EFR32xG21 2.4 GHz 20 dBm (SLWRB4180B)

Board Overview

EFR32xG21 2.4 GHz 20 dBm (SLWRB4180B)

Name:

slwrb4180b

Vendor:

Silicon Laboratories

Architecture:

arm

SoC:

efr32mg21a020f1024im32

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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:

• EFR32MG21 Website

• EFR32MG21 Datasheet

• EFR32xG21 Reference Manual

• EFR32-SLWSTK6006A Website

• BRD4180B User Guide

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