EFR32 BRD4180A (SLWRB4180A)

Overview

The EFR32MG21 Mighty Gecko Radio Board is one of the two radio boards delivered with EFR32-SLWSTK6006A Website. It contains a Wireless System-On-Chip from the EFR32MG21 family built on an ARM Cortex®-M33F processor with excellent low power capabilities.

SLWRB4180A (image courtesy of Silicon Labs)

The BRD4180A a.k.a. SLWRB4180A radio board plugs into the Wireless Starter Kit Mainboard BRD4001A and is supported as one of EFR32 Radio Boards.

Hardware

• EFR32MG21A020F1024IM32 Mighty Gecko SoC

• CPU core: ARM Cortex®-M33 with FPU

• Flash memory: 1024 kB

• RAM: 96 kB

• Transmit power: up to +20 dBm

• Operation frequency: 2.4 GHz

• Crystals for LFXO (32.768 kHz) and HFXO (38.4 MHz).

For more information about the EFR32MG21 SoC and BRD4180A board, refer to these documents:

• EFR32MG21 Website

• EFR32MG21 Datasheet

• EFR32xG21 Reference Manual

• EFR32-SLWSTK6006A Website

• BRD4180A User Guide

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
I2C	on-chip	i2c 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
PB0	GPIO	LED0
PB1	GPIO	LED1
PD2	GPIO	Push Button PB0
PD3	GPIO	Push Button PB1
PD4	GPIO	Board Controller Enable EFM_BC_EN
PA5	USART1_TX	UART Console EFM_BC_TX US1_TX
PA6	USART1_RX	UART Console EFM_BC_RX US1_RX

The default configuration can be found in boards/silabs/efr32_radio/efr32_radio_efr32mg21a020f1024im32_defconfig

System Clock

The EFR32MG21 SoC is configured to use the 38.4 MHz external oscillator on the board.

Serial Port

The EFR32MG21 SoC has three USARTs. USART0 is connected to the board controller and is used for the console.

Programming and Debugging

Please refer to Programming and Debugging EFR32 Radio Board for details on the supported debug interfaces.

Flashing

Connect the BRD4001A board with a mounted BRD4180A radio module to your host computer using the USB port.

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b efr32_radio/efr32mg21a020f1024im32 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