Arduino UNO R4 Minima/WiFi

Board Overview

Arduino UNO R4 Minima/WiFi

Name:

arduino_uno_r4

Vendor:

Arduino

Architecture:

arm

SoC:

r7fa4m1ab3cfm

Browse board sources

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

The arduino_uno_r4 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.

arduino_uno_r4/r7fa4m1ab3cfm@minima target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M4 CPU1	arm,cortex-m4
ADC	on-chip	Renesas RA ADC node1	renesas,ra-adc
Clock control	on-chip	Renesas RA Clock Generation Circuit external clock configuration1	renesas,ra-cgc-external-clock
	on-chip	Generic fixed-rate clock provider3	fixed-clock
	on-chip	Renesas RA Sub-Clock1	renesas,ra-cgc-subclk
	on-chip	Renesas RA Clock Generation Circuit PLL Clock1	renesas,ra-cgc-pll
	on-chip	Renesas RA Clock Control node pclk block1	renesas,ra-cgc-pclk-block
	on-chip	Renesas RA Clock Control Peripheral Clock6 2	renesas,ra-cgc-pclk
Counter	on-chip	Renesas RA AGT as Counter2	renesas,ra-agt-counter
DAC	on-chip	Renesas RA DAC Controller Global1	renesas,ra-dac-global
	on-chip	Renesas RA DAC Controller1	renesas,ra-dac
GPIO & Headers	on-chip	Renesas RA GPIO I/O Port1 5	renesas,ra-gpio-ioport
	on-board	GPIO pins exposed on Arduino Uno (R3) headers1	arduino-header-r3
I2C	on-chip	Renesas RA I2C Master controller1 1	renesas,ra-iic
Interrupt controller	on-chip	ARMv7-M NVIC (Nested Vectored Interrupt Controller)1	arm,v7m-nvic
LED	on-board	Group of GPIO-controlled LEDs1	gpio-leds
	on-board	Group of PWM-controlled LEDs1	pwm-leds
Miscellaneous	on-chip	Renesas RA SCI controller1 3	renesas,ra-sci
	on-chip	Renesas RA AGT2	renesas,ra-agt
	on-chip	Renesas RA External Interrupt2 13	renesas,ra-external-interrupt
MMU / MPU	on-chip	ARMv7-M Memory Protection Unit (MPU)1	arm,armv7m-mpu
MTD	on-chip	Flash node1	soc-nv-flash
	on-board	Fixed partitions of a flash (or other non-volatile storage) memory1	fixed-partitions
PHY	on-chip	This binding is to be used by all the usb transceivers which are built-in with USB IP1	usb-nop-xceiv
Pin control	on-chip	The Renesas RA pin controller is a node responsible for controlling pin function selection and pin properties, such as routing a SCI0 RXD to P6101	renesas,ra-pinctrl-pfs
PWM	on-chip	Renesas RA Pulse Width Modulation1 7	renesas,ra-pwm
RNG	on-chip	Renesas RA SCE5 TRNG1	renesas,ra-sce5-rng
Serial controller	on-chip	Renesas RA SCI UART controller1 3	renesas,ra-sci-uart
SPI	on-chip	Renesas RA SPI controller1 1	renesas,ra-spi
SRAM	on-chip	Generic on-chip SRAM description1	mmio-sram
Timer	on-chip	ARMv7-M System Tick1	arm,armv7m-systick
USB	on-chip	Renesas RA USB full-speed controller1	renesas,ra-usbfs
	on-chip	Renesas RA USB device controller1	renesas,ra-udc
Watchdog	on-chip	Renesas RA Watchdog (wdt)1	renesas,ra-wdt

arduino_uno_r4/r7fa4m1ab3cfm@wifi target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M4 CPU1	arm,cortex-m4
ADC	on-chip	Renesas RA ADC node1	renesas,ra-adc
Clock control	on-chip	Renesas RA Clock Generation Circuit external clock configuration1	renesas,ra-cgc-external-clock
	on-chip	Generic fixed-rate clock provider3	fixed-clock
	on-chip	Renesas RA Sub-Clock1	renesas,ra-cgc-subclk
	on-chip	Renesas RA Clock Generation Circuit PLL Clock1	renesas,ra-cgc-pll
	on-chip	Renesas RA Clock Control node pclk block1	renesas,ra-cgc-pclk-block
	on-chip	Renesas RA Clock Control Peripheral Clock6 2	renesas,ra-cgc-pclk
Counter	on-chip	Renesas RA AGT as Counter2	renesas,ra-agt-counter
DAC	on-chip	Renesas RA DAC Controller Global1	renesas,ra-dac-global
	on-chip	Renesas RA DAC Controller1	renesas,ra-dac
GPIO & Headers	on-chip	Renesas RA GPIO I/O Port1 5	renesas,ra-gpio-ioport
	on-board	GPIO pins exposed on Arduino Uno (R3) headers1	arduino-header-r3
I2C	on-chip	Renesas RA I2C Master controller2	renesas,ra-iic
Interrupt controller	on-chip	ARMv7-M NVIC (Nested Vectored Interrupt Controller)1	arm,v7m-nvic
LED	on-board	Group of GPIO-controlled LEDs1	gpio-leds
	on-board	Group of PWM-controlled LEDs1	pwm-leds
Miscellaneous	on-chip	Renesas RA SCI controller1 3	renesas,ra-sci
	on-chip	Renesas RA AGT2	renesas,ra-agt
	on-chip	Renesas RA External Interrupt2 13	renesas,ra-external-interrupt
MMU / MPU	on-chip	ARMv7-M Memory Protection Unit (MPU)1	arm,armv7m-mpu
MTD	on-chip	Flash node1	soc-nv-flash
	on-board	Fixed partitions of a flash (or other non-volatile storage) memory1	fixed-partitions
PHY	on-chip	This binding is to be used by all the usb transceivers which are built-in with USB IP1	usb-nop-xceiv
Pin control	on-chip	The Renesas RA pin controller is a node responsible for controlling pin function selection and pin properties, such as routing a SCI0 RXD to P6101	renesas,ra-pinctrl-pfs
PWM	on-chip	Renesas RA Pulse Width Modulation1 7	renesas,ra-pwm
RNG	on-chip	Renesas RA SCE5 TRNG1	renesas,ra-sce5-rng
Serial controller	on-chip	Renesas RA SCI UART controller1 3	renesas,ra-sci-uart
SPI	on-chip	Renesas RA SPI controller1 1	renesas,ra-spi
SRAM	on-chip	Generic on-chip SRAM description1	mmio-sram
Timer	on-chip	ARMv7-M System Tick1	arm,armv7m-systick
USB	on-chip	Renesas RA USB full-speed controller1	renesas,ra-usbfs
	on-chip	Renesas RA USB device controller1	renesas,ra-udc
Watchdog	on-chip	Renesas RA Watchdog (wdt)1	renesas,ra-wdt

Programming and debugging

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 Building an Application and Run an Application for more details).

Here is an example for building and flashing the Blinky application.

# From the root of the zephyr repository
west build -b arduino_uno_r4@minima samples/basic/blinky
west flash

# From the root of the zephyr repository
west build -b arduino_uno_r4@wifi samples/basic/blinky
west flash

Debugging

Debugging can be done with west debug command. The following command is debugging the Blinky application. Also, see the instructions specific to the debug server that you use.

# From the root of the zephyr repository
west build -b arduino_uno_r4@minima samples/basic/blinky
west debug

# From the root of the zephyr repository
west build -b arduino_uno_r4@wifi samples/basic/blinky
west 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.

pyocd pack install r7fa4m1ab

Restoring Arduino Bootloader

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

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

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