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USB Bridge CAN Firmware Flashing

Connecting to the Host​

Core Connection Limitation

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

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Brief Guide to Firmware Compilation​

Notes​

  • Network: Ensure the host (Raspberry Pi, etc.) is connected to the internet.
  • Login Method: Must log in via SSH over the network; serial port access 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.

Switch User:​

  • Standard System (Official Raspberry Pi system, etc.)
    Do not use root; switch to a regular user: 
    su <username>
  • FLY Host System (FlyOS-FAST system)
    Only supports login as root user (password: mellow)

Firmware Compilation Operation Guide​

In the Klipper firmware configuration interface, only keyboard operations are supported; the mouse cannot be used.

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

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 removes previous compilation data and firmware

  • make menuconfig compiles the firmware, after execution the following interface should appear

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

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

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  • Enter 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 return to the command line interface
  • