Скачать или смотреть How to Successfully Flash the Bootloader on an STM32F4 with OpenOCD Using Raspberry Pi 4

Discover effective steps to `flash the bootloader` on an STM32F4 board using OpenOCD on Raspberry Pi 4, ensuring smooth operation without errors.
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Flashing the Bootloader on STM32F4 with OpenOCD on Raspberry Pi 4

If you're venturing into programming an STM32F4 microcontroller, particularly for use in projects like a 3D printer controller board, you may find yourself confronting some unique challenges. One common hurdle is how to successfully flash the bootloader onto your STM32F4 board, such as the Makerbase Robin Nano v3. In this guide, we'll explore a specific issue that many encounter and walk through the solution step-by-step.

The Challenge

In this setup, the user is attempting to write to an STM32F407 microcontroller using OpenOCD on a Raspberry Pi 4 but is running into problems when trying to write to memory locations. Despite successfully reading from memory, any write attempts are met with failure messages.

The user detailed an attempt to execute WRITE commands, resulting in unchanged memory values, and various commands that failed to write the bootloader image to the microcontroller.

Key Issues Identified:

Write attempts to internal memory appear to fail.

The error messages indicate internal memory write issues and potential bootloader locking.

The setup seems correct but lacks proper write functionality.

Understanding the Solution

Fortunately, there's a straightforward solution to this issue. The solution involves using specific commands within OpenOCD to erase the memory sector and write the desired firmware image correctly to the STM32F4 microcontroller.

Step-by-step Fix

1. Erase the Memory Sector:
To begin, you need to erase the memory sector of the microcontroller where you're trying to write the bootloader. The command for this is:

[[See Video to Reveal this Text or Code Snippet]]

This command clears the specific bank of flash memory, ensuring that you're starting fresh for the write process. Usage of the parameters is crucial here:

The first 0 refers to the first bank of flash.

The second 0 indicates the first sector in the bank.

The 11 denotes the specific sector that needs erasing.

2. Write the Bootloader Image:
After successfully erasing the memory sector, the next step is to write the bootloader binary file into that now-empty bank. Use the following command to perform this action:

[[See Video to Reveal this Text or Code Snippet]]

In this command:

0 refers to the bank number where the image will be written.

nano_v3_bootloader.bin is the binary file you want to write onto the STM32F4.

The final 0 signifies the starting address (offset) in the bank.

Final Thoughts

By following the above steps—erasing the memory sector first and then writing the bootloader to the STM32F4—you should resolve the writing issue you encountered initially. It is crucial to use the specific commands to ensure proper communication between the Raspberry Pi 4 and the STM32F4 microcontroller via OpenOCD.

If you encounter any further issues, make sure to double-check the OpenOCD configuration files for discrepancies, and ensure that your wiring setup is secure, especially the connections for power and signal between your Raspberry Pi and STM32F4 board.

Engaging with these processes not only bolsters your programming skills but also enriches your understanding of ARM microcontrollers.

Conclusion

Navigating the intricacies of programming STM32F4 boards using tools like OpenOCD can be daunting, but overcoming these challenges is part of the learning curve. Now that you have the roadmap to successfully flash your STM32F4 bootloader, you're one step closer to bringing your 3D printer (or any microcontroller project) to life. Happy coding!