OpenBLT Bootloader

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====== ARM-CM0 STM32 Nucleo-G0B1RE STM32CubeIDE ======

===== Supported firmware update interfaces =====

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

===== Development Environment =====

{{:manual:demos:stm32_nucleo_g0b1re.png? |}}

This demo is targeted towards the [[https://www.st.com/en/evaluation-tools/nucleo-g0b1re.html|Nucleo-G0B1RE]] board, with 512 kB internal Flash EEPROM and 144 kB internal RAM.

To compile the demo programs you can use the [[https://www.st.com/en/development-tools/stm32cubeide.html|STM32CubeIDE]] development environment. Note the STM32CubeIDE is cross-platform. The information outlined on this page applies to both Microsoft Windows and Linux users.

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.

===== 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 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_STM32G0_Nucleo_G0B1RE_CubeIDE\

{{:manual:demos:nucleo_g0b1re_cubeide_workspace_creation.png?550|}}

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_STM32G0_Nucleo_G0B1RE_CubeIDE\. Eclipse will automatically find the **Boot** and **Prog** projects and select them:

{{:manual:demos:nucleo_g0b1re_cubeide_project_import.png?600|}}

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 STM32G0B1RE's internal flash memory. The steps in this section only need to be done once.

  - Set the project as the active project in Eclipse. This is achieved by clicking the **Boot** project in the //Project Explorer// to select it.
  - Next, right-click the **Boot** project in the //Project Explorer// and select //Refresh// from the popup menu.
  - 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 STM32G0B1RE microcontroller. Make sure the Nucleo-G0B1RE 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_STM32G0_Nucleo_G0B1RE_CubeIDE\**Boot**\Debug\**openblt_stm32g0b1.elf**
  * \Target\Demo\ARMCM0_STM32G0_Nucleo_G0B1RE_CubeIDE\**Boot**\Debug\**openblt_stm32g0b1.srec**


===== Building the Demo Program =====

  - Set the project as the active project in Eclipse. This is achieved by clicking the **Prog** project in the //Project Explorer// to select it.
  - Next, right-click the **Prog** project in the //Project Explorer// and select //Refresh// from the popup menu.
  - 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_STM32G0_Nucleo_G0B1RE_CubeIDE\**Prog**\Debug\**demoprog_stm32g0b1.srec**

===== Firmware update procedure =====

To download the demo program \Target\Demo\ARMCM0_STM32G0_Nucleo_G0B1RE_CubeIDE\**Prog**\Debug\**demoprog_stm32g0b1.srec** using the bootloader, follow the instructions in the following links, depending on the communication interface you intend to use:

  * [[manual:rs232_demo|Firmware updates using the RS232 communication interface]]
  * [[manual:can_demo|Firmware updates using the CAN communication interface]]
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