Cytron Maker Uno RP2040

Board Overview

Cytron Maker Uno RP2040

Name:

maker_uno_rp2040

Vendor:

Cytron Technologies

Architecture:

arm

SoC:

rp2040

Browse board sources

Overview

The Cytron Maker Uno RP2040 [1] board is based on the RP2040 microcontroller from Raspberry Pi Ltd. The board has an Arduino header, several Grove connectors and a USB type C connector.

Hardware

• Microcontroller Raspberry Pi RP2040, with a max frequency of 133 MHz

• Dual ARM Cortex M0+ cores

• 264 kByte SRAM

• 2 Mbyte QSPI flash

• 16 GPIO pins

• 4 ADC pins

• I2C

• SPI

• UART

• USB type C connector

• LiPo charger

• Reset, boot and user buttons

• 2 RGB LEDs (Neopixels)

• Piezo buzzer with mute switch

• 4 servo ports

• Maker/Qwiic/Stemma QT/zephyr_i2c connector

• 6 Grove connectors

• Status indicators for digital pins

Default Zephyr Peripheral Mapping

The RGB LEDs are connected to GPIO25, and its pin mux setting is PIO0.

Arduino headers (note that GPIO20 and GPIO21 appear twice):

Label	Pin	Default pin mux	Also in connector
A0	GPIO26	ADC0	Grove 3
A1	GPIO27	ADC1	Grove 4
A2	GPIO28	ADC2	Grove 5
A3	GPIO29	ADC3	Grove 5
SDA	GPIO20	I2C0 SDA	Grove 6, Maker
SCL	GPIO21	I2C0 SCL	Grove 6, Maker
GP1	GPIO1	UART0 RX	Grove 1
GP0	GPIO0	UART0 TX	Grove 1
GP2	GPIO2	GPIO pull-up	User button
GP3	GPIO3	(Alias led0)
GP4	GPIO4		Grove 2
GP5	GPIO5		Grove 2
GP6	GPIO6		Grove 3
GP7	GPIO7		Grove 4
GP8	GPIO8		Buzzer
GP9	GPIO9
GP13	GPIO13	SPI1 CS
GP11	GPIO11	SPI1 MOSI	SPI header
GP12	GPIO12	SPI1 MISO	SPI header
GP10	GPIO10	SPI1 SCK	SPI header
GP20	GPIO20	I2C0 SDA	Grove 6, Maker
GP21	GPIO21	I2C0 SCL	Grove 6, Maker

SPI 6-pin header (pins also available in the Arduino header):

Label	Pin	Default pin mux
GP10	GPIO10	SPI1 SCK
GP11	GPIO11	SPI1 MOSI
GP12	GPIO12	SPI1 MISO

Servo header:

Label	Pin	Default pin mux	Zephyr PWM name
GP14	GPIO14	PWM7A	14
GP15	GPIO15	PWM7B	15
GP16	GPIO16	PWM0A	0
GP17	GPIO17	PWM0B	1

Grove connector 1 (pins also available in the Arduino header):

Label	Pin	Default pin mux
GP1	GPIO1	UART0 RX
GP0	GPIO0	UART0 TX

Grove connector 2 (pins also available in the Arduino header):

Label	Pin
GP4	GPIO4
GP5	GPIO5

Grove connector 3 (pins also available in the Arduino header):

Label	Pin	Default pin mux
GP6	GPIO6
A0	GPIO26	ADC0

Grove connector 4 (pins also available in the Arduino header):

Label	Pin	Default pin mux
GP7	GPIO7
A1	GPIO27	ADC1

Grove connector 5 (pins also available in the Arduino header):

Label	Pin	Default pin mux
A2	GPIO28	ADC2
A3	GPIO29	ADC3

Grove connector 6 (pins also available in the Maker connector and Arduino header):

Label	Pin	Default pin mux
GP20	GPIO20	I2C0 SDA
GP21	GPIO21	I2C0 SCL

Maker connector, also known as Qwiic/Stemma QT/zephyr_i2c. The pins are also available in Grove 6 and the Arduino header:

Label	Pin	Default pin mux
GP20	GPIO20	I2C0 SDA
GP21	GPIO21	I2C0 SCL

See also schematic [2].

Supported Features

The maker_uno_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.

maker_uno_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 clock112	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
	on-chip	Raspberry Pi Pico GPIO Port1	raspberrypi,pico-gpio-port
	on-board	GPIO pins exposed on Arduino Uno (R3) headers1	arduino-header-r3
	on-board	STEMMA QT is a 4-pin JST-SH connector for I2C devices1	stemma-qt-connector
I2C	on-chip	Raspberry Pi Pico I2C11	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 PIO11	raspberrypi,pico-pio
MTD	on-chip	Flash node1	soc-nv-flash
	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 UART11	raspberrypi,pico-uart
SPI	on-chip	Raspberry Pi Pico SPI11	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 maker_uno_rp2040 board supports the runners and associated west commands listed below.

	flash	debug
uf2	✅ (default)

The Maker Uno RP2040 board does not expose the SWDIO and SWCLK pins, so programming must be done via the USB port. 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.

For more details on programming RP2040-based boards, see Programming and Debugging.

Flashing

To run the LED strip sample:

# From the root of the zephyr repository
west build -b maker_uno_rp2040 samples/drivers/led/led_strip/
west flash

Try also the Hello World, Blinky, Button, Input dump and Analog-to-Digital Converter (ADC) with devicetree samples.

The use of the Maker/Qwiic/Stemma QT I2C connector is demonstrated using the Generic Light Sensor Polling sample and a separate shield:

# From the root of the zephyr repository
west build -b maker_uno_rp2040 --shield adafruit_veml7700 samples/sensor/light_polling
west flash

Use the shell to control the GPIO pins:

# From the root of the zephyr repository
west build -b maker_uno_rp2040 samples/sensor/sensor_shell -- -DCONFIG_GPIO=y -DCONFIG_GPIO_SHELL=y
west flash

To set one of the GPIO pins high, use these commands in the shell, and study the indicator LEDs:

gpio conf gpio0 2 o
gpio set gpio0 2 1

Servo motor control is done via PWM outputs. The Servomotor sample sets servo position timing (via an overlay file) for the output GP14:

# From the root of the zephyr repository
west build -b maker_uno_rp2040 samples/basic/servo_motor/
west flash

It is also possible to control servos via the pwm shell:

# From the root of the zephyr repository
west build -b maker_uno_rp2040 samples/sensor/sensor_shell -- -DCONFIG_PWM=y -DCONFIG_PWM_SHELL=y
west flash

Use shell commands to set the posiotion of the server. Most servo motor can handle pulse times between 800 and 2000 microseconds:

pwm usec pwm@40050000 14 20000 800
pwm usec pwm@40050000 14 20000 2000

To use the buzzer, you must set the pin mux for GPIO8 to PWM. This is done by adding PWM_4A_P8 to the pwm_default section in the boards/cytron/maker_uno_rp2040/maker_uno_rp2040-pinctrl.dtsi file. Turn on the buzzer switch on the long side of the board. Then build using the same command as above for the sensor_shell.

Use these shell commands to turn on and off the buzzer:

pwm usec pwm@40050000 8 1000 500
pwm usec pwm@40050000 8 1000 0

References

[1]

https://www.cytron.io/p-maker-uno-rp2040

[2]

https://drive.google.com/file/d/1BNqbxXScMXnL3-2YYfbR66nFCD1li71X/view