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Overview

boards/renesas/ek_ra4e2/doc/index.rst

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.. zephyr:board:: ek_ra4e2

Overview

The RA4E2 Group delivers up to 100 MHz of CPU performance using an Arm® Cortex®-M33 core with 128 KB of code flash memory, 4 KB of data flash memory, and 40 KB of SRAM. RA4E2 MCUs offer high-performance and optimized peripheral functions along with the smallest package options, including space-saving 36-pin BGA and 32-pin QFN packages. The RA4E2 Group offers a wide set of peripherals, including USB Full Speed, CANFD, I3C, and ADC.

The MCU in this series incorporates a high-performance Arm Cortex®-M33 core running up to 100 MHz with the following features:

MCU Native Pin Access

  • R7FA4E2B93CFM MCU (referred to as RA MCU)
  • 100 MHz, Arm® Cortex®-M33 core
  • 128 kB Code Flash, 40 kB SRAM
  • 64 pins, LQFP package
  • Native pin access through 2 x 14-pin and 1 x 40-pin male headers
  • MCU current measurement points for precision current consumption measurement
  • Multiple clock sources - RA MCU oscillator and sub-clock oscillator crystals, providing precision 20.000 MHz and 32,768 Hz reference clock. Additional low-precision clocks are available internal to the RA MCU

System Control and Ecosystem Access

  • USB Full Speed Device (micro-AB connector)

  • Three 5 V input sources

    • USB (Debug, Full Speed)
    • External power supply (using surface mount clamp test points and J31 through holes)

  • Three Debug modes

    • Debug on-board (SWD)
    • Debug in (SWD)
    • Debug out (JTAG, SWD)

  • User LEDs and buttons

    • Three User LEDs (red, blue, green)
    • Power LED (white) indicating availability of regulated power
    • Debug LED (yellow) indicating the debug connection
    • Two User buttons
    • One Reset button

  • Five most popular ecosystems expansions

    • 2 Seeed Grove® system (I3C/Analog) connectors
    • SparkFun® Qwiic® connector
    • 2 Digilent PmodTM (SPI and UART) connectors
    • ArduinoTM (Uno R3) connector
    • MikroElektronikaTM mikroBUS connector

  • MCU boot configuration jumper

Special Feature Access

  • CAN FD (3-pin header)

Hardware

Detailed hardware features for the RA4E2 MCU group can be found at RA4E2 Group User's Manual Hardware_

.. figure:: ra4e2_block_diagram.webp :width: 442px :align: center :alt: RA4E2 MCU group feature

RA4E2 Block diagram (Credit: Renesas Electronics Corporation)

Detailed hardware features for the EK-RA4E2 MCU can be found at EK-RA4E2 - User's Manual_

Supported Features

.. zephyr:board-supported-hw::

Programming and Debugging

.. zephyr:board-supported-runners::

Applications for the ek_ra4e2 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-RA4E2 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-RA4E2 - 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: R7FA4E2B9
  • 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-RA4E2 Website_
  • RA4E2 MCU group Website_

.. _EK-RA4E2 Website: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ek-ra4e2-evaluation-kit-ra4e2-mcu-group

.. _RA4E2 MCU group Website: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ra4e2-entry-line-100mhz-arm-cortex-m33-general-purpose-microcontroller

.. _EK-RA4E2 - User's Manual: https://www.renesas.com/us/en/document/mat/ek-ra4e2-v1-users-manual

.. _RA4E2 Group User's Manual Hardware: https://www.renesas.com/us/en/document/mah/ra4e2-group-users-manual-hardware

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