XIAO RP2350

Overview

The XIAO RP2350 is an IoT mini development board from Seeed Studio. It is equipped with an RP2350A SoC, an on-board WS2812 addressable LED, and USB connector. The USB bootloader allows it to be flashed without any adapter, in a drag-and-drop manner.

For more details see the Seeed Studio XIAO RP2350 [1] wiki page.

Hardware

The Seeed Studio XIAO RP2350 is a low-power microcontroller that carries the powerful Dual-core RP2350A processor with a flexible clock running up to 133 MHz. There is also 264KB of SRAM, and 2MB of on-board Flash memory.

There are 14 GPIO pins on Seeed Studio XIAO RP2350, on which there are 11 digital pins, 3 analog pins, 11 PWM Pins, 1 I2C interface, 1 UART interface, 1 SPI interface, 1 SWD Bonding pad interface. There are 8 GPIO pins on PCB bottom side as test pads with additional 8 digital pins for secondary interfaces, 1 I2C, 1 UART, 1 SPI.

Supported Features

The xiao_rp2350 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_rp2350/rp2350a/hazard3` target

Type	Location	Description	Compatible
CPU	on-chip	RISC-V CPU2	`riscv`
ADC	on-chip	Raspberry Pi Pico ADC1	`raspberrypi,pico-adc`
Clock control	on-chip	The representation of Raspberry Pi Pico’s clock11 2	`raspberrypi,pico-clock`
	on-chip	The representation of Raspberry Pi Pico’s PLL2	`raspberrypi,pico-pll`
	on-chip	The representation of Raspberry Pi Pico ring oscillator1	`raspberrypi,pico-rosc`
	on-chip	The representation of Raspberry Pi Pico external oscillator1	`raspberrypi,pico-xosc`
	on-chip	Raspberry Pi Pico clock controller node1	`raspberrypi,pico-clock-controller`
Counter	on-chip	Raspberry Pi Pico timer2	`raspberrypi,pico-timer`
Cryptographic accelerator	on-chip	Raspberry Pi Pico SHA-256 accelerator1	`raspberrypi,pico-sha256`
DMA	on-chip	Raspberry Pi Pico DMA1	`raspberrypi,pico-dma`
Flash controller	on-chip	Raspberry Pi Pico flash controller1	`raspberrypi,pico-flash-controller`
GPIO & Headers	on-chip	Raspberry Pi Pico GPIO1	`raspberrypi,pico-gpio`
	on-chip	Raspberry Pi Pico GPIO Port1 1	`raspberrypi,pico-gpio-port`
	on-board	GPIO pins exposed on Seeeduino Xiao (and compatible devices) headers1	`seeed,xiao-gpio`
	on-board	GPIO pins exposed on Seeeduino Xiao (and compatible devices) pads1	`seeed,xiao-expand`
I2C	on-chip	Raspberry Pi Pico I2C2	`raspberrypi,pico-i2c`
Interrupt controller	on-chip	Hazard3 interrupt controller1	`hazard3,hazard3-intc`
LED	on-board	Group of GPIO-controlled LEDs1	`gpio-leds`
LED	on-board	Group of PWM-controlled LEDs1	`pwm-leds`
LED strip	on-board	The pio node configured for ws28121	`worldsemi,ws2812-rpi_pico-pio`
Mailbox	on-chip	Raspberry Pi Pico interprocessor mailbox1	`raspberrypi,pico-mbox`
Miscellaneous	on-chip	Raspberry Pi Pico PIO1 2	`raspberrypi,pico-pio`
Miscellaneous	on-chip	Raspberry Pi Pico SIO1	`raspberrypi,pico-sio`
MTD	on-chip	Flash node1	`soc-nv-flash`
MTD	on-chip	Fixed partitions of a flash (or other non-volatile storage) memory1	`fixed-partitions`
Pin control	on-chip	Raspberry Pi Pico Pin Controller1	`raspberrypi,pico-pinctrl`
PWM	on-chip	Raspberry Pi Pico PWM1	`raspberrypi,pico-pwm`
Regulator	on-chip	Raspberry Pi Pico core supply regurator1	`raspberrypi,core-supply-regulator`
Regulator	on-board	Fixed voltage regulators2	`regulator-fixed`
Reset controller	on-chip	Raspberry Pi Pico Reset Controller1	`raspberrypi,pico-reset`
RNG	on-chip	Raspberry Pi Pico RNG/Entropy1	`raspberrypi,pico-rng`
Sensors	on-chip	Raspberry Pi Pico family temperature sensor node1	`raspberrypi,pico-temp`
Serial controller	on-chip	Raspberry Pi Pico UART2	`raspberrypi,pico-uart`
SPI	on-chip	Raspberry Pi Pico SPI2	`raspberrypi,pico-spi`
SRAM	on-chip	Generic on-chip SRAM1	`mmio-sram`
Timer	on-chip	RISC-V Machine Timer1	`riscv,machine-timer`
USB	on-chip	Raspberry Pi Pico USB Device Controller1	`raspberrypi,pico-usbd`
Watchdog	on-chip	Raspberry Pi Pico Watchdog1	`raspberrypi,pico-watchdog`

