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Overview

boards/arduino/uno_r4/doc/index.rst

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.. zephyr:board:: arduino_uno_r4

Overview

The Arduino UNO R4 Minima/WiFi is a development board featuring the Renesas RA4M1 SoC in the Arduino form factor and is compatible with traditional Arduino.

Hardware

  • Renesas RA4MA1 Processor (ARM Cortex-M4 at 48 MHz)
  • 256 KiB flash memory and 32 KiB of RAM
  • One user LEDs
  • One reset button
  • One WiFi Transceiver (Arduino UNO R4 WiFi only)
  • One 12x8 LED Matrix (Arduino UNO R4 WiFi only)
  • Built-in CMSIS-DAP debug adapter (Arduino UNO R4 WiFi only)

Supported Features

.. zephyr:board-supported-hw::

Programming and debugging

.. zephyr:board-supported-runners::

Debug adapter

A debug adapter is required to flash and debug programs. Arduino UNO R4 WiFi has a built-in debug adapter that you can use for flashing and debugging.

In the Arduino UNO R4 Minima case, You need to prepare debug adapter separately. A 5V-compatible CMSIS-DAP adapter adapts to this board.

Building & Flashing

You can build and flash with west flash command (See :ref:build_an_application and :ref:application_run for more details).

Here is an example for building and flashing the :zephyr:code-sample:blinky application.

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: arduino_uno_r4@minima :goals: build flash

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: arduino_uno_r4@wifi :goals: build flash

Debugging

Debugging can be done with west debug command. The following command is debugging the :zephyr:code-sample:blinky application. Also, see the instructions specific to the debug server that you use.

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: arduino_uno_r4@minima :maybe-skip-config: :goals: debug

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: arduino_uno_r4@wifi :maybe-skip-config: :goals: debug

Using pyOCD

Various debug adapters, including cmsis-dap probes, can debug the Arduino UNO R4 with pyOCD. The default configuration uses the pyOCD for debugging. You must install CMSIS-Pack when flashing or debugging Arduino UNO R4 Minima with pyOCD. If not installed yet, execute the following command to install CMSIS-Pack for Arduino UNO R4.

.. code-block:: console

pyocd pack install r7fa4m1ab

Restoring Arduino Bootloader

If you corrupt the Arduino bootloader, you can restore it with the following command.

.. code-block:: console

wget https://raw.githubusercontent.com/arduino/ArduinoCore-renesas/main/bootloaders/UNO_R4/dfu_minima.hex pyocd flash -e sector -a 0x0 -t r7fa4m1ab dfu_minima.hex

.. code-block:: console

wget https://raw.githubusercontent.com/arduino/ArduinoCore-renesas/main/bootloaders/UNO_R4/dfu_wifi.hex pyocd flash -e sector -a 0x0 -t r7fa4m1ab dfu_wifi.hex