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boards: renesas: Initial support for MCB-RX26T board
Initial commit to support for MCB-RX26T board Signed-off-by: Hau Ho <[email protected]>
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‎boards/renesas/mcb_rx26t/Kconfig.mcb_rx26t

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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_MCB_RX26T
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select SOC_R5F526TFDDFP

‎boards/renesas/mcb_rx26t/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=R5F526TF" "--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/mcb_rx26t/board.yml

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board:
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name: mcb_rx26t
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vendor: renesas
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socs:
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- name: r5f526tfddfp

‎boards/renesas/mcb_rx26t/doc/index.rst

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.. zephyr:board:: mcb_rx26t
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Overview
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********
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MCB-RX26T Type B is a CPU board for motor control evaluation. By using this product in combination with
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an inverter board, motor control using RX26T can be easily performed.
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**MCU Native Pin Access**
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The MCB-RX26T Type B includes:
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- CPU maximum operating frequency 120MHz, 32-bit RXv3 Core
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- Package/Pin count: LFQFP/100 pin
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- ROM/RAM: 512KB/48KB
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- MCU input clock: 10MHz (Generate with external crystal oscillator)
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**System Control and Debugging**
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- Power supply: DC 5V,3.3V (selectable with jumper switch) Select one way automatically from the below
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- USB-powered (debug port)
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- External power supply via standard input
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- Debugging support:
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- Via E2lite debugger with E2OB (Onboard debugger circuit)
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- Connector:
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- Inverter board connector
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- USB connector for E2 OB
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- SCI connector for Renesas Motor Workbench communication
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- Through hole for CAN communication
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- Through hole for SPI communication
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- PMOD connectors
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- User LEDs and buttons:
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- Four User LEDs
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- Power LED indicating availability of regulated power
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- One Reset button
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Hardware
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********
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Detailed hardware features can be found at:
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- RX26T MCU: `RX26T Group User's Manual Hardware`_
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- MCB-RX26T Type B: `MCB-RX26T Type B - User's Manual`_
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Note:
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The CPU used in the RX26T is based on the RXv3 core. However, the current version of the Zephyr kernel
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only supports the RXv1 core. Since the RXv3 core is backward-compatible with RXv1, it works with this version.
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But the following limitations apply:
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- FPU context saving is not supported. Do not use the FPU.
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- Register bank save function is not supported. Do not use instructions for register bank save function.
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- Accumulator register saving is not supported. Do not use DSP instructions or any libraries that include DSP instructions.
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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 ``mcb_rx26t`` board target configuration can be
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built, flashed, and debugged as below.
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Currently, the Zephyr SDK hasn't added support for RX builds yet, so the GCC for RX toolchain is required and build system
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need to be set to use "cross-compile".
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- Download and install GCC for RX v8.3.0.202405 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 MCB-RX26T Type B:
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.. code-block:: console
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cd ~/zephyrproject/zephyr
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west build -p always -b mcb_rx26t samples/basic/blinky
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Flashing
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========
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Program can be flashed to MCB-RX26T via e2lite E2OB (Onboard debugger circuit).
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To flash the program to board
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1. Connect from board's debug connector port to host PC using USB connector for E2 OB.
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2. Execute west command
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.. code-block:: console
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west 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": "Renesas GDB Hardware Debugging",
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"target": {
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"deviceFamily": "RX",
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"device": "R5F526TF",
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"debuggerType": "E2LITE",
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"serverParameters": [
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"-uUseFine=", "1",
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"-w=", "1",
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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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- `MCB-RX26T Type B Website`_
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- `RX26T MCU group Website`_
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.. _MCB-RX26T Type B Website:
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https://www.renesas.com/en/design-resources/boards-kits/mcb-rx26t-type-b
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.. _RX26T MCU group Website:
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https://www.renesas.com/en/products/microcontrollers-microprocessors/rx-32-bit-performance-efficiency-mcus/rx26t-32-bit-microcontroller-optimized-dual-motor-and-pfc-control
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.. _MCB-RX26T Type B - User's Manual:
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https://www.renesas.com/en/document/mat/mcb-rx26t-type-b-users-manual
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.. _RX26T Group User's Manual Hardware:
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https://www.renesas.com/en/document/mah/rx26t-group-users-manual-hardware
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.. _Renesas Debug extension:
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https://marketplace.visualstudio.com/items?itemName=RenesasElectronicsCorporation.renesas-debug

‎boards/renesas/mcb_rx26t/doc/mcb_rx26t.webp

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‎boards/renesas/mcb_rx26t/mcb_rx26t-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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sci12_default: sci12_default {
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group1 {
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psels = <RX_PSEL(0x0C, 11, 5)>, /* TX - PB5 */
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<RX_PSEL(0x0C, 11, 6)>; /* RX - PB6 */
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};
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};
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};

‎boards/renesas/mcb_rx26t/mcb_rx26t.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/r5f526tfddfp.dtsi>
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#include <dt-bindings/gpio/gpio.h>
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#include "mcb_rx26t-pinctrl.dtsi"
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/ {
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model = "Renesas MCB-RX26T KIT";
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compatible = "renesas,mcb_rx26t","renesas,rxv3";
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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 = &uart12;
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zephyr,shell-uart = &uart12;
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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 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 = <&ioport2 0 GPIO_ACTIVE_LOW>;
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label = "LED2";
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};
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led3: led3 {
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gpios = <&ioport6 5 GPIO_ACTIVE_LOW>;
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label = "LED3";
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};
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led4: led4 {
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gpios = <&ioport6 4 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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led3 = &led4;
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};
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};
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&xtal {
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clock-frequency = <DT_FREQ_M(10)>;
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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_24>;
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status = "okay";
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};
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&cmt {
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clock-frequency = <60000000>;
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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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&ioport6 {
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status = "okay";
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};
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&sci12 {
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pinctrl-0 = <&sci12_default>;
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pinctrl-names = "default";
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status = "okay";
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uart12: uart {
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current-speed = <115200>;
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status = "okay";
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};
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};

‎boards/renesas/mcb_rx26t/mcb_rx26t.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: mcb_rx26t
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name: Renesas MCB-RX26T
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type: mcu
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arch: rx
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toolchain:
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- rxgcc
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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: 512

‎boards/renesas/mcb_rx26t/mcb_rx26t_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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