EFR32 Radio Boards

• EFR32 BRD4104A (SLWRB4104A)
• EFR32 BRD4250B (SLWRB4250B)
• EFR32 BRD4180A (SLWRB4180A)
• EFR32 BRD4255A (SLWRB4255A)

Overview

Support for EFR32 Radio boards is provided by one of the starter kits

• SLWSTK6020B Bluetooth SoC Starter Kit

• SLWSTK6000B Mighty Gecko Wireless Starter Kit

• SLWSTK6061B Proprietary Wireless Starter Kit

• SLWSTK6006A Mighty Gecko Wireless Starter Kit

Fig. 101 SLWSTK6020B (image courtesy of Silicon Labs)

Hardware

Wireless Starter Kit Mainboard:

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

• Ultra-low power 128x128 pixel memory LCD

• 2 user buttons and 2 LEDs

• 20 pin expansion header

• Si7021 Humidity and Temperature Sensor

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

For more information about the BRD4001A board, refer to these documents:

• EFR32BG13 Blue Gecko Bluetooth Starter Kit User’s Guide

• EFR32MG21 Mighty Gecko Wireless Starter Kit User’s Guide

• WSTK Main Board BRD4001A Schematics

Supported Features

The 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
COUNTER	on-chip	rtcc
FLASH	on-chip	flash memory
GPIO	on-chip	gpio
UART	on-chip	serial port-polling; serial port-interrupt
SPI(M)	on-chip	spi port-polling
WATCHDOG	on-chip	watchdog

Other hardware features are currently not supported by the port.

Connections and IOs

In the following table, the column Name contains Pin names. For example, PA2 means Pin number 2 on PORTA, as used in the board’s datasheets and manuals.

Name	Function	Usage
PF4	GPIO	LED0
PF5	GPIO	LED1
PF6	GPIO	Push Button PB0
PF7	GPIO	Push Button PB1
PA5	GPIO	Board Controller Enable EFM_BC_EN
PA0	USART0_TX	UART Console EFM_BC_TX US0_TX #0
PA1	USART0_RX	UART Console EFM_BC_RX US0_RX #0
PC6	SPI_MOSI	Flash MOSI US1_TX #11
PC7	SPI_MISO	Flash MISO US1_RX #11
PC8	SPI_SCLK	Flash SCLK US1_CLK #11
PA4	SPI_CS	Flash Chip Select (GPIO)

Programming and Debugging

The BRD4001A 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 debug interface and a USB Serial Port.

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

• An Ethernet connection to support remote debugging.

It is compatible with the following host debug tools:

• OpenOCD Debug Host Tools

• J-Link Debug Host Tools

OpenOCD is included in the Zephyr SDK. Refer to the links above for information on how to install required host debug tools if you are not using the Zephyr SDK.

Flashing

Connect the BRD4001A main board with the mounted radio module to your host computer using the USB port.

Following example shows how to build the Hello World application for BRD4104A radio module.

# From the root of the zephyr repository
west build -b efr32_radio_brd4104a 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 should see the following message in the terminal:

Hello World! efr32_radio_brd4104a