EFR32FG1 2400/868 MHz 13 dBm Dual Band (SLWRB4250B)
Overview
The EFR32FG1 Flex Gecko 2.4 GHz and 868 MHz Radio Board is delivered as part of SLWSTK6061B Proprietary Wireless Starter Kit. It contains a EFR32FG1 Wireless SoC built on an ARM Cortex®-M4F processor with excellent low power capabilities.
The BRD4250B a.k.a. SLWRB4250B radio board plugs into the Wireless Starter Kit Mainboard BRD4001A and is supported as one of Radio Boards.
Hardware
EFR32FG1P133F256GM48 Flex Gecko SoC
CPU core: ARM Cortex®-M4 with FPU
Flash memory: 256 kB
RAM: 32 kB
Transmit power: up to +13 dBm
Operation frequency: 2.4 GHz, 868 MHz
8Mbit SPI NOR Flash
Crystals for LFXO (32.768 kHz) and HFXO (38.4 MHz).
For more information about the EFR32FG1 SoC and BRD4250B 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/slwrb4250b/slwrb4250b_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 EFR32FG1P SoC is configured to use the 38.4 MHz external oscillator on the board.
Serial Port
The EFR32FG1P SoC has two 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 BRD4250B 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 slwrb4250b 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! slwrb4250b