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USB Bridge CAN Firmware Flashing

Connecting to the Host Computer​

Core Connection Limitation

The Fly-D8 mainboard can only communicate with the host computer for Klipper via the Type-C USB interface.

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Firmware Compilation Quick Guide​

Precautions​

  • Network: Ensure the host machine (Raspberry Pi, etc.) is connected to the network.
  • Login Method: Must log in via SSH over the network; serial port login is disabled.
  • Input Method: Keep the keyboard in English half-width mode.

SSH Login and User Switching​

Use tools like MobaXterm, PuTTY, etc., to SSH into the host machine.

Switching Users:​

  • Standard Systems (Official Raspberry Pi OS, etc.)
    Do not use root. Switch to a regular user: 
    su <username>
  • FLY Host Machine (FlyOS-FAST System)
    Only supports logging in as the root user (password: mellow).

Firmware Compilation Operation Guide​

In the Klipper firmware configuration interface, only keyboard operations are supported; mouse usage is not possible.

KeyFunction
↑ / ↓Move cursor up/down to select menu items
Enter / SpaceConfirm selection, toggle options, or enter submenus
ESCReturn to the previous menu level
QExit the configuration interface
YWhen exiting, press Y to save the configuration if prompted

Start Firmware Compilation​

The following describes how to compile the firmware:

  • After connecting via SSH, enter the following command and press Enter:

    cd ~/klipper && rm -rf ~/klipper/.config && rm -rf ~/klipper/out && make menuconfig

  • rm -rf ~/klipper/.config && rm -rf ~/klipper/out deletes previous compilation data and firmware.

  • make menuconfig compiles the firmware. After execution, the interface below should appear.

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  • Select Enable extra low-level configuration options and press Enter.

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  • Navigate to the Micro-controller Architecture menu, then select STMicroelectronics STM32 and press Enter.

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  • Navigate to the Processor model menu, select STM32F407, and press Enter.

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  • Select Bootloader offset, choose: 32KiB bootloader.

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  • Select Communication interface, choose: USB to CAN bus bridge (USB on PA11/PA12).

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  • Press the Q key. When Save configuration appears, press the Y key.
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  • The configuration should now be saved, and you should exit back to the command line interface.
  • Enter the command below to start compilation. This process may take some time.
make -j4
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  • The compilation is successful if the following content is output at the end.
  • Due to Klipper version differences, the appearance of out/klipper.bin alone indicates success. 
    Linking out/klipper.elf
    Creating bin file out/klipper.bin

Entering Flashing Mode​

  • After connecting the mainboard to the host computer using a Type-C data cable, double-click the RST button. At this point, the LED on the mainboard will flash.
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Flashing the Firmware​

Start Flashing​

  • Non-FLY official host computers require Katapult installation
  • Install Katapult

Obtain Board ID​

Execute the following command to search for the device ID. Under normal circumstances, an ID similar to the one shown in the image below should be displayed (Note: Each board has a different ID):

ls /dev/serial/by-id/*

If the searched ID contains usb-katapult_stm32xxxxxxxx, it indicates you can proceed to the next step.

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Flash Firmware​

⚠️ Preparations
  • Ensure the firmware file has been compiled.
  • Replace <Your Board ID> in the command below with the actual ID obtained in the previous step.
  • For regular host computers, use the following code: 
    ~/klippy-env/bin/python ~/katapult/scripts/flashtool.py -d <Your Board ID>
  • For FLY host computers, use the following code: 
    python3 ~/katapult/scripts/flashtool.py -d <Your Board ID>

Flashing Process Reference:

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Successful Flashing Reference:

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Firmware Update​

USB Firmware Update Steps​

  1. Query Board ID
ls /dev/serial/by-id/*
Key Identification Point

In the image below, /dev/serial/by-id/usb-katapult_rp2040_E662549553642032-if00 is the board ID.

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  1. Update Firmware
cd ~/klipper/ && make flash FLASH_DEVICE=<Your Board ID>
Note
  • Replace <Your Board ID> with the actual ID you queried.
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Solutions for Flashing Incorrect Firmware​

Method 1: Quickly Enter Flashing Mode​

  1. Power off the board.
  2. After powering on again, quickly double-click the RESET button.
  3. Re-enter flashing mode.

Method 2: Re-flash Katapult Firmware​

Click to view Katapult Firmware Flashing Guide
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