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.
SLWRB4161A (image courtesy of Silicon Labs)
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