.. zephyr:board:: 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 :ref:`silabs_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:

- `EFR32MG12 Website`_
- `EFR32MG12 Datasheet`_
- `EFR32xG12 Reference Manual`_
- `BRD4161A 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               |
+-----------+------------+-------------------------------------+
| SPI(M)    | on-chip    | spi port-polling                    |
+-----------+------------+-------------------------------------+
| WATCHDOG  | on-chip    | watchdog                            |
+-----------+------------+-------------------------------------+

The default configuration can be found in
:zephyr_file:`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 :zephyr:code-sample:`hello_world` application.

.. zephyr-app-commands::
   :zephyr-app: samples/hello_world
   :board: slwrb4161a
   :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! slwrb4161a


.. _EFR32MG12 Website:
   https://www.silabs.com/wireless/zigbee/efr32mg12-series-1-socs

.. _EFR32MG12 Datasheet:
   https://www.silabs.com/documents/public/data-sheets/efr32mg12-datasheet.pdf

.. _EFR32xG12 Reference Manual:
   https://www.silabs.com/documents/public/reference-manuals/efr32xg12-rm.pdf

.. _BRD4161A User Guide:
   https://www.silabs.com/documents/public/user-guides/ug260-brd4161a-user-guide.pdf