EFR32xG28 868-915 MHz 20 dBm (xG28-RB4401C)

Overview

The EFR32ZG28 Radio Board is the radio board delivered with xG28-PK6025A Website. It contains a Wireless System-On-Chip from the EFR32ZG28 family built on an ARM Cortex®-M33 processor with excellent low power capabilities.

The BRD4401C a.k.a. xG28-RB4401C radio board plugs into the Wireless Pro Kit Mainboard BRD4002A and is supported as one of Radio Boards.

Hardware

EFR32ZG28B322F1024IM68 SoC
CPU core: ARM Cortex®-M33 with FPU
Flash memory: 1024 kB
RAM: 256 kB
Transmit power: up to +20 dBm
Operation frequency: 868-915 MHz
Crystals for LFXO (32.768 kHz) and HFXO (39 MHz).
Silicon Labs Si7021 relative humidity and temperature sensor
Low-power 128x128 pixel Memory LCD
Macronix ultra low power 8-Mbit SPI flash (MX25R8035F)

For more information about the EFR32ZG28 SoC and BRD4401C board, refer to these documents:

Supported Features

The xg28_rb4401c 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.

`xg28_rb4401c/efr32zg28b322f1024im68` target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M33 CPU1	`arm,cortex-m33`
ADC	on-chip	Silicon Labs Series 2 IADC1	`silabs,gecko-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	Generic fixed-rate clock provider3	`fixed-clock`
	on-chip	Silicon Labs Series 2 HFXO1	`silabs,hfxo`
	on-chip	Silicon Labs Series 2 LFXO1	`silabs,series2-lfxo`
	on-chip	Silicon Labs Series 2 HFRCODPLL1	`silabs,series2-hfrcodpll`
	on-chip	Silicon Labs Series 2 HFRCOEM231	`silabs,series2-hfrcoem23`
	on-chip	Silicon Labs Series 2 LFRCO1	`silabs,series2-lfrco`
	on-chip	Generic fixed factor clock provider22	`fixed-factor-clock`
Comparator	on-chip	Silicon Labs Series 2 ACMP2	`silabs,acmp`
Cryptographic accelerator	on-chip	Silicon Labs Series 2 SE Mailbox1	`silabs,gecko-semailbox`
Debug	on-chip	Silicon Labs Packet Trace Interface1	`silabs,pti`
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`
GPIO & Headers	on-chip	Silicon Labs Series 2 GPIO Port4	`silabs,gpio-port`
I2C	on-chip	Silicon Labs Series 0-2 I2C1 1	`silabs,gecko-i2c`
Input	on-board	Group of GPIO-bound input keys1	`gpio-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`
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 PWM1 4	`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`
RTC	on-chip	Silicon Labs Series 2 Sleeptimer1	`silabs,gecko-stimer`
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 EUSART 1 2	`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 TIMER1 4	`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 1	`silabs,gecko-wdog`

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
PA8	UART_TX	UART Console TX
PA9	UART_RX	UART Console RX
PB1	GPIO	Push Button 0
PB2	GPIO	LED0
PB3	GPIO	Push Button 1
PC1	US1_TX	Display/Flash SPI MOSI
PC2	US1_RX	Serial Flash MISO
PC3	US1_CLK	Serial Flash/Display SPI Clock
PC4	US1_CS	Serial Flash Chip Select
PC5	I2C0_SCL	Si7021 I2C Clock
PC6	GPIO	External COM Inversion Signal
PC7	I2C0_SDA	Si7021 I2C Data
PC8	US1_CS	Display Serial Chip Select
PC9	GPIO	Display Control Access
PC11	GPIO	Si7021 Enable
PD3	GPIO	LED1

The default configuration can be found in boards/silabs/radio_boards/xg28_rb4401c/xg28_rb4401c_defconfig

System Clock

The EFR32ZG28 SoC is configured to use the 39 MHz external oscillator on the board.

Serial Port

The EFR32ZG28 SoC has one USART and three EUSARTs. USART0 is connected to the board controller and is used for the console.

Programming and Debugging

The xg28_rb4401c board supports the runners and associated west commands listed below.

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

Flashing

Connect the BRD4002A board with a mounted BRD4401C 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 xg28_rb4401c 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! xg28_rb4401c/efr32zg28b322f1024im68