EFR32xG27 2.4 GHz 8 dBm (xG27-RB4194A)

Overview

The EFR32xG27 2.4 GHz 8 dBm Radio Board is a plug-in board for the Wireless Starter Kit Mainboard (BRD4001A) and the Wireless Pro Kit Mainboard (BRD4002A). It is a complete reference design for the EFR32xG27 Wireless SoC, with matching network and a PCB antenna for 8 dBm output power in the 2.4 GHz band.

See Radio Boards for more information about the Wireless Mainboard platform.

Hardware

EFR32MG27C140F768IM40 SoC
CPU core: ARM Cortex®-M33 with FPU, DSP and TrustZone
Memory: 768 kB Flash, 64 kB RAM
Transmit power: up to +8 dBm
Operation frequency: 2.4 GHz
Crystals for LFXO (32.768 kHz) and HFXO (38.4 MHz)
8 Mbit SPI NOR Flash

For more information about the EFR32MG27 SoC and BRD4194A board, refer to these documents:

Supported Features

The xg27_rb4194a board supports the hardware features listed below.

on-chip / on-board: Feature integrated in the SoC / present on the board.
2 / 2: Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo: Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

`xg27_rb4194a/efr32mg27c140f768im40` target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M33 CPU1	`arm,cortex-m33`
ADC	on-chip	Silicon Labs Series 2 IADC1	`silabs,iadc`
Bluetooth	on-chip	Silicon Labs Series 2 Bluetooth HCI1	`silabs,bt-hci-efr32`
Clock control	on-chip	Silicon Labs Series 2 CMU1	`silabs,series-clock`
	on-chip	Silicon Labs Series 2 HFXO1	`silabs,hfxo`
	on-chip	Silicon Labs Series 2 HFRCODPLL1	`silabs,series2-hfrcodpll`
	on-chip	Generic fixed-rate clock provider3	`fixed-clock`
	on-chip	Silicon Labs Series 2 LFXO1	`silabs,series2-lfxo`
	on-chip	Silicon Labs Series 2 LFRCO1	`silabs,series2-lfrco`
	on-chip	Generic fixed factor clock provider18	`fixed-factor-clock`
Comparator	on-chip	Silicon Labs Series 2 ACMP1	`silabs,acmp`
Debug	on-chip	Silicon Labs Packet Trace Interface1	`silabs,pti`
Debug	on-chip	ARMv8 instrumentation trace macrocell1	`arm,armv8m-itm`
Display	on-board	Sharp LS0XX memory display controller1	`sharp,ls0xx`
DMA	on-chip	Silicon Labs Series 2 LDMA1	`silabs,ldma`
Flash controller	on-chip	Silicon Labs Series 2 MSC1	`silabs,series2-flash-controller`
GPIO & Headers	on-chip	Silicon Labs Series 2 GPIO Peripheral1	`silabs,gpio`
	on-chip	Silicon Labs Series 2 GPIO Port4	`silabs,gpio-port`
	on-board	Silicon Labs Kit Expansion Header1	`silabs,exp-header`
I2C	on-chip	Silabs I2C node1 1	`silabs,i2c`
Input	on-board	Group of GPIO-bound input keys1	`gpio-keys`
Input	on-board	Input driver for ADC attached resistor ladder buttons1	`adc-keys`
Interrupt controller	on-chip	ARMv8-M NVIC (Nested Vectored Interrupt Controller)1	`arm,v8m-nvic`
LED	on-board	Group of GPIO-controlled LEDs1	`gpio-leds`
LED	on-board	Group of PWM-controlled LEDs1	`pwm-leds`
MMU / MPU	on-chip	ARMv8-M MPU (Memory Protection Unit)1	`arm,armv8m-mpu`
MTD	on-chip	Flash node1	`soc-nv-flash`
	on-board	Fixed partitions of a flash (or other non-volatile storage) memory1	`fixed-partitions`
	on-board	Properties supporting Zephyr spi-nor flash driver (over the Zephyr SPI API) control of serial flash memories using the standard M25P80-based command set1	`jedec,spi-nor`
Networking	on-chip	Silicon Labs Series 2 Radio Interface1	`silabs,series2-radio`
Pin control	on-chip	Silicon Labs Series 2 DBUS Pin Controller1	`silabs,dbus-pinctrl`
PWM	on-chip	Silicon Labs TIMER PWM5	`silabs,timer-pwm`
PWM	on-chip	Silicon Labs LETIMER PWM1	`silabs,letimer-pwm`
Regulator	on-chip	Silicon Labs Series 2 DC-DC converter1	`silabs,series2-dcdc`
Regulator	on-board	Fixed voltage regulators1	`regulator-fixed`
Retained memory	on-chip	Silicon Labs Series 2 BURAM1	`silabs,buram`
RNG	on-chip	GECKO TRNG (True Random Number Generator)1	`silabs,gecko-trng`
RTC	on-chip	Silicon Labs Series 2 RTCC1	`silabs,rtcc`
Sensors	on-board	Silicon Labs Si7006/13/20/21 RHT Sensor1	`silabs,si7006`
Serial controller	on-chip	Silicon Labs Series 2 USART1	`silabs,usart-uart`
SPI	on-chip	Silicon Labs Series 2 USART1	`silabs,usart-spi`
SPI	on-chip	Silicon Labs Series 2 EUSART 1	`silabs,eusart-spi`
SRAM	on-chip	Generic on-chip SRAM1	`mmio-sram`
Timer	on-chip	ARMv8-M System Tick1	`arm,armv8m-systick`
	on-chip	Silicon Labs TIMER5	`silabs,series2-timer`
	on-chip	Silicon Labs Series 2 BURTC1	`silabs,gecko-burtc`
	on-chip	Silicon Labs LETIMER1	`silabs,series2-letimer`
Watchdog	on-chip	Silicon Labs Series 1-2 WDOG1	`silabs,gecko-wdog`

System Clock

The EFR32MG27 SoC is configured to use the HFRCODPLL oscillator at 76.8 MHz as the system clock, locked to the 38.4 MHz external crystal oscillator on the board.

Serial Port

The EFR32MG27 SoC has two USARTs and one EUSART. USART1 is connected to the board controller and is used for the console.

Programming and Debugging

The xg27_rb4194a board supports the runners and associated west commands listed below.

	flash	debug	rtt	debugserver	attach
jlink	✅ (default)	✅ (default)	✅	✅	✅
silabs_commander	✅

Connect the BRD4002A mainboard with a mounted BRD4194A radio board 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 xg27_rb4194a 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! xg27_rb4194a

Bluetooth

To use Bluetooth functionality, run the command below to retrieve necessary binary blobs from the Silicon Labs HAL repository.

west blobs fetch hal_silabs

Then build the Zephyr kernel and a Bluetooth sample with the following command. The Observer sample application is used in this example.

# From the root of the zephyr repository
west build -b xg27_rb4194a samples/bluetooth/observer