CANBed RP2040

Overview

The Longan Labs CANBed RP2040 [1] board is based on the RP2040 microcontroller from Raspberry Pi Ltd. The board has a CAN bus controller and an I2C connector for easy sensor usage. It has a micro USB 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

  • 13 GPIO pins

  • 4 ADC pins

  • I2C

  • SPI

  • UART

  • Micro USB connector

  • Reset and boot buttons

  • Blue user LED

  • Grove I2C connector, compatible with Qwiic/Stemma QT if using adapter cable

  • Grove UART connector

  • CAN bus controller MCP2515

  • CAN bus transceiver SN65HVD230

Default Zephyr Peripheral Mapping

Label

Pin

Default pin mux

LED

GPIO18

Main header (sorted according to schematic pin numbering):

Label

Pin

Default pin mux

Also in connector

GND

24

GPIO24

23

GPIO23

22

GPIO22

21

GPIO21

SCL

GPIO7

I2C1 SCL

I2C connector

SDA

GPIO6

I2C1 SDA

I2C connector

TX

GPIO0

UART0 TX

UART connector

RX

GPIO1

UART0 RX

UART connector

10

GPIO10

19

GPIO19

20

GPIO20

A3

GPIO29

ADC3

25

GPIO25

A0

GPIO26

ADC0

A1

GPIO27

ADC1

A2

GPIO28

ADC2

3V3

Grove I2C connector (pins also available in the main header):

Label

Pin

Default pin mux

SCL

GPIO7

I2C1 SCL

SDA

GPIO6

I2C1 SDA

3V3

GND

Grove UART connector (pins also available in the main header):

Label

Pin

Default pin mux

RX

GPIO1

UART0 RX

TX

GPIO0

UART0 TX

3V3

GND

SPI header:

Label

Pin

Default pin mux

MISO

GPIO4

SPI0 MISO

SCK

GPIO2

SPI0 SCK

8

GPIO8

GND

MOSI

GPIO3

SPI0 MOSI

3V3

CAN controller:

Label

Pin

Default pin mux

CANCS

GPIO9

INT

GPIO11

The CAN controller is also connected to the SPI0 pins SCK, MOSI and MISO (see above).

See also pinout [2].

Supported Features

The canbed_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.

Programming and Debugging

The canbed_rp2040 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 canbed_rp2040 samples/basic/blinky/
west flash

Try also the Hello World, Analog-to-Digital Converter (ADC) with devicetree and Controller Area Network (CAN) counter samples.

The use of the Grove/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 canbed_rp2040 --shield adafruit_veml7700 samples/sensor/light_polling
west flash

References