EFR32MG12 2.4 GHz 19 dBm (SLWRB4161A)

Overview

The EFR32MG12 Mighty Gecko Radio Board contains a Wireless System-On-Chip from the EFR32MG12 family built on an ARM Cortex®-M4F processor with excellent low power capabilities.

The BRD4161A a.k.a. SLWRB4161A radio board plugs into the Wireless Starter Kit Mainboard BRD4001A and is supported as one of Radio Boards.

Hardware

EFR32MG12P432F1024GL125 Mighty Gecko SoC
CPU core: ARM Cortex®-M4 with FPU
Flash memory: 1024 kB
RAM: 256 kB
Transmit power: up to +19 dBm
Operation frequency: 2.4 GHz and Sub-Ghz
Crystals for LFXO (32.768 kHz) and HFXO (38.4 MHz).

For more information about the EFR32MG12 SoC and BRD4170A board, refer to these documents:

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

The default configuration can be found in boards/silabs/radio_boards/slwrb4161a/slwrb4161a_defconfig

Connections and IOs

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

Pin	Function	Usage
PF4	GPIO	LED0
PF5	GPIO	LED1
PF6	GPIO	Push Button PB0
PF7	GPIO	Push Button PB1
PA5	GPIO	Board Controller Enable VCOM_ENABLE
PA0	USART0_TX	UART Console VCOM_TX US0_TX #0
PA1	USART0_RX	UART Console VCOM_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)

System Clock

The EFR32MG12P SoC is configured to use the 38.4 MHz external oscillator on the board.

Serial Port

The EFR32MG12P SoC has four USARTs and one Low Energy UARTs (LEUART). USART0 is connected to the board controller and is used for the console.

Programming and Debugging

Flashing

Connect the BRD4001A board with a mounted BRD4161A 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 slwrb4161a 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! slwrb4161a