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boards: renesas: rx: Initial support for EK-RX261 board
Initial support for EK-RX261 board using RX261 SOC Singed-off-by: Quy Tran <[email protected]> Signed-off-by: Hau Ho <[email protected]>
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‎boards/renesas/ek_rx261/Kconfig.ek_rx261‎

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# Copyright (c) 2025 Renesas Electronics Corporation
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# SPDX-License-Identifier: Apache-2.0
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config BOARD_EK_RX261
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select SOC_R5F52618BGFP

‎boards/renesas/ek_rx261/board.cmake‎

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# Copyright (c) 2025 Renesas Electronics Corporation
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# SPDX-License-Identifier: Apache-2.0
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# options after "--tool-opt=" are directly passed to the tool. So instead of "--iface=JTAG" you could also write "--tool-opt=-if JTAG"
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board_runner_args(jlink "--device=R5F52618" "--iface=FINE" "--speed=1000" "--tool-opt=-jtagconf -1,-1 -autoconnect 1" )
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board_runner_args(rfp "--device=RX200" "--tool=e2l" "--interface=fine" "--erase")
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include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)
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include(${ZEPHYR_BASE}/boards/common/rfp.board.cmake)

‎boards/renesas/ek_rx261/board.yml‎

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board:
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name: ek_rx261
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full_name: RX261 Evaluation Kit
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vendor: renesas
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socs:
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- name: r5f52618bgfp

‎boards/renesas/ek_rx261/doc/ek_rx261.webp‎

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‎boards/renesas/ek_rx261/doc/index.rst‎

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.. zephyr:board:: ek_rx261
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Overview
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********
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The EK-RX261 is an Evaluation Kit for the Renesas RX261 MCU Group, designed to evaluate features
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of the RX261 family and accelerate embedded system development. The board includes rich
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interfaces, peripheral connectors, and expansion support for popular ecosystem modules.
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The key features of the EK-RX261 board are categorized in three groups:
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**MCU Native Pin Access**
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- RX261 MCU (R5F52618BGFP), 32-bit RXv3 core at 64MHz
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- 512KB Code Flash, 8KB Data Flash, 128KB RAM
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- Native pin access through 6 x 2-pin and 14 x 2-pin x 3-piece male headers
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- MCU current measurement points for current consumption measurement
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- Precision 8.000MHz main oscillator and 32.768kHz sub-clock
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**System Control and Ecosystem Access**
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- Four 5V input sources:
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- USB (USB DEBUG1, USB FULL SPEED, USB SERIAL)
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- External power supply (via TP5, TP6)
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- Two Debug Modes:
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- Debug on-board via E2 Emulator OB (FINE interface)
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- Debug in via 14-pin external header (FINE interface)
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- User LEDs:
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- 3 User LEDs (Red, Green, Blue)
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- 1 Power LED (White)
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- 1 Debug LED (Yellow)
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- User Buttons:
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- 2 User Switches
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- 1 Reset Switch
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- Popular ecosystem expansion connectors:
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- 2x Grove connectors (I2C / Analog)
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- 1x SparkFun Qwiic connector (I2C)
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- 2x Digilent Pmod connectors (UART/SPI/I2C)
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- Arduino Uno R3-compatible header
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- mikroBUS connector
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- USB Full Speed Host and Device (micro-B connector)
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- USB to Serial communication via FT234XD
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**Special Feature Access**
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- CAN FD transceiver with 3-pin header
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- Touch interface (2 buttons)
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Hardware
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********
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Detailed hardware features can be found at:
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- RX261 MCU: `RX261 Group User's Manual Hardware`_.
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- EK-RX261 board: `EK-RX261 - User's Manual`_.
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Supported Features
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==================
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.. zephyr:board-supported-hw::
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Programming and Debugging
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*************************
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.. zephyr:board-supported-runners::
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Applications for the ``ek_rx261`` board can be built, flashed, and debugged using standard
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Zephyr workflows. Refer to :ref:`build_an_application` and :ref:`application_run` for more details.
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**Note:** Currently, the RX261 is built and programmed using the Renesas GCC RX toolchain.
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Please follow the steps below to program it onto the board:
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- Download and install GCC for RX toolchain:
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https://llvm-gcc-renesas.com/rx-download-toolchains/
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- Set env variable:
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.. code-block:: console
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export ZEPHYR_TOOLCHAIN_VARIANT=cross-compile
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export CROSS_COMPILE=<Path/to/your/toolchain>/bin/rx-elf-
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- Build the Blinky Sample for EK-RX261
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.. code-block:: console
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cd ~/zephyrproject/zephyr
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west build -p always -b ek_rx261 samples/basic/blinky
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Flashing
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========
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Program can be flashed to EK-RX261 via either the on-board **E2 Emulator OB** or
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an external **SEGGER J-Link** debugger (using the FINE interface).
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- **Renesas Flash Programmer (RFP)** can be used with the on-board E2 Emulator OB.
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RFP is available at: https://www.renesas.com/software-tool/renesas-flash-programmer-programming-gui
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- **SEGGER J-Link** can be used with the 14-pin FINE connector (J27) for external flashing.
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J-Link drivers are available at: https://www.segger.com/downloads/jlink/
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1. **Connect to the debugger:**
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- For E2 Emulator OB: connect **USB DEBUG1 (J26)**
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- For J-Link: connect to **14-pin FINE header (J27)**
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2. **Set jumper configuration according to the selected flash mode:**
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- **E2 Emulator OB (on-board):**
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- J22: Open
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- J23: Jumper on pins **2-3**
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- J24: Open
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- J25: Open
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- **J-Link (external debugger):**
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- J22: Open
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- J23: Jumper on pins **1-2** or **2-3**
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- J24: **Closed**
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- J25: Open
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3. **Run flashing command:**
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.. code-block:: console
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west flash # For E2 Emulator OB
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west flash -r jlink # For J-Link (external debugger)
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Debugging
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=========
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The EK-RX261 supports debugging through:
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- **On-board E2 Emulator OB (via USB DEBUG1)**
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- **External debugger** using the 14-pin FINE header (J27)
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To use on-board E2 Emulator:
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- J22: Open
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- J23: Jumper on pins **2-3**
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- J24: Open
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- J25: Open
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To use external debugger:
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- J24: Closed
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- J22: Open
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- J23: Jumper on pins 1-2 or 2-3 (depending on desired pull-up/down)
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- J25: Open
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**Note:** External debugger (e.g., E2 Lite) cannot power the board. Supply external 5V via USB or TP5/TP6.
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References
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**********
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- `EK-RX261 Website`_
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- `RX261 MCU group Website`_
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.. _EK-RX261 Website:
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https://www.renesas.com/en/design-resources/boards-kits/ek-rx261
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.. _RX261 MCU group Website:
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https://www.renesas.com/en/products/rx261
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.. _EK-RX261 - User's Manual:
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https://www.renesas.com/en/document/mat/ek-rx261-v1-users-manual
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.. _RX261 Group User's Manual Hardware:
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https://www.renesas.com/en/document/mah/rx260-group-rx261-group-users-manual-hardware

‎boards/renesas/ek_rx261/ek_rx261-pinctrl.dtsi‎

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/*
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* Copyright (c) 2025 Renesas Electronics Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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&pinctrl {
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sci6_default: sci6_default {
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group1 {
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psels = <RX_PSEL(RX_PSEL_SCI_6, 11, 1)>, /* TX */
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<RX_PSEL(RX_PSEL_SCI_6, 11, 0)>; /* RX */
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};
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};
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};

‎boards/renesas/ek_rx261/ek_rx261.dts‎

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/*
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* Copyright (c) 2025 Renesas Electronics Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/dts-v1/;
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#include <renesas/r5f52618bgfp.dtsi>
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#include <dt-bindings/gpio/gpio.h>
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#include "ek_rx261-pinctrl.dtsi"
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/ {
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model = "Renesas EK-RX261 KIT";
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compatible = "renesas,ek_rx261";
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chosen {
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zephyr,sram = &sram0;
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zephyr,flash = &code_flash;
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zephyr,console = &uart6;
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zephyr,shell-uart = &uart6;
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};
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leds {
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compatible = "gpio-leds";
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led1: led1 {
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gpios = <&ioportj 1 GPIO_ACTIVE_LOW>;
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label = "LED1";
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};
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led2: led2 {
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gpios = <&ioportc 5 GPIO_ACTIVE_LOW>;
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label = "LED2";
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};
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led3: led3 {
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gpios = <&ioporta 3 GPIO_ACTIVE_LOW>;
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label = "LED3";
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};
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};
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aliases {
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led0 = &led1;
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led1 = &led2;
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led2 = &led3;
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};
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};
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&xtal {
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clock-frequency = <DT_FREQ_M(8)>;
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mosel = <0>;
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#clock-cells = <0>;
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status = "okay";
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};
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&pll {
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div = <1>;
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mul = <RX_PLL_MUL_8>;
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status = "okay";
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};
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&cmt {
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clock-frequency = <DT_FREQ_M(4)>;
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status = "okay";
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};
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&ioport3 {
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status = "okay";
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};
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&ioporta {
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status = "okay";
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};
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&ioportc {
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status = "okay";
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};
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&ioportd {
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status = "okay";
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};
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&ioportj {
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status = "okay";
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};
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&sci6 {
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pinctrl-0 = <&sci6_default>;
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pinctrl-names = "default";
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status = "okay";
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uart6: uart {
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current-speed = <115200>;
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status = "okay";
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};
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};

‎boards/renesas/ek_rx261/ek_rx261.yaml‎

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# Copyright (c) 2025 Renesas Electronics Corporation
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# SPDX-License-Identifier: Apache-2.0
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identifier: ek_rx261
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name: Renesas EK-RX261
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type: mcu
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arch: rx
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toolchain:
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- cross-compile
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supported:
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- gpio
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- serial
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- timer
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ram: 128
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flash: 512
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testing:
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timeout_multiplier: 5

‎boards/renesas/ek_rx261/ek_rx261_defconfig‎

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# Copyright (c) 2025 Renesas Electronics Corporation
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# SPDX-License-Identifier: Apache-2.0
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# Enable GPIO
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CONFIG_GPIO=y
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# Enable UART driver
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CONFIG_SERIAL=y
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CONFIG_UART_INTERRUPT_DRIVEN=y
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# Enable console
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CONFIG_CONSOLE=y
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CONFIG_UART_CONSOLE=y

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