Create a Renesas e2 Studio project

This topic provides you step-by-step instructions to create a Renesas e2 studio project, and integrate application and platform sources.

The following instructions guide you through the complete process:

Create e2 studio project and configure the FSP

  1. Launch e2 studio and create a new project for RA6M3G using File > New > Renesas C/C++ Project > Renesas RA.
    • Select C++ as the project language and click Next.
    • Select Executable and FreeRTOS and click Next.
    • Select FreeRTOS - Minimal – Static Allocation as the project template. Follow the wizard and complete the steps to create the project.
  2. Configure the FSP Stacks as described in the Renesas RA6M3G FSP configuration topic.

Export platform sources

  1. Run the following command to export the platform sources:
    export QUL_ROOT=/path/to/QtMCUs/2.8.0
    $QUL_ROOT/bin/qmlprojectexporter --platform-metadata $QUL_ROOT/lib/QulPlatformTargets_<PLATFORM_NAME>-export.json --outdir <DESTINATION_FOLDER> --project-type cmake --no-export-qml
    set QUL_ROOT=C:\path\to\QtMCUs\2.8.0
    %QUL_ROOT%\bin\qmlprojectexporter.exe --platform-metadata %QUL_ROOT%\lib\QulPlatformTargets_<PLATFORM_NAME>-export.json --outdir <DESTINATION_FOLDER> --project-type cmake --no-export-qml
  2. Import the exported platform sources into a top level directory named platform. To import the platform sources into the project,
    • Create a new folder named platform under the project
    • Right click on folder name and go to Import -> File System.
    • On the Import dialog box, browse the platform sources folder.
    • Select all source and header files except FreeRTOSConfig.h and linker file ek-ra6m3g.ld, which are already generated by the e2 studio.
    • Open platform/boards/renesas/ek-ra6m3g-freertos/platform_config.h and comment out #define QUL_ENABLE_PERFORMANCE_LOGGING to disable performance logging.

    Note: To enable performance logging, you must have uxTaskGetStackHighWaterMark() function enabled and QUL_STACK_SIZE defined with a value that matches the stack size of Qt Quick Ultralite application task (24576 by default).

Develop application backend

  1. Create UI communicator struct

    The backend enables the application's UI to communicate with the platform and get the required information from the hardware. In this case, the communicator gets the status of the on-board LED. The following diagram describes the workflow between the two components:

    • Right click source folder in the Project Explorer and select New > Class.
    • Put UICommunicator in the Class name field. Rename the Header and Source to uicommunicator.h and uicommunicator.cpp respectively and click Finish.
    • Open uicommunicator.h and change it to look like the following:
      #ifndef UICOMMUNICATOR_H
      #define UICOMMUNICATOR_H
      #include <qul/singleton.h>
      #include <qul/property.h>
      #include <qul/eventqueue.h>
      struct UICommunicator : public Qul::Singleton<UICommunicator>
          friend struct Qul::Singleton<UICommunicator>;
          enum Command { LED1State };
          Qul::Property<bool> led1Status;
          void sendFromUI(Command command, bool commandData);
          void receiveToUI(Command command, bool commandData);
          UICommunicator(const UICommunicator &);
          UICommunicator &operator=(const UICommunicator &);
      struct CommandEvent
          UICommunicator::Command command;
          bool commandData;
      class CommandEventQueue : public Qul::EventQueue<struct CommandEvent, Qul::EventQueueOverrunPolicy_Discard, 10>
          void onEvent(const CommandEvent &commandEvent);
      #endif // UICOMMUNICATOR_H

      The header declares the UICommunicator struct, which inherits Qul::Singleton, enabling easy integration with UI code. For more information, refer to Singleton class reference. The header also declares the Command enumeration that has a list of commands, and the CommandEventQueue to manage the queue. Use enumeration to establish communication between the UI and the application. The header also declares the led1Status property to indicate the status of the on-board LED. This property is exposed to the QML context, which uses it to determine the color of the button. The UICommunicator class also has the sendFromUI and receiveToUI functions to send and receive commands. In addition, use the CommandEventQueue to communicate with the UI thread in a thread-safe way. Instead of calling receiveToUI from the application thread, add the commands to the CommandEventQueue, which is then processed by the QUL thread to call receiveToUI.

