website

• SLWSTK6121A User Guide

• EFM32GG11 Datasheet

• EFM32GG11 Reference Manual

• WF200 Datasheet

Supported Features

The efm32gg_slwstk6121a board configuration supports the following hardware features:

Interface	Controller	Driver/Component
MPU	on-chip	memory protection unit
COUNTER	on-chip	rtcc
ETHERNET	on-chip	ethernet
FLASH	on-chip	flash memory
GPIO	on-chip	gpio
I2C	on-chip	i2c port-polling
NVIC	on-chip	nested vector interrupt controller
SYSTICK	on-chip	systick
UART	on-chip	serial port-polling; serial port-interrupt

The default configuration can be found in the defconfig file:

boards/arm/efm32gg_slwstk6121a/efm32gg_slwstk6121a_defconfig

Other hardware features, including the WF200 WiFi transceiver, are currently not supported by the port.

Connections and IOs

The WGM160P’s EFM32GG11 SoC has six GPIO controllers (PORTA to PORTF), all of which are currently enabled for the SLWSTK6121A board.

In the following table, the column Name contains pin names. For example, PE1 means pin number 1 on PORTE, as used in the board’s datasheets and manuals.

Name	Function	Usage
PA4	GPIO	LED0
PA5	GPIO	LED1
PD6	GPIO	Push Button PB0
PD8	GPIO	Push Button PB1
PE7	UART_TX	UART TX Console VCOM_TX US0_TX #1
PE6	UART_RX	UART RX Console VCOM_RX US0_RX #1
PB11	I2C_SDA	SENSOR_I2C_SDA I2C1_SDA #1
PB12	I2C_SCL	SENSOR_I2C_SCL I2C1_SCL #1

System Clock

The EFM32GG11 SoC is configured to use the 50 MHz external oscillator on the board.

Serial Port

The EFM32GG11 SoC has four USARTs, two UARTs and two Low Energy UARTs (LEUART). USART0 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 SLWSTK6121A includes an J-Link serial and debug adaptor built into the board. The adaptor provides:

• A USB connection to the host computer

• A physical UART connection which is relayed over interface USB serial port.

Flashing an application to SLWSTK6121A

Connect the SLWSTK6121A to your host computer using the USB port.

Here is an example to build and flash the Hello World application.

# From the root of the zephyr repository
west build -b efm32gg_slwstk6121a samples/hello_world
west flash

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’ll see the following message on the corresponding serial port terminal session:

Hello World! efm32gg_slwstk6121a