Itsybitsy RP2040

Overview

The Adafruit Itsybitsy RP2040 [1] board is based on the RP2040 microcontroller from Raspberry Pi Ltd. It is compatible with the Itsybitsy board form factor, and has a USB micro B connector.

Hardware

Microcontroller Raspberry Pi RP2040, with a max frequency of 133 MHz
Dual ARM Cortex M0+ cores
264 kByte SRAM
8 Mbyte QSPI flash
12 GPIO pins
4 ADC pins
SWDIO and SWCLK pins for programming and debugging
I2C
SPI
UART
USB micro B connector
Reset and boot buttons
Red LED
RGB LED (Neopixel)

Default Zephyr Peripheral Mapping

A0 ADC0 : GPIO26
A1 ADC1 : GPIO27
A2 ADC2 : GPIO28
A3 ADC3 : GPIO29
D24: GPIO24
D25: GPIO25
SCK SPI0 SCK : GPIO18
MO SPI0 MOSI : GPIO19
MI SPI0 MISO : GPIO20
D2 : GPIO12
ENABLE : -
SWDIO : -
SWCLK : -
D3 : GPIO5
D4 : GPIO4
RX UART0: GPIO1
TX UART0: GPIO0
SDA I2C1 : GPIO2
SCL I2C1 : GPIO3
D5 (5 Volt digital out): GPIO14
D7 : GPIO6
D9 : GPIO7
D10 : GPIO8
D11 : GPIO9
D12 : GPIO10
D13 and red LED : GPIO11
Button USBBOOT : GPIO13
RGB LED (Neopixel) signal : GPIO17
RGB LED (Neopixel) power : GPIO16

Supported Features

The adafruit_itsybitsy_rp2040 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.

`adafruit_itsybitsy_rp2040/rp2040` target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M0+ CPU2	`arm,cortex-m0+`
ADC	on-chip	Raspberry Pi Pico ADC1	`raspberrypi,pico-adc`
Clock control	on-chip	Raspberry Pi Pico clock controller node1	`raspberrypi,pico-clock-controller`
	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`
Counter	on-chip	Raspberry Pi Pico timer1	`raspberrypi,pico-timer`
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`
GPIO & Headers	on-chip	Raspberry Pi Pico GPIO Port1	`raspberrypi,pico-gpio-port`
I2C	on-chip	Raspberry Pi Pico I2C1 1	`raspberrypi,pico-i2c`
Input	on-board	Group of GPIO-bound input keys1	`gpio-keys`
Interrupt controller	on-chip	ARMv6-M NVIC (Nested Vectored Interrupt Controller) controller1	`arm,v6m-nvic`
LED	on-board	Group of GPIO-controlled LEDs1	`gpio-leds`
LED strip	on-board	The pio node configured for ws28121	`worldsemi,ws2812-rpi_pico-pio`
Miscellaneous	on-chip	Raspberry Pi Pico PIO1 1	`raspberrypi,pico-pio`
MTD	on-chip	Flash node1	`soc-nv-flash`
MTD	on-board	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`
Reset controller	on-chip	Raspberry Pi Pico Reset Controller1	`raspberrypi,pico-reset`
RTC	on-chip	Raspberry Pi Pico RTC1	`raspberrypi,pico-rtc`
Sensors	on-chip	Raspberry Pi Pico family temperature sensor node1	`raspberrypi,pico-temp`
Serial controller	on-chip	Raspberry Pi Pico UART1 1	`raspberrypi,pico-uart`
SPI	on-chip	Raspberry Pi Pico SPI1 1	`raspberrypi,pico-spi`
SRAM	on-chip	Generic on-chip SRAM1	`mmio-sram`
Timer	on-chip	ARMv6-M System Tick1	`arm,armv6m-systick`
USB	on-chip	Raspberry Pi Pico USB Device Controller1	`raspberrypi,pico-usbd`
Watchdog	on-chip	Raspberry Pi Pico Watchdog1	`raspberrypi,pico-watchdog`

Programming and Debugging

The adafruit_itsybitsy_rp2040 board supports the runners and associated west commands listed below.

	flash	debug	rtt	attach	debugserver
blackmagicprobe	✅	✅		✅
jlink	✅	✅	✅	✅	✅
openocd	✅	✅ (default)	✅	✅	✅
pyocd	✅	✅	✅	✅	✅
uf2	✅ (default)

By default programming is done via the USB connector. Press and hold the BOOT button, and then press the RST button, and the device will appear as a USB mass storage unit. Building your application will result in a build/zephyr/zephyr.uf2 file. Drag and drop the file to the USB mass storage unit, and the board will be reprogrammed.

It is also possible to program and debug the board via the SWDIO and SWCLK pins. Then a separate programming hardware tool is required, and for example the openocd software is used. Typically the OPENOCD and OPENOCD_DEFAULT_PATH values should be set when building, and the --runner openocd argument should be used when flashing. For more details on programming RP2040-based boards, see Programming and Debugging.

Flashing

To run the Blinky sample:

# From the root of the zephyr repository
west build -b adafruit_itsybitsy_rp2040 samples/basic/blinky/
west flash

Try also the Hello World, LED strip, Input dump, Console over USB CDC ACM and Analog-to-Digital Converter (ADC) with devicetree samples.