    • Open uicommunicator.cpp and change it to look like the following:
      #include "uicommunicator.h"
      extern void sendCommandToAppThread(bool led1Status);
      void UICommunicator::sendFromUI(Command command, bool commandData)
      void UICommunicator::receiveToUI(Command command, bool commandData)
          switch (command) {
          case LED1State:
      void CommandEventQueue::onEvent(const CommandEvent &commandEvent)
          UICommunicator::instance().receiveToUI(commandEvent.command, commandEvent.commandData);
      static CommandEventQueue commandEventQueue;
      void sendToUI(bool led1Data)
          CommandEvent commandEvent;
          commandEvent.command = UICommunicator::LED1State;
          commandEvent.commandData = led1Data;

      The UICommunicator class initializes led1Status to false. Its sendFromUI() member function sends a boolean value containing the LED’s new state to the application thread. The receiveToUI() member function uses the command argument to find if the property requires an update. Next, the CommandEventQueue class overrides the onEvent() function. This function overrides calls receiveToUI() on the UICommunicator instance, with the command and commandData parameters. In addition, create a static instance of CommandEventQueue for the sendToUI() function to post events. The function constructs a CommandEvent from the given boolean value and adds it to the commandEventQueue for processing. The sendToUI() gets called from application thread when the LED’s state changes.

Export UI sources

  1. Change YourProject.qmlproject file to add interface file, uicommunicator.h, created in earlier step.
    InterfaceFiles {
        files: ["/path/to/uicommunicator.h"]
  2. Export the UI sources using the qmlprojectexporter tool.
    export QUL_ROOT=/path/to/QtMCUs/2.8.0
    export QMLPROJECT_FILE=/path/to/YourProject.qmlproject
    export BOARDDEFAULTS=$QUL_ROOT/platform/boards/renesas/ek-ra6m3g-freertos/cmake/BoardDefaults_16bpp.qmlprojectconfig
    $QUL_ROOT/bin/qmlprojectexporter $QMLPROJECT_FILE --platform=ek-ra6m3g-freertos --toolchain=GCC --boarddefaults=$BOARDDEFAULTS --outdir=$APPLICATION_EXPORT_DIR
    set QUL_ROOT=C:\path\to\QtMCUs\2.8.0
    set QMLPROJECT_FILE=C:\path\to\YourProject.qmlproject
    set BOARDDEFAULTS=%QUL_ROOT%\platform\boards\renesas\ek-ra6m3g-freertos\cmake\BoardDefaults_16bpp.qmlprojectconfig
    %QUL_ROOT%\bin\qmlprojectexporter.exe %QMLPROJECT_FILE% --platform=ek-ra6m3g-freertos --toolchain=GCC --boarddefaults=%BOARDDEFAULTS% --outdir=%APPLICATION_EXPORT_DIR%
  3. Import the UI sources into the ui_sources top-level directory. To import the UI sources into the project,
    • Right-click on project name in Project Explorer.
    • Go to New -> Folder.
    • On the New Folder wizard, click on Advanced and select Link to alternate location.
    • Browse the <DESTINATION_FOLDER>\ui_sources folder, generated in the earlier step.
    • Click Finish.

Configure e2 studio project

  1. Open C/C++ Project Settings. Right-click on the project in the Project Explorer and choose Properties from the context menu to make the following changes:
    • Add the platform and ui_sources folders to the project's source locations. Right-click on the project in the Project Explorer and select Properties, then select C/C++ General > Paths and Symbols > Source Location.
    • Add include paths from IDE-Import-Instructions.txt to the C++ include directories list under C/C++ General > Paths and Symbols > Includes. Check Add to all configurations and Add to all languages. For this application, add the following include directories:
      • <QUL_ROOT>/include
      • <QUL_ROOT>/src/3rdparty/qoi
      • <QUL_ROOT>/src/3rdparty/nanopb
      • <QUL_ROOT>/src/3rdparty/minihdlc
      • <PROJECT_LOC>/platform/boards/renesas/ek-ra6m3g-freertos
      • <PROJECT_LOC>/platform/boards/renesas/ek-ra6m3g-common
      • <PROJECT_LOC>/ui_sources
    • Add the following libraries to the C/C++ Build > Settings > Tool Settings > GNU Arm Cross C++ Linker > Libraries list:
      • Add the following from <Qt-install-dir>/QtMCUs/<QUL-version>/lib:
        • libQulMonotypeUnicode_cortex-m4-hf-fpv4-sp-d16_Linux_armgcc _MinSizeRel.a
        • libQulMonotypeUnicodeEngineShaperDisabled_cortex-m4-hf-fpv4 -sp-d16_Linux_armgcc_MinSizeRel.a
        • libQulPNGDecoderLodePNG_cortex-m4-hf-fpv4-sp-d16 _Linux_armgcc_MinSizeRel.a
        • libQulCore_cortex-m4-hf-fpv4-sp-d16_Linux_armgcc_MinSizeRel.a
        • libQulDeviceLink_ek-ra6m3g-freertos_Linux_armgcc_MinSizeRel.a

      Note: The %APPLICATION_EXPORT_DIR%\config\YourProject.1.libraries.txt file lists the Qt Quick Ultralite libraries that an application should link against.