`xiao_rp2350/rp2350a/m33` target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M33 CPU2	`arm,cortex-m33`
ADC	on-chip	Raspberry Pi Pico ADC1	`raspberrypi,pico-adc`
Clock control	on-chip	The representation of Raspberry Pi Pico’s clock11 2	`raspberrypi,pico-clock`
	on-chip	The representation of Raspberry Pi Pico’s PLL2	`raspberrypi,pico-pll`
	on-chip	The representation of Raspberry Pi Pico ring oscillator1	`raspberrypi,pico-rosc`
	on-chip	The representation of Raspberry Pi Pico external oscillator1	`raspberrypi,pico-xosc`
	on-chip	Raspberry Pi Pico clock controller node1	`raspberrypi,pico-clock-controller`
Counter	on-chip	Raspberry Pi Pico timer2	`raspberrypi,pico-timer`
Cryptographic accelerator	on-chip	Raspberry Pi Pico SHA-256 accelerator1	`raspberrypi,pico-sha256`
DMA	on-chip	Raspberry Pi Pico DMA1	`raspberrypi,pico-dma`
Flash controller	on-chip	Raspberry Pi Pico flash controller1	`raspberrypi,pico-flash-controller`
GPIO & Headers	on-chip	Raspberry Pi Pico GPIO1	`raspberrypi,pico-gpio`
	on-chip	Raspberry Pi Pico GPIO Port1 1	`raspberrypi,pico-gpio-port`
	on-board	GPIO pins exposed on Seeeduino Xiao (and compatible devices) headers1	`seeed,xiao-gpio`
	on-board	GPIO pins exposed on Seeeduino Xiao (and compatible devices) pads1	`seeed,xiao-expand`
I2C	on-chip	Raspberry Pi Pico I2C2	`raspberrypi,pico-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`
LED	on-board	Group of PWM-controlled LEDs1	`pwm-leds`
LED strip	on-board	The pio node configured for ws28121	`worldsemi,ws2812-rpi_pico-pio`
Mailbox	on-chip	Raspberry Pi Pico interprocessor mailbox1	`raspberrypi,pico-mbox`
Miscellaneous	on-chip	Raspberry Pi Pico PIO1 2	`raspberrypi,pico-pio`
Miscellaneous	on-chip	Raspberry Pi Pico SIO1	`raspberrypi,pico-sio`
MTD	on-chip	Flash node1	`soc-nv-flash`
MTD	on-chip	Fixed partitions of a flash (or other non-volatile storage) memory1	`fixed-partitions`
Pin control	on-chip	Raspberry Pi Pico Pin Controller1	`raspberrypi,pico-pinctrl`
PWM	on-chip	Raspberry Pi Pico PWM1	`raspberrypi,pico-pwm`
Regulator	on-chip	Raspberry Pi Pico core supply regurator1	`raspberrypi,core-supply-regulator`
Regulator	on-board	Fixed voltage regulators2	`regulator-fixed`
Reset controller	on-chip	Raspberry Pi Pico Reset Controller1	`raspberrypi,pico-reset`
RNG	on-chip	Raspberry Pi Pico RNG/Entropy1	`raspberrypi,pico-rng`
Sensors	on-chip	Raspberry Pi Pico family temperature sensor node1	`raspberrypi,pico-temp`
Serial controller	on-chip	Raspberry Pi Pico UART2	`raspberrypi,pico-uart`
SPI	on-chip	Raspberry Pi Pico SPI2	`raspberrypi,pico-spi`
SRAM	on-chip	Generic on-chip SRAM1	`mmio-sram`
Timer	on-chip	ARMv8-M System Tick1	`arm,armv8m-systick`
USB	on-chip	Raspberry Pi Pico USB Device Controller1	`raspberrypi,pico-usbd`
Watchdog	on-chip	Raspberry Pi Pico Watchdog1	`raspberrypi,pico-watchdog`

Pin Mapping

The peripherals of the RP2350A SoC can be routed to various pins on the board. The configuration of these routes can be modified through DTS. Please refer to the datasheet to see the possible routings for each peripheral.

Default Zephyr Peripheral Mapping:

primary and secondary interfaces

UART0_TX : P0
UART0_RX : P1
I2C1_SDA : P6
I2C1_SCL : P7
SPI0_CS : P5 (GPIO)
SPI0_RX : P4
SPI0_TX : P3
SPI0_SCK : P2
UART1_TX : P20
UART1_RX : P21
I2C0_SDA : P16
I2C0_SCL : P17
SPI1_CS : P9 (GPIO)
SPI1_SCK : P10
SPI1_RX : P11
SPI1_TX : P12

Connections and IOs

The board uses a standard XIAO pinout on edge connectors and additional XIAO test pads on bottom side of the PCB. The Seeed Studio XIAO RP2350 [1] wiki has detailed information about the board, including pinouts [2] and schematic [3].

Programming and Debugging

The xiao_rp2350 board supports the runners and associated west commands listed below.

	flash	debug
uf2	✅ (default)

Flashing

Using UF2

You can flash the Xiao RP2350 with a UF2 file. By default, building an app for this board will generate a build/zephyr/zephyr.uf2 file. If the Xiao RP2350 is powered on with the BOOTSEL button pressed, it will appear on the host as a mass storage device. The UF2 file should be copied to the device, which will flash the Xiao RP2350.