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manual:demos:nucleo_l073rz_cubeide

ARM-CM0+ STM32 Nucleo-L073RZ STM32CubeIDE

Supported firmware update interfaces

RS232 CAN USB TCP/IP SD-card Modbus RTU
Yes No No No No No

Development Environment

This demo is targeted towards the Nucleo-L073RZ board, with 192 kB internal Flash EEPROM and 20 kB internal RAM.

To program the bootloader into the internal flash, the on-board ST-Link debugger interface was used. Firmware updates via the serial communication port are preconfigured to use the virtual COM-port offered by the ST-Link. This means that no additional hardware is needed, besides a standard micro-USB cable.

To compile the demo programs you can use the STM32CubeIDE development environment. Note that STM32CubeIDE is cross-platform. The information outlined on this page applies to both Microsoft Windows and Linux users.

Workspace creation in STM32CubeIDE

Two demo projects are included in the OpenBLT bootloader package. One for the bootloader itself and one for the demo user program. This user program is configured such that it can be programmed, into the internal flash memory of the microcontroller, during a firmware update with the bootloader.

The first step in getting the the bootloader up-and-running, is the creation of the Eclipse workspace in STM32CubeIDE. After starting STM32CubeIDE, you are prompted to open a workspace. It is easiest to create a new one in the following directory: .\Target\Demo\ARMCM0_STM32L0_Nucleo_L073RZ_CubeIDE\

To import the demo programs into the workspace, select File → Import from the program menu. Then select General → Existing Projects into Workspace. On the next screen you select the following directory as the root directory: .\Target\Demo\ARMCM0_STM32L0_Nucleo_L073RZ_CubeIDE\. Eclipse will automatically find the Boot and Prog projects and select them:

Click the Finish button to complete the project import operation.

Building and programming the Bootloader

Before the bootloader can be used, it needs to be built and programmed into the STM32L073RZ's internal flash memory. The steps in this section only need to be done once.

  1. Set the project as the active project in Eclipse. This is achieved by clicking the Boot project in the Project Explorer to select it.
  2. Next, right-click the Boot project in the Project Explorer and select Refresh from the popup menu.
  3. Finally, right-click the Boot project in the Project Explorer and select Build Project from the popup menu to compile all the bootloader sources and link them together into the final executable.

The bootloader program is now ready to be programmed into the internal flash memory of the STM32L073RZ microcontroller. Make sure the Nucleo-L073RZ board is connected to your PC via a USB cable. Next, select Run → Debug from the menu to flash the bootloader program. This will launch the Debug perspective in Eclipse. Once done, you can start the bootloader program by selecting Run → Resume from the menu.

Alternatively, you can use your favorite programmer to flash the bootloader using one of the following files, depending on what file type your programmer supports:

  • \Target\Demo\ARMCM0_STM32L0_Nucleo_L073RZ_CubeIDE\Boot\Debug\openblt_stm32l073.elf
  • \Target\Demo\ARMCM0_STM32L0_Nucleo_L073RZ_CubeIDE\Boot\Debug\openblt_stm32l073.srec

Building the Demo Program

  1. Set the project as the active project in Eclipse. This is achieved by clicking the Prog project in the Project Explorer to select it.
  2. Next, right-click the Prog project in the Project Explorer and select Refresh from the popup menu.
  3. Finally, right-click the Prog project in the Project Explorer and select Build Project from the popup menu to compile all the user program sources and link them together into the final executable.

The output file is

  • \Target\Demo\ARMCM0_STM32L0_Nucleo_L073RZ_CubeIDE\Prog\Debug\demoprog_stm32l073.srec

Firmware update procedure

To download the demo program \Target\Demo\ARMCM0_STM32L0_Nucleo_L073RZ_CubeIDE\Prog\Debug\demoprog_stm32l073.srec using the bootloader, follow the instructions in the following links, depending on the communication interface you intend to use:

manual/demos/nucleo_l073rz_cubeide.txt · Last modified: 2023/12/04 22:34 by voorburg