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boards: renesas: rx: Initial support for FPB-RX261 board
Initial support for board FPB-RX261 Signed-off-by: Phi Tran <[email protected]>
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‎boards/renesas/fpb_rx261/Kconfig.fpb_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_FPB_RX261
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select SOC_R5F52618BGFP

‎boards/renesas/fpb_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(${ZEPHYR_BASE}/boards/common/rfp.board.cmake)
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include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)

‎boards/renesas/fpb_rx261/board.yml‎

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board:
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name: fpb_rx261
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full_name: RX261 Fast Prototyping Board
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vendor: renesas
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socs:
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- name: r5f52618bgfp

‎boards/renesas/fpb_rx261/doc/fpb_rx261.webp‎

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‎boards/renesas/fpb_rx261/doc/index.rst‎

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.. zephyr:board:: fpb_rx261
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Overview
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********
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The FPB-RX261 is a Fast Prototyping Board for the Renesas RX261 MCU Group, designed to
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evaluate features of the RX261 family and accelerate embedded system development. The board
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includes native MCU pin access, integrated debugger, power flexibility, and expansion connectors.
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The key features of the FPB-RX261 board are categorized in two groups:
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**MCU Native Pin Access**
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- R5F52618BGFP MCU
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- 64 MHz Renesas RXv3-based RX261 MCU in 100-pin LFQFP package
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- 512 KB Code Flash, 8 KB Data Flash, 128 KB RAM
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- Native pin access through 2 x 50-pin male headers (not fitted)
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- MCU current measurement point for precision current consumption measurement
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- RX MCU on-chip oscillators as main clock
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- Providing 32.768 kHz crystal oscillator as sub clock
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**System Control and Ecosystem Access**
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- 5V input sources:
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- USB (USB DEBUG1 - J5)
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- External 5V via 2-pin header (J8)
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- On-board debugger via E2 Emulator OB (FINE interface)
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- User LEDs:
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- 2 Green User LEDs (PJ1, PC5)
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- 1 Green Power LED
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- 1 Yellow Debug LED
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- User Buttons:
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- 1 User Switch (S1 - P32)
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- 1 Reset Switch (S2)
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- Popular expansion connectors:
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- 2x Digilent Pmod connectors (J13, J14 - UART/SPI/I2C)
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- Arduino Uno R3-compatible header (J9-J12)
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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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- FPB-RX261 board: `FPB-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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Other hardware features are currently not supported by the port.
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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 ``fpb_rx261`` board can be built, flashed, and debugged using standard Zephyr workflows.
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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 FPB-RX261
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.. code-block:: console
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cd ~/zephyrproject/zephyr
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west build -p always -b fpb_rx261 samples/basic/blinky
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Flashing
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========
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The program can be flashed to FPB-RX261 via the on-board **E2 Emulator OB**.
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- **Renesas Flash Programmer (RFP)** can be used with the on-board debugger
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https://www.renesas.com/software-tool/renesas-flash-programmer-programming-gui
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1. **Connect the board:**
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- Use USB DEBUG1 (J5) to connect the on-board E2 Emulator to the PC
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2. **Configure jumpers for flashing:**
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- J4: Jumper on pins **2-3** (enable E2 OB)
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- J7: Jumper on pins **1-2** (3.3V system voltage)
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3. **Run flashing command:**
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.. code-block:: console
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west flash
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Or use Renesas Flash Programmer with settings:
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- Debugger: E2 Emulator Lite
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- Interface: FINE
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- MCU: R5F52618
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Debugging
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=========
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Debugging is supported via:
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- **On-board E2 Emulator OB** using USB DEBUG1 (J5)
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To use debugger:
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- J4: Jumper on pins **2-3** (enable E2 OB)
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- J7: Jumper on pins **1-2** (3.3V)
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- LED4 (Yellow) indicates debugger status
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**Note:** Only one FPB-RX261 board can be debugged per PC at a time using E2 OB.
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References
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**********
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- `FPB-RX261 Website`_
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- `RX261 MCU group Website`_
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.. _FPB-RX261 Website:
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https://www.renesas.com/en/design-resources/boards-kits/fpb-rx261
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.. _RX261 MCU group Website:
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https://www.renesas.com/en/products/rx261
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.. _FPB-RX261 - User's Manual:
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http://renesas.com/en/document/mat/fpb-rx261-v1-users-manual?r=25565483
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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?r=25565707

‎boards/renesas/fpb_rx261/fpb_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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sci5_default: sci5_default {
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group1 {
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psels = <RX_PSEL(RX_PSEL_SCI_5, 0xC, 0x3)>, /* TX */
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<RX_PSEL(RX_PSEL_SCI_5, 0xC, 0x2)>; /* RX */
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};
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};
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};

‎boards/renesas/fpb_rx261/fpb_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 "fpb_rx261-pinctrl.dtsi"
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/ {
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model = "Renesas FPB-RX261";
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compatible = "renesas,fpb_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 = &uart5;
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zephyr,shell-uart = &uart5;
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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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};
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aliases {
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led0 = &led1;
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led1 = &led2;
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};
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};
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&subclk {
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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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&pclkblock {
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clocks = <&hoco>;
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};
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&clkout {
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clocks = <&hoco>;
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};
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&uclk {
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clocks = <&hoco>;
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};
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&ioport3 {
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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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&ioportj {
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status = "okay";
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};
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&sci5 {
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pinctrl-0 = <&sci5_default>;
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pinctrl-names = "default";
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status = "okay";
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uart5: uart {
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current-speed = <115200>;
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status = "okay";
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};
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};

‎boards/renesas/fpb_rx261/fpb_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: fpb_rx261
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name: Renesas RX261 Fast Prototyping Board
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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/fpb_rx261/fpb_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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