EFR32xG21 2.4 GHz 20 dBm (SLWRB4180B)

Overview

The EFR32MG21 Mighty Gecko Radio Board is one of the two radio boards delivered with EFR32-SLWSTK6006A Website. It features a Wireless System-On-Chip (SoC) from the EFR32MG21 family, built on an ARM Cortex®-M33F processor, offering exceptional low-power performance.

The SLWRB4180B radio board is designed to connect seamlessly with the Wireless Starter Kit Mainboards BRD4001A and BRD4002A

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 BRD4180B board, refer to these documents:

Supported Features

The slwrb4180b board 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

Connections and IOs

In the following table, the column Name contains Pin names. For example, PD2 means Pin number 2 on PORTD, as used in the board’s datasheets and manuals.

Name

Function

Usage

PD2

GPIO

LED0

PD3

GPIO

LED1

PB0

GPIO

Push Button PB0

PB1

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/radio_boards/slwrb4180b/slwrb4180b_defconfig

Programming and Debugging

Flashing

Connect the BRD4001A or BRD4002A mainboard, with the BRD4180B radio module mounted, to your host computer via the USB port.

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b slwrb4180b 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! slwrb4180b