    • Set the C++ language standard to GNU ISO 2014 C++ under C/C++ Build > Settings > Tool Settings > Gnu Arm Cross C++ Compiler > Optimization. Select the Do not use exceptions, Do not use RTTI, and Do not use thread-safe statics options.

      Note: Apply these settings to all project configurations.

    • Add ucHeap=__HeapBase preprocessor definition under C/C++ Build > Settings > Tool Settings > GNU Arm Cross C Compiler.

      Note: This enables FreeRTOS use the heap that is usually reserved for std malloc. Ensure that your project does not use std mallocs or move FreeRTOS heap. The current RA6 FreeRTOS platform port uses FreeRTOS pvPortMalloc(), so it needs a sizable part of RAM to work. You can change this behavior by overriding the functions in platform/mem-freertos.cpp.

  2. Edit script/fsp.ld and append the following code:
    QulModuleResourceData :
    . = ALIGN(4);
    __qspi_flash_start__ = .;
    } > QSPI_FLASH
    QulFontResourceData :
    . = ALIGN(4);
    } > QSPI_FLASH
    QulResourceData :
    . = ALIGN(4);
    *(QulResourceData) . = ALIGN(4);
    __qspi_flash_end__ = .;
    } > QSPI_FLASH
    PROVIDE(__defaultTotalHeapSize = 102400);
  3. Edit src/hal_entry.cpp to insert the following code in the R_BSP_WarmStart() function definition. It enables the S1 button on the board.
    R_ICU_ExternalIrqOpen(&g_S1_irq_ctrl, &g_S1_irq_cfg);

    Note: This code should be inside the BSP_WARM_START_POST_C if block, right after R_IOPORT_Open().

  4. Edit app_thread_entry.cpp to replace the code with the following:
    #include "app_thread.h"
    extern void sendToUI(bool led1Data);
    void app_thread_entry(void *pvParameters)
        bool led1State;
        while (true) {
            // Wait for an event from the user interface
            if (pdTRUE == xQueueReceive(g_app_queue, (void *) &led1State, portMAX_DELAY)) {
                bsp_io_level_t level;
                level = led1State ? BSP_IO_LEVEL_HIGH : BSP_IO_LEVEL_LOW;
                R_BSP_PinWrite(BSP_IO_PORT_04_PIN_03, level); // blue LED on EK-RA6M3
    static bool led1Level = false;
    extern "C" void s1_irq_callback(external_irq_callback_args_t *p_args)
        uint32_t level = R_BSP_PinRead(BSP_IO_PORT_04_PIN_03); // blue LED on EK-RA6M3
        led1Level = !(level & 0x01);
        xQueueSendFromISR(g_app_queue, &led1Level, NULL);

    The first line declares sendToUI extern symbol. Next, the app_thread_entry() function uses a simple while loop, waiting for an item on g_app_queue. When it finds an item (a bool value) on the queue, it toggles (on/off) the blue LED1 based on the item value. Finally, it sends the change notification to the UI thread.

    The last function is the callback for s1 interrupt defined in the FSP configuration. It checks the LED1 status and adds the inverse value to the g_app_queue, to toggle the LED1 depending on its earlier state.

  5. Edit qul_thread_entry.cpp and replace the existing code with the following:
    #include "qul_thread.h"
    #include <qsg_ui.h>
    #include <qul/application.h>
    #include <qul/qul.h>
    #include <platforminterface/log.h>
    #include <FreeRTOS.h>
    #include <task.h>
    extern "C" {
    void vApplicationStackOverflowHook(TaskHandle_t xTask, signed char *pcTaskName)
        (void) xTask;
        (void) pcTaskName;
    void vApplicationMallocFailedHook(void)
    void qul_thread_entry(void *pvParameters)
        Qul::Application _qul_app;
        static struct ::qsg_ui _qul_item;
    static bool ledEvent = false;
    void sendCommandToAppThread(bool led1Status)
        ledEvent = led1Status;
        xQueueSend(g_app_queue, &ledEvent, 0);

    The qul_thread_entry() function starts the Qt Quick Ultralite UI in the given thread. Call the sendCommandToAppThread() function from the UI code, to get the requested led1Status and post it to g_app_queue. qul_thread_entry() creates application instance and serves as an entry point to process loop of Quick Ultralite.

Your application is now ready. Build and flash it to the RA6M3G board to test that everything works as intended. Next, you can try experimenting with the code. For example, configure an interrupt for the S2 button and implement a callback to toggle LED2 and update the LED's status in the UI.

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