STM32L4R9I-DISCO Starting Instructions
- STM32L4R9AII6 MCU featuring ARM® Cortex®-M4, 2-MBytes Flash, 640-kbytes RAM
- 1.2” 390x390 round Touch Display
- 16-Mbit PSRAM memory
- 512-Mbit Octo-SPI Flash memory
- Ensure that the common STM prerequisites are met.
- Install CubeL4 SDK 1.15.1 and create the
STM32Cube_FW_L4_SDK_PATHenvironment variable (Download)
- Download STMCubeL4 1.15.0 and Patch_CubeL4 1.15.1, and run them in that order
- Create the
STM32Cube_FW_L4_SDK_PATHenvironment variable and set its value to:
where, <STM32_CUBE_L4_INSTALL_PATH> points to the CubeL4 SDK install directory.
The package for
STM32L4R9I_DISCO board comes with a prebuilt watch demo binary. You can find it in the
See Flashing Instructions for ST boards, for information about flashing the device.
For this board, select MX25LM51245G_STM32L4R9I-DISCO as the external loader.
Qt for MCUs provides the source code of several demos and examples. You can modify, build, and flash custom binaries onto the target device.
Source code for supported demos and examples is organized in the following directory structure:
The following example builds the
watch demo for this board:
cd %Qul_DIR%\demos\watch mkdir build cd build cmake .. -G "Ninja" -DCMAKE_BUILD_TYPE=Debug -DCMAKE_TOOLCHAIN_FILE=%Qul_DIR%\lib\cmake\Qul\toolchain\armgcc.cmake -DQUL_PLATFORM=STM32L4R9I-DISCOVERY cmake --build .
Once you have successfully built the
watch demo, you can flash it from command line:
cmake --build . --target flash_watch
The same procedure applies to any other application.
Note: By default, the asset data for application is copied to RAM on application startup. In order to keep resources in external flash, and not load it to RAM on startup, use the QUL_COPY_TO_RAM cmake option with the value
Never when adding assets to the application with qul_add_resource.
If your license provides access to the Qt Quick Ultralite sources, build it with all of supported demos/examples. Run the following commands from the terminal window:
cd %Qul_DIR% mkdir build cd build cmake .. -G "Ninja" -DCMAKE_BUILD_TYPE=Debug -DCMAKE_TOOLCHAIN_FILE=..\lib\cmake\Qul\toolchain\armgcc.cmake -DQUL_GENERATORS=..\lib\cmake\Qul\QulGenerators.cmake -DQUL_PLATFORM=STM32L4R9I-DISCOVERY
Once Qt Quick Ultralite is built successfully, you can flash the supported demos/examples from command line.
cmake --build . --target flash_<DEMO_OR_EXAMPLE_NAME>
DEMO_OR_EXAMPLE_NAME is the name of a supported demo/example.
This section describes how to build an application, using a custom Qt Quick Ultralite build.
- First, you must set up the development environment as described earlier.
- Build Qt Quick Ultralite from the modified sources and install it to a custom location.
mkdir some\path\custom_builds\qul cd some\path\custom_builds\qul mkdir qul-build cd qul-build cmake <PATH_TO_INSTALLED_QT_SDK>\QtMCUs\<version> \ -G "Ninja" \ -DCMAKE_INSTALL_PREFIX=some\path\custom_builds\qul \ -DCMAKE_BUILD_TYPE=Release \ -DCMAKE_TOOLCHAIN_FILE=<PATH_TO_INSTALLED_QT_SDK>\QtMCUs\<version>\lib\cmake\Qul\toolchain\armgcc.cmake \ -DQUL_PLATFORM=<PLATFORM_NAME> \ -DQUL_BUILD_TESTS=OFF \ -DQUL_BUILD_DEMOS=OFF \ -DQUL_BUILD_EXAMPLES=OFF \ -DQUL_GENERATORS=<PATH_TO_INSTALLED_QT_SDK>\QtMCUs\<version>\lib\cmake\Qul\QulGenerators.cmake \ ninja install
- Use the custom Qt Quick Ultralite to build your application, which is not part of the Qt Quick Ultralite source tree:
cd some\path\custom_builds mkdir app # Put your application here. You can use the redbutton example from the SDK. cd app mkdir build cd build set QUL_DIR=some\path\custom_builds\qul cmake .. \ -G "Ninja" \ -DCMAKE_BUILD_TYPE=Release \ -DCMAKE_TOOLCHAIN_FILE=some\path\custom_builds\qul\lib\cmake\Qul\toolchain\armgcc.cmake \ -DQUL_GENERATORS=<PATH_TO_INSTALLED_QT_SDK>\QtMCUs\<version>\lib\cmake\Qul\QulGenerators.cmake \ -DQUL_PLATFORM=<PLATFORM_NAME> \ ninja ninja flash_<YOUR_APP_NAME>
By default, the output of
printf calls are redirected to a virtual serial port, which is exposed on the host machine via USB.
- Open terminal window and run the following command:
ST-LINK_gdbserver.exe -cp "<STM32_CUBE_PROG_INSTALL_PATH>\bin"
<STM32_CUBE_PROG_INSTALL_PATH>is the directory where you've installed the Cube Programmer tool.
GDB Server is now listening for TCP connections on the default port,
Note: Actual TCP port used by
ST-LINK_gdbserveris printed out on gdbserver's console.
arm-none-eabi-gdbin a separate console
- Connect to the target via the gdbserver in the
(gdb) target remote 127.0.0.1:61234
ST-LINK_gdbserver requires up-to-date ST-LINK firmware to be installed. If you see the following error:
Error in initializing ST-LINK device. Reason: ST-LINK firmware upgrade required.
you must upgrade the firmware to the latest version using the STM32CubeProgrammer tool.
If the problem persists after upgrade, retry with
ST-LINK Upgrade tool from the ST webpage ( Download ).
STM32L4R9AII6 MCU does not have double precision floating point support. Care should be taken to avoid using them.
Available under certain Qt licenses.
Find out more.