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Overview

boards/renesas/ek_ra6m1/doc/index.rst

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.. zephyr:board:: ek_ra6m1

Overview

The Renesas RA6M1 microcontroller is the entry point to the Renesas RA6 product series for applications that require a high-performance Arm® Cortex®-M4 core at a very attractive price point. The RA6M1 is built on a highly efficient 40nm process and is supported by an open and flexible ecosystem concept—the Flexible Software Package (FSP), built on FreeRTOS—and is expandable to use other RTOSes and middleware. The RA6M1 is suitable for IoT applications requiring security, large embedded RAM and low power consumption.

The key features of the EK-RA6M1 board are categorized in three groups as follow:

MCU Native Pin Access

  • R7FA6M1AD3CFP
  • 100-pin LQFP package
  • 120 MHz Arm® Cortex®-M4 core with Floating Point Unit (FPU)
  • 256 KB SRAM
  • 512 KB code flash memory
  • 8 KB data flash memory

Connectivity

  • A Device USB connector for the Main MCU
  • S124 MCU-based SEGGER J-Link® On-Board interface for debugging and programming of the RA6M1 MCU. A 10-pin 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 for the RA6M1 MCU group can be found at RA6M1 Group User's Manual Hardware_

.. figure:: ra6m1_block_diagram.webp :width: 442px :align: center :alt: RA6M1 MCU group feature

RA6M1 Block diagram (Credit: Renesas Electronics Corporation)

Detailed hardware features for the EK-RA6M1 MCU can be found at EK-RA6M1 - User's Manual_

Supported Features

.. zephyr:board-supported-hw::

Programming and Debugging

.. zephyr:board-supported-runners::

Applications for the ek_ra6m1 board target configuration 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-RA6M1 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-RA6M1 - 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: R7FA6M1AD
  • 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-RA6M1 Website_
  • RA6M1 MCU group Website_

.. _EK-RA6M1 Website: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ek-ra6m1-evaluation-kit-ra6m1-mcu-group

.. _RA6M1 MCU group Website: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ra6m1-32-bit-microcontrollers-120mhz-optimized-entry-point-ra6-series

.. _EK-RA6M1 - User's Manual: https://www.renesas.com/us/en/document/mat/ek-ra6m1-v1-users-manual

.. _RA6M1 Group User's Manual Hardware: https://www.renesas.com/us/en/document/mah/renesas-ra6m1-group-users-manual-hardware?r=1054156

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