RM1261 DVK

Board Overview

RM1261 DVK

Name:

rm126x_dvk_rm1261

Vendor:

Ezurio

Architecture:

arm

SoC:

efr32bg22c224f512im40

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Overview

The RM1261 Development Kit provides support for the Ezurio RM1261 LoRa module.

The module includes an EFR32BG22 Arm Cortex-M33 CPU and a Semtech SX1261 LoRa radio.

The RM1261 module incorporates the QFN package EFR32BG22 (512kB Flash, 32kB RAM). The part features up to 16 configurable GPIOs and Lora Radio TX Power up to 15dBm.

The kit features a USB interface, an on-board SEGGER J-Link debugger, one user-LED and button, and support for hardware add-on boards via a mikroBUS socket and a Qwiic connector.

Note

You can find more information about the RM126x family of modules in the RM126x product brief, the RM126x datasheet and on the RM126x website.

You can find more information about the underlying EFR32BG22 SoC in the EFR32BG22 datasheet and EFR32BG22 reference manual.

You can find more information about the Semtech SX1261 LoRa radio in the SX126x datasheet.

Hardware

The RM1261 DVK has one crystal oscillator as follows.

• Low-frequency 32.768 kHz crystal oscillator (LFXO)

The crystal oscillator is fitted within the RM1261 module.

The module supports an external LoRa antenna.

Note

The MHF4 connector exposed via the RM1261 shield can should be used for antenna connectivity.

Full details of the DVK can be found in the RM126x DVK user guide and RM1261 DVK schematics.

Supported Features

The rm126x_dvk_rm1261 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.

rm126x_dvk_rm1261/efr32bg22c224f512im40 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
Debug	on-chip	Silicon Labs Packet Trace Interface1	silabs,pti
	on-chip	ARMv8 instrumentation trace macrocell1	arm,armv8m-itm
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	GPIO pins exposed on Mikro BUS headers1	mikro-bus
	on-board	STEMMA QT is a 4-pin JST-SH connector for I2C devices1	stemma-qt-connector
I2C	on-chip	Silabs I2C node2	silabs,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
	on-board	Group of PWM-controlled LEDs1	pwm-leds
LoRa	on-board	Semtech SX1261 LoRa Modem1	semtech,sx1261
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
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 PWM14	silabs,timer-pwm
	on-chip	Silicon Labs LETIMER PWM1	silabs,letimer-pwm
Regulator	on-chip	Silicon Labs Series 2 DC-DC converter1	silabs,series2-dcdc
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
Serial controller	on-chip	Silicon Labs Series 2 EUSART 1	silabs,eusart-uart
SPI	on-chip	Silicon Labs Series 2 USART2	silabs,usart-spi
SRAM	on-chip	Generic on-chip SRAM1	mmio-sram
Timer	on-chip	ARMv8-M System Tick1	arm,armv8m-systick
	on-chip	Silicon Labs TIMER14	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

DVK 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.

The Direction column indicates the pin direction from the module perspective, with I indicating Input, O Output and I/O both.

Name	Function	Usage	Direction
PA1	SWD_SWCLK	JLink SWCLK	I
PA2	SWD_SWDIO	JLink SWDIO	I/O
PA3	SWD_SWO	JLink SWO	O
PB2	EUART0_RTS	UART Console VCOM_RTS	O
PB3	EUART0_RX	UART Console VCOM_RX	I
PB4	EUART0_CTS	UART Console VCOM_CTS	I
PC0	USART0_SCK	mikroBUS SCK	O
PC1	GPIO	mikroBUS CS	I/O
PC2	GPIO	mikroBUS AN	I
PC3	GPIO	mikroBUS RST	O
PC4	GPIO	mikroBUS PWM	O
PC5	GPIO	mikroBUS INT / LED0	I/O
PC6	GPIO	Button 0	I
PC7	EUART0_TX	UART Console VCOM_TX	O
PD2	USART0_RX / I2C0_SCL	mikroBUS MISO / mikroBUS RX / mikroBUS SCL / Qwiic SCL	I/O
PD3	USART0_TX / I2C0_SDA	mikroBUS MOSI / mikroBUS TX / mikroBUS SDA / Qwiic SDA	I/O

Note

MikroBUS INT and LED0 are multiplexed to the same I/O. Usage is determined by solder bridge SB4. Refer to the RM126x DVK user guide and RM1261 DVK schematics for further details.

The solder bridge defaults to the closed position to enable LED0 connectivity.

Note

MikroBUS MISO, RX and SCL are multiplexed to the same I/O. Usage is determined by solder bridges SB5, SB7 and SB8. Refer to the RM126x DVK user guide and RM1261 DVK schematics for further details.

The SB7 solder bridge defaults to closed to enable MISO connectivity.

Note

MikroBUS MOSI, TX and SDA are multiplexed to the same I/O. Usage is determined by solder bridges SB9, SB11 and SB12. Refer to the RM126x DVK user guide and RM1261 DVK schematics for further details.

The SB11 solder bridge defaults to closed to enable MOSI connectivity.

Note

Qwiic SCL is multipexed to the same I/O as MikroBUS MISO, RX and SCL. MikroBUS I2C based boards can be used in conjunction with Qwiic based boards by closing solder bridges SB5 and SB6.

Qwiic SDA is multipexed to the same I/O as MikroBUS MOSI, TX and SDA. MikroBUS I2C based boards can be used in conjunction with Qwiic based boards by closing solder bridges SB9 and SB10.

Refer to the RM126x DVK user guide and RM1261 DVK schematics for further details.

EFR32BG22 To SX1261 Radio Connections

The following are internal to the RM1261 module and describe connectivity between the EFR32BG22 SoC and the SX1261 LoRa radio.

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.

The Direction column indicates the pin direction from the SoC perspective, with I indicating Input and O Output.

Name	Function	Usage	Direction
PA0	USART1_SCK	SX1261 SCK	O
PA4	USART1_TX	SX1261 MOSI	O
PA5	GPIO	SX1261 DIO1	I
PA6	GPIO	SX1261 RESET	O
PA7	GPIO	SX1261 BUSY	I
PA8	USART1_RX	SX1261 MISO	I
PB0	GPIO	SX1261 CS	O
PB1	GPIO	SX1261 ANT SW	O

SX1261 Radio Connections

In the following table, the column Name contains Pin names as defined in the SX126x datasheet.

The Direction column indicates the pin direction from the radio perspective, with O indicating Output.

Name	Function	Usage	Direction
DIO2	GPIO	RF Direction	O
DIO3	GPIO	TCXO Enable	O

System Clock

The RM1261 is configured to use the internal HFRCO oscillator as the System Clock at 38MHz. It can operate at clock speeds of up to 80 MHz.

Serial Port

The RM1261 has two USARTs and one EUART.

• USART0 is mapped to the mikroBUS SPI port.

• USART1 is dedicated to the SX1261 radio.

• EUART0 is connected to the board controller and is used for the console.

Programming and Debugging

Applications for the rm126x_dvk_rm1261 board can be built, flashed, and debugged in the usual way. See Building an Application and Run an Application for more details on building and running.

Note

Before using the kit, you should update the J-Link firmware in Simplicity Studio.

Testing the LED and button

The Blinky sample can be used to test the DVK LED.

The Button sample can be used to test the DVK button.

Testing LoRa

The LoRaWAN class A device sample can be programmed to an RM1261 DVK to demonstrate joining and uplinking to a LoRaWAN network server.

This is built as follows.

# From the root of the zephyr repository
west build -b rm126x_dvk_rm1261 samples/subsys/lorawan/class_a