RX26T Motor Control Board

Overview

MCB-RX26T Type B is a CPU board for motor control evaluation. By using this product in combination with an inverter board, motor control using RX26T can be easily performed.

MCU Native Pin Access

The MCB-RX26T Type B includes:

  • CPU maximum operating frequency 120MHz, 32-bit RXv3 Core

  • Package/Pin count: LFQFP/100 pin

  • ROM/RAM: 512KB/64KB

  • MCU input clock: 10MHz (Generate with external crystal oscillator)

System Control and Debugging

  • Power supply: DC 5V,3.3V (selectable with jumper switch) Select one way automatically from the below

    • USB-powered (debug port)

    • External power supply via standard input

  • Debugging support:

    • Via E2lite debugger with E2OB (Onboard debugger circuit) - open Jumper J11

    • Via JLink with JTAG connector - short Jumper J11

  • Connector:

    • Inverter board connector

    • USB connector for E2 OB

    • SCI connector for Renesas Motor Workbench communication

    • Through hole for CAN communication

    • Through hole for SPI communication

    • PMOD connectors

  • User LEDs and buttons:

    • Four User LEDs

    • Power LED indicating availability of regulated power

    • One Reset button

Hardware

Detailed hardware features can be found at:

Note: The CPU used in the RX26T is based on the RXv3 core. However, the current version of the Zephyr kernel only supports the RXv1 core. Since the RXv3 core is backward-compatible with RXv1, it works with this version. But the following limitations apply:

  • FPU context saving is not supported. Do not use the FPU.

  • Register bank save function is not supported. Do not use instructions for register bank save function.

  • Accumulator register saving is not supported. Do not use DSP instructions or any libraries that include DSP instructions.

Supported Features

The mcb_rx26t board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

Programming and Debugging

The mcb_rx26t board supports the runners and associated west commands listed below.

flash debug

Applications for the mcb_rx26t board can be built, flashed, and debugged using standard Zephyr workflows. Refer to Building an Application and Run an Application for more details.

Note: Currently, the RX26T is built and programmed using the Renesas GCC RX toolchain. Please follow the steps below to program it onto the board:

export ZEPHYR_TOOLCHAIN_VARIANT=cross-compile
export CROSS_COMPILE=<Path/to/your/toolchain>/bin/rx-elf-

  • Build the Blinky Sample for EK-RX26T

cd ~/zephyrproject/zephyr
west build -p always -b mcb_rx26t@typeb samples/basic/blinky

Flashing

Program can be flashed to MCB-RX26T via e2lite E2OB (Onboard debugger circuit).

To flash the program to board

  1. Connect from board’s debug connector port to host PC using USB connector for E2 OB.

  2. Execute west command

west flash

Debugging

You can use Renesas Debug extension on Visual Studio code for a visual debug interface. The configuration for launch.json is as below.

{
  "version": "0.2.0",
  "configurations": [
      {
          "type": "renesas-hardware",
          "request": "launch",
          "name": "Renesas GDB Hardware Debugging",
          "target": {
              "deviceFamily": "RX",
              "device": "R5F526TF",
              "debuggerType": "E2LITE",
              "serverParameters": [
                  "-uUseFine=", "1",
                  "-w=", "1",
              ],
          }
      }
  ]
}

References