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boards: renesas: Initial support for RSK-RX140 board
Initial commit to support for RSK-RX140 board Signed-off-by: Hau Ho <[email protected]>
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‎boards/renesas/rsk_rx140/Kconfig.rsk_rx140‎

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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_RSK_RX140
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select SOC_R5F51406

‎boards/renesas/rsk_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/rsk_rx140/board.yml‎

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board:
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name: rsk_rx140
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full_name: Renesas Starter Kit for RX140
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vendor: renesas
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socs:
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- name: r5f51406

‎boards/renesas/rsk_rx140/doc/index.rst‎

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.. zephyr:board:: rsk_rx140
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Overview
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********
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The Renesas Starter Kit for RX140 is an evaluation and starter kit for developers who are new
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to the RX140 MCU family (Program Flash 256KB, RAM 64KB, Pin Count 80-pin).
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The kit includes an LCD display module and an on-chip debugging emulator
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**MCU Native Pin Access**
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The RSK-RX140 includes:
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- 48-MHz, 32-bit RX140 MCU (R5F51406BDFN, 80-pin LFQFP package)
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- Direct MCU pin access through standard headers for easy peripheral integration
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- On-board 8 MHz crystal, 32.768 kHz sub-clock, and internal oscillators
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- Multiple low power consumption modes
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**System Control and Debugging**
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- USB Mini-B connector for serial communication (via on-board RL78/G1C USB-to-Serial MCU)
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- Power source options:
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- USB-powered
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- External DC supply (5V input jack)
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- Debugger supply (E2 Lite)
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- Debugging support:
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- Via E2 Lite debugger (14-pin connector)
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- User LEDs and buttons:
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- Four User LEDs (green, orange, red x2)
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- Power LED (green)
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- One Reset button, three User buttons
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- One potentiometer (connected to ADC input)
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- Ecosystem expansions:
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- Two Digilent Pmod connectors (LCD and Spare)
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- On-board 2Kbit I2C EEPROM
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**Special Feature Access**
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- Capacitive touch sensing (slider x1, buttons x2)
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- CAN and LIN transceivers
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- IEC60730 compliance support
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- Security functions (built-in Trusted Secure IP)
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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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- RSK-RX140: `RSK_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 ``rsk_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 RSK-RX140
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.. code-block:: console
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cd ~/zephyrproject/zephyr
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west build -p always -b rsk_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 **E2 Lite debugger** by
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connecting the board's 14-pin debug connector to the host PC.
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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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- `RSK_RX140 Website`_
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- `RX140 MCU group Website`_
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.. _RSK_RX140 Website:
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https://www.renesas.com/en/design-resources/boards-kits/rsk-rx140
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.. _RX140 MCU group Website:
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https://www.renesas.com/en/products/rx140
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.. _RSK_RX140 - User's Manual:
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https://www.renesas.com/en/document/mat/renesas-starter-kit-rx140-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/rsk_rx140/doc/rsk_rx140.webp‎

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‎boards/renesas/rsk_rx140/rsk_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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sci1_default: sci1_default {
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group1 {
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psels = <RX_PSEL(RX_PSEL_SCI_1, 2, 6)>, /* TX */
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<RX_PSEL(RX_PSEL_SCI_1, 3, 0)>; /* RX */
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};
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};
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};

‎boards/renesas/rsk_rx140/rsk_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 "rsk_rx140-pinctrl.dtsi"
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/ {
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model = "Renesas RSK+RX140 KIT";
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compatible = "renesas,rsk_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 = &uart1;
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zephyr,shell-uart = &uart1;
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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 = <&ioport0 4 GPIO_ACTIVE_LOW>;
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label = "LED1";
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};
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led3: led3 {
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gpios = <&ioport0 7 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 = &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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&subclk {
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status = "okay";
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};
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&pll {
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status = "okay";
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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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&ioport0 {
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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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&sci1 {
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pinctrl-0 = <&sci1_default>;
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pinctrl-names = "default";
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status = "okay";
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uart1: uart {
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current-speed = <115200>;
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status = "okay";
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};
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};

‎boards/renesas/rsk_rx140/rsk_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: rsk_rx140
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name: Renesas Starter Kit 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/rsk_rx140/rsk_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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