XIAO MG24

Overview

Seeed Studio XIAO MG24 is a mini development board based on Silicon Labs’ MG24. XIAO MG24 is based on ARM Cortex-M33 core, 32-bit RISC architecture with a maximum clock speed of 78MHz, supporting DSP instructions and FPU floating-point operations, possessing powerful computing power, and built-in AL/ML hardware accelerator MVP, which can efficiently process AI/machine learning algorithms. Secondly, it has excellent RF performance, with a transmission power of up to+19.5 dBm and a reception sensitivity as low as -105.4 dBm. It supports multiple IoT and wireless transmission protocols such as Matter, Thread, Zigbee, Bluetooth LE 5.3,Bluetooth mesh etc.

Hardware

EFR32MG24B220F1536IM48 Mighty Gecko SoC
CPU core: ARM Cortex®-M33 with FPU
Flash memory: 1536 kB
RAM: 256 kB
Transmit power: up to +20 dBm
Operation frequency: 2.4 GHz
Crystals for LFXO (32.768 kHz) and HFXO (39 MHz).
3.7v LiPo power and charge support
User and battery charge LEDs

For more information about the EFR32MG24 SoC and XIAO MG24 board, refer to these documents:

Supported Features

The xiao_mg24 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.

xiao_mg24

/

efr32mg24b220f1536im48

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M33 CPU1	`arm,cortex-m33`
ADC	on-chip	Silicon Labs Gecko Family IADC1	`silabs,gecko-iadc`
Bluetooth	on-chip	Bluetooth HCI on Silabs boards1	`silabs,bt-hci-efr32`
Clock control	on-chip	Silicon Labs Series 2+ clock control node1	`silabs,series-clock`
	on-chip	Generic fixed-rate clock provider3	`fixed-clock`
	on-chip	Generic fixed-rate clock provider1	`silabs,hfxo`
	on-chip	Silicon Labs LFXO peripheral (low-frequency crystal oscillator)1	`silabs,series2-lfxo`
	on-chip	Silicon Labs HFRCODPLL peripheral (high-frequency RC oscillator with digital phase-locked loop)1	`silabs,series2-hfrcodpll`
	on-chip	Silicon Labs HFRCOEM23 peripheral (high-frequency RC oscillator with energy mode 2 and 3 capability)1	`silabs,series2-hfrcoem23`
	on-chip	Silicon Labs LFRCO peripheral (low-frequency RC oscillator)1	`silabs,series2-lfrco`
	on-chip	Generic fixed factor clock provider20	`fixed-factor-clock`
Comparator	on-chip	Silabs ACMP (Analog Comparator)1	`silabs,acmp`
Cryptographic accelerator	on-chip	Silicon Labs Secure Element mailbox node1	`silabs,gecko-semailbox`
Debug	on-chip	ARMv8 instrumentation trace macrocell1	`arm,armv8m-itm`
DMA	on-chip	Silabs LDMA controller1	`silabs,ldma`
Flash controller	on-chip	Silicon Labs Series 2 flash controller1	`silabs,series2-flash-controller`
GPIO & Headers	on-chip	SiLabs Gecko GPIO1	`silabs,gecko-gpio`
	on-chip	SiLabs Gecko GPIO Port4	`silabs,gecko-gpio-port`
	on-board	GPIO pins exposed on Seeeduino Xiao (and compatible devices) headers1	`seeed,xiao-gpio`
I2C	on-chip	Silabs Gecko I2C1	`silabs,gecko-i2c`
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`
MTD	on-chip	Flash node1	`soc-nv-flash`
MTD	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	The Silabs pin controller is a singleton node responsible for controlling pin function selection and pin properties1	`silabs,dbus-pinctrl`
Regulator	on-chip	Silicon Labs Series 2 DC-DC converter1	`silabs,series2-dcdc`
RTC	on-chip	Silabs Gecko Sleep Timer (Real-Time Counter)1	`silabs,gecko-stimer`
Serial controller	on-chip	Silabs USART UART1	`silabs,usart-uart`
Serial controller	on-chip	Silabs EUSART UART1	`silabs,eusart-uart`
SPI	on-chip	Silabs EUSART SPI1	`silabs,eusart-spi`
SRAM	on-chip	Generic on-chip SRAM1	`mmio-sram`
Timer	on-chip	ARMv8-M System Tick1	`arm,armv8m-systick`
Timer	on-chip	SiLabs Gecko BURTC timer1	`silabs,gecko-burtc`
Watchdog	on-chip	Silicon Labs Gecko Family Watchdog driver1 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
PA7	GPIO	LED0
PA8	USART0_TX	UART Console TX
PA9	USART0_RX	UART Console RX

The default configuration can be found in boards/seeed/xiao_mg24/xiao_mg24_defconfig

System Clock

The EFR32MG24 SoC is configured to use the 39 MHz external oscillator on the board.

Serial Port

The EFR32MG24 SoC has one USART and two EUSARTs. USART0 is connected to the board controller and is used for the console.

Programming and Debugging

The XIAO MG24 contains an SAMD11 with CMSIS-DAP, allowing flashing, debugging, logging, etc. over the USB port. Doing so requires a version of OpenOCD that includes support for the flash on the MG24 MCU. Until those changes are included in stock OpenOCD, the version bundled with Arduino can be used, or can be installed from the OpenOCD Arduino Fork. When flashing, debugging, etc. you may need to include --openocd=/usr/local/bin/openocd --openocd-search=/usr/local/share/openocd/scripts/ options to the command.

Flashing

Connect the XIAO MG24 board to your host computer using the USB port. A USB CDC ACM serial port should appear on the host, that can be used to view logs from the flashed application.

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b xiao_mg24 samples/hello_world
west flash

Open a serial terminal (minicom, putty, etc.) connecting to the UCB CDC ACM serial port.

Reset the board and you should see the following message in the terminal:

Hello World! xiao_mg24