Pimoroni Tiny 2040

Overview

The Pimoroni Tiny 2040 [1] board is based on the RP2040 microcontroller from Raspberry Pi Ltd. The board has two 8-pin headers 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

  • 8 Mbyte QSPI flash

  • 8 GPIO pins

  • 4 ADC pins

  • I2C

  • SPI

  • UART

  • USB type C connector

  • Reset and boot buttons

  • RGB user LED (red, green and blue controlled individually)

Default Zephyr Peripheral Mapping

Description

Pin

Comments

Red LED

GPIO18

Alias led0

Green LED

GPIO19

Alias led1

Blue LED

GPIO20

Alias led2

BOOT button

GPIO23

Alias sw0

GPIO header:

Label

Pin

Default pin mux

0

GPIO0

UART0 TX

1

GPIO1

UART0 RX

2

GPIO2

I2C1 SDA

3

GPIO3

I2C1 SCL

4

GPIO4

5

GPIO5

6

GPIO6

7

GPIO7

A0

GPIO26

ADC0

A1

GPIO27

ADC1

A2

GPIO28

ADC2

A3

GPIO29

ADC3

See also schematic [2].

Supported Features

The tiny2040 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.

Programming and Debugging

The tiny2040 board supports the runners and associated west commands listed below.

flash debug

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 tiny2040 samples/basic/blinky/
west flash

Note that the red, green and blue parts of the RGB LED are controlled individually by GPIO pins. By default the red color is blinking when running the sample. The sample does not configure the GPIO pins for the green and blue parts, which is why these might show a dim light. See the implementation for the Blinky how the configuration is done, if you would like to control the other colors.

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

References