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Flash Closed Loops Boards

This new firmware improves motor resonance and fixes much of the salmon skin encountered on the stock firmware. It's the same firmware used on S1 Pro and it's recommended to update.

Although it is possible to flash the firmware without having the Dupont cable provided in the Silent Kit, for the sake of simplicity this is what we will cover here.

Prerequisites

Note

If you want to restore stock firmware for Closed Loops Boards use this firmware:
closed_loop_board_fw_stock.bin

Note

You can skip this step if you have already installed the utility.

  • Extract STM32_ST-LINK_Utility_v4.6.0.zip file and run STM32 ST-LINK Utility v4.6.0.exe installer.

  • Click on Next button:

  • Click on Yes button:

  • Click on Next button:

  • Click on Finish button:

  • A new window appears, click on Next button to install required drivers:

  • Then, click on Finish button:

Procedure

  • Make sure your printer is turned off and unplug the 3 cables from the Closed Loops Board:

  • Install Dupont connection cable to the printed STL Tool file and connect it to ST-LINK V2 Programmer:

    Warning

    Note that the colors of 3.3V and GND on the Dupont cable provided by FLSUN are reversed.

    Not all STM32 Programmers (especially clones) have the same pin positions.
    Make sure to match the pins on the SMT32 Programmer with those on the Dupont cable.

  • Place the printed STL Tool file like this and make sure the board touches the bottom of the model:

  • Connect the ST-LINK V2 Programmer to a USB port on your computer.

  • Start STM32 ST-LINK Utility and click on Connect to target button:

    If you have this message, it means the Dupont connector is not making contact with the Closed Loop Board, try « playing » with the tool until you get the connection:

    If you have this message, it means that the drivers for STM32 Programmer are not installed:

  • If the connection is correct, you should get this:

  • Click on File → Open file... and select closed_loop_board_fw.bin firmware file:

  • Then, click on Program verify button:

  • Make sure this information are the same, click Start button and wait for the firmware to be written:

  • If the firmware is written successfully, the following message will appear:

  • You can now disconnect from target by clicking on Disconnect button:

  • You can now unplug the ST-LINK V2 Programmer from your computer and remove the tool from the Closed Loops Board.

  • Reconnect the 3 cables to the Closed Loops Board and repeat this process for the other two boards.

Note

In case you did not buy the Silent Kit, you can still flash the Closed Loops Boards by following this connection diagram but you will need to find a way to keep the cables in contact:

Warning

Not all STM32 Programmers (especially clones) have the same pin positions.
Make sure to match the pins on the SMT32 Programmer with those on the Closed Loop Board.


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