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Overview

boards/renesas/ek_ra4w1/doc/index.rst

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.. zephyr:board:: ek_ra4w1

Overview

The Renesas RA4W1 is the first Bluetooth® 5.0 Low Energy fully compliant with 2Mbit High-Throughput (HT) and Long Range support in a single chip MCU of Renesas RA4 product series for IoT applications that require a high-performance Arm® Cortex®-M4 core at a very attractive price point. The RA4W1 MCU has full function support for Bluetooth 5.0 Low Energy long-range and mesh networking, and provides excellent reception performance. RA4W1 is geared towards IoT application requiring Security, large embedded RAM and low power consumption.

MCU Native Pin Access

  • R7FA4W1AD2CNG
  • QFN-56 package
  • On-chip memory: 512-KB ROM, 96-KB RAM, 8-KB data flash memory

Power-supply voltage

  • USB connector: 5-V input
  • Power-supply IC: 5-V input, 3.3-V output
  • External power-supply header*1: 3.3-V input, 2 pins x 1

Main clock

  • Crystal oscillator (surface-mount technology (SMT)) for the main system clock
  • Crystal oscillator or ceramic resonator (lead type) for the main system clock

Sub-clock

  • Crystal oscillator (SMT) for the sub-clock

Bluetooth Low Energy

  • Bluetooth Low Energy (BLE) circuit x1
  • Range of frequency: 2402 to 2480 MHz
  • Maximum transmission output power: 4 dBm (in 4-dBm output mode)
  • Output variation: +2 dB

Push switches

  • Reset switch x 1
  • User switch x 1

LED

  • Power indicator: green x 1
  • User: green x 2
  • ACT LED: green x 1

Connectivity

  • Connector for an on-board emulator: USB Micro-B

  • Connector for a USB serial-conversion interface: USB Micro-B

  • Pmod™ connector: Angle type, 12 pins

  • Arduino™ UNO connectors

  • Emulator reset switch: DIP switch x 1

Hardware

Detailed Hardware features for the RA4W1 MCU group can be found at RA4W1 Group User's Manual Hardware_

.. figure:: ra4w1_block_diagram.webp :width: 442px :align: center :alt: RA4W1 MCU group feature

RA4W1 Block diagram (Credit: Renesas Electronics Corporation)

Detailed Hardware features for the EK-RA4W1 MCU can be found at EK-RA4W1 - User's Manual_

Supported Features

.. zephyr:board-supported-hw::

Programming and Debugging

.. zephyr:board-supported-runners::

Applications for the ek_ra4w1 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-RA4W1 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-RA4W1 - 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: R7FA4W1AD
  • 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-RA4W1 Website_
  • RA4W1 MCU group Website_

.. _EK-RA4W1 Website: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ek-ra4w1-evaluation-kit-ra4w1-mcu-group

.. _RA4W1 MCU group Website: https://www.renesas.com/us/en/products/microcontrollers-microprocessors/ra-cortex-m-mcus/ra4w1-low-energy-single-chip-32-bit-microcontrollers-48mhz-bluetooth-50

.. _EK-RA4W1 - User's Manual: https://www.renesas.com/us/en/document/man/ek-ra4w1-users-manual

.. _RA4W1 Group User's Manual Hardware: https://www.renesas.com/us/en/document/man/renesas-ra4w1-group-users-manual-hardware

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