.. zephyr:board:: 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.

The BRD4180A a.k.a. SLWRB4180A radio board plugs into the Wireless Starter Kit Mainboard BRD4001A and is supported as one of :ref:silabs_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

.. zephyr:board-supported-hw::

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 :zephyr_file:boards/silabs/radio_boards/slwrb4180a/slwrb4180a_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

.. zephyr:board-supported-runners::

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 :zephyr:code-sample:hello_world application.

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: slwrb4180a :goals: 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:

.. code-block:: console

Hello World! slwrb4180a

.. _EFR32-SLWSTK6006A Website: https://www.silabs.com/products/development-tools/wireless/efr32xg21-wireless-starter-kit

.. _BRD4180A User Guide: https://www.silabs.com/documents/public/user-guides/ug385-brd4180a-user-guide.pdf

.. _EFR32MG21 Website: https://www.silabs.com/products/wireless/mesh-networking/efr32mg21-series-2-socs

.. _EFR32MG21 Datasheet: https://www.silabs.com/documents/public/data-sheets/efr32mg21-datasheet.pdf

.. _EFR32xG21 Reference Manual: https://www.silabs.com/documents/public/reference-manuals/efr32xg21-rm.pdf