.. zephyr:board:: ek_ra4m1

Overview

The MCU integrates multiple series of software- and pin-compatible Arm®-based 32-bit cores that share a common set of Renesas peripherals to facilitate design scalability and efficient platform-based product development. The MCU provides an optimal combination of low-power, high-performance Arm Cortex®-M4 core running up to 48 MHz with the following features:

Renesas RA4M1 Microcontroller Group

• R7FA4M1AB3CFP
• 100-pin LQFP package
• 48 MHz Arm® Cortex®-M4 core with Floating Point Unit (FPU)
• 32 KB SRAM
• 256 KB code flash memory
• 8 KB data flash memory

Connectivity

• A Device USB connector for the Main MCU
• SEGGER J-Link® On-Board (OB) interface for debugging and programming of the RA4M1 MCU. A 10pin JTAG/SWD interface is also provided for connecting optional external debuggers and programmers.
• Two PMOD connectors, allowing use of appropriate PMOD compliant peripheral plug-in modules for rapid prototyping
• Pin headers for access to power and signals for the Main MCU

Multiple clock sources

• Main MCU oscillator crystals, providing precision 12.000 MHz and 32,768 Hz external reference clocks
• Additional low-precision clocks are available internal to the Main MCU

General purpose I/O ports

• One jumper to allow measuring of Main MCU current
• Copper jumpers on PCB bottom side for configuration and access to selected MCU signals

Operating voltage

• External 5 V input through the Debug USB connector supplies the on-board power regulator to power logic and interfaces on the board. External 5 V or 3.3 V may be also supplied through alternate locations on the board.
• A two-color board status LED indicating availability of regulated power and connection status of the J-Link interface.
• A red User LED, controlled by the Main MCU firmware
• A User Push-Button switch, User Capacitive Touch Button sensor, and an optional User Potentiometer, all of which are controlled by the Main MCU firmware
• MCU reset push-button switch
• MCU boot configuration jumper

Hardware

Detailed hardware features can be found at:

• RA4M1 MCU: RA4M1 Group User's Manual Hardware_
• EK-RA4M1 board: EK-RA4M1 - User's Manual_

Supported Features

.. zephyr:board-supported-hw::

Programming and Debugging

.. zephyr:board-supported-runners::

Applications for the ek_ra4m1 board can be built, flashed, and debugged in the usual way. See :ref:build_an_application and :ref:application_run for more details on building and running.

Flashing

Program can be flashed to EK-RA4M1 via the on-board SEGGER J-Link debugger. SEGGER J-link's drivers are available at https://www.segger.com/downloads/jlink/

To flash the program to board

1. Connect to J-Link OB via USB port to host PC

2. Make sure J-Link OB jumper is in default configuration as describe in EK-RA4M1 - User's Manual_

3. Execute west command

.. code-block:: console

west flash -r jlink

Debugging

You can use Segger Ozone (Segger Ozone Download_) for a visual debug interface

Once downloaded and installed, open Segger Ozone and configure the debug project like so:

• Target Device: R7FA4M1AB
• Target Interface: SWD
• Target Interface Speed: 4 MHz
• Host Interface: USB
• Program File: <path/to/your/build/zephyr.elf>

Note: It's verified that we can debug OK on Segger Ozone v3.30d so please use this or later version of Segger Ozone

References

• EK-RA4M1 Website_
• RA4M1 MCU group Website_

.. _EK-RA4M1 Website: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ek-ra4m1-evaluation-kit-ra4m1-mcu-group

.. _RA4M1 MCU group Website: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ra4m1-32-bit-microcontrollers-48mhz-arm-cortex-m4-and-lcd-controller-and-cap-touch-hmi

.. _EK-RA4M1 - User's Manual: https://www.renesas.com/us/en/document/mat/ek-ra4m1-v1-users-manual

.. _RA4M1 Group User's Manual Hardware: https://www.renesas.com/us/en/document/mah/renesas-ra4m1-group-users-manual-hardware?r=1054146

.. _Segger Ozone Download: https://www.segger.com/downloads/jlink#Ozone