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boards: renesas: Initial support for FPB-RX140 board
Initial commit to support for FPB-RX140 board Signed-off-by: Hau Ho <[email protected]>
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‎boards/renesas/fpb_rx140/Kconfig.fpb_rx140‎

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# Copyright (c) 2024 Renesas Electronics Corporation
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# SPDX-License-Identifier: Apache-2.0
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config BOARD_FPB_RX140
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select SOC_R5F51406

‎boards/renesas/fpb_rx140/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=R5F51406" "--iface=FINE" "--speed=1000" "--tool-opt=-jtagconf -1,-1 -autoconnect 1")
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board_runner_args(rfp "--device=RX100" "--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_rx140/board.yml‎

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board:
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name: fpb_rx140
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full_name: Fast Prototyping Board for RX140
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vendor: renesas
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socs:
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- name: r5f51406

‎boards/renesas/fpb_rx140/doc/fpb_rx140.webp‎

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‎boards/renesas/fpb_rx140/doc/index.rst‎

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.. zephyr:board:: fpb_rx140
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Overview
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********
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The Fast Prototyping Board for RX140 MCU Group comes equipped with an RX140 MCU
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(R5F51406BGFN). The board is inexpensive for RX140 evaluation and prototype development of
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various applications. It has an emulator circuit so you can write/debug programs just by
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connecting it to a PC with a USB cable. In addition, it has high expandability with Arduino Uno
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and two Pmod™ connectors as standard, and through-hole access to all pins of the
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microcontroller.
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**MCU Native Pin Access**
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- R5F51406ADFN MCU
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- Max 48MHz, 32-bit RXv2 core (RXv2)
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- 256 KB Flash, 64 KB RAM
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- 80-pin, LFQFP package
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- Native pin access through 2 x 40-pin male headers (not fitted)
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- RX 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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- Two 5 V input sources
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- USB
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- External power supply (using 2-pin header [not fitted])
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- On-board debugger / programmer (E2 emulator On Board (referred as E2OB, FINE Interface))
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- User LEDs and switches
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- Two User LEDs (green)
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- Power LED (green) indicating availability of regulated power
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- Debug LED (yellow) indicating the debug connection
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- One User switch
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- One Reset switch
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- Two popular ecosystem expansions
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- Two Digilent PmodTM
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- Arduino® (Uno R3) connector
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Hardware
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********
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Detailed hardware features can be found at:
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- RX140 MCU: `RX140 Group User's Manual Hardware`_
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- FPB-RX140: `FPB_RX140 - 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 ``fpb_rx140`` 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 RX140 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-RX140
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.. code-block:: console
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cd ~/zephyrproject/zephyr
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west build -p always -b fpb_rx140 samples/basic/blinky
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Flashing
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========
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The program can be flashed to RSK-RX140 using the **E2OB** by connecting the board to the host PC
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and open Jumper J4.
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Here’s an example for building and flashing the :zephyr:code-sample:`hello_world` application.
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: rsk_rx140
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:goals: build flash
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Debugging
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=========
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You can use `Renesas Debug extension`_ on Visual Studio Code for a visual debug interface.
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The configuration for launch.json is as below.
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.. code-block:: json
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{
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"version": "0.2.0",
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"configurations": [
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{
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"type": "renesas-hardware",
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"request": "launch",
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"name": "RX140 Renesas Debugging E2lite",
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"target": {
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"deviceFamily": "RX",
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"device": "R5F51406",
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"debuggerType": "E2LITE"
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"serverParameters": [
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"-uUseFine=", "1",
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"-w=", "0",
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],
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}
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}
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]
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}
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References
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**********
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- `FPB_RX140 Website`_
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- `RX140 MCU group Website`_
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.. _FPB_RX140 Website:
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https://www.renesas.com/en/design-resources/boards-kits/fpb-rx140
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.. _RX140 MCU group Website:
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https://www.renesas.com/en/products/rx140
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.. _FPB_RX140 - User's Manual:
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https://www.renesas.com/en/document/mat/fpb-rx140-v1-users-manual
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.. _RX140 Group User's Manual Hardware:
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https://www.renesas.com/en/document/mah/rx140-group-users-manual-hardware-rev120
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.. _Renesas Debug extension:
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https://marketplace.visualstudio.com/items?itemName=RenesasElectronicsCorporation.renesas-debug

‎boards/renesas/fpb_rx140/fpb_rx140-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, 10, 4)>, /* TX */
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<RX_PSEL(RX_PSEL_SCI_5, 10, 3)>; /* RX */
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};
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};
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};

‎boards/renesas/fpb_rx140/fpb_rx140.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/r5f51406.dtsi>
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#include <dt-bindings/gpio/gpio.h>
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#include "fpb_rx140-pinctrl.dtsi"
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/ {
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model = "Renesas FPB+RX140 KIT";
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compatible = "renesas,fpb_rx140";
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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,flash-controller = &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 = <&ioport2 0 GPIO_ACTIVE_LOW>;
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label = "LED1";
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};
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led2: led2 {
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gpios = <&ioport3 2 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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&pclkblock {
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clocks = <&hoco>;
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};
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&cmt {
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clock-frequency = <3000000>;
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status = "okay";
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};
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&ioport2 {
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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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&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_rx140/fpb_rx140.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_rx140
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name: Fast Prototyping Board for RX140
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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: 64
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flash: 256

‎boards/renesas/fpb_rx140/fpb_rx140_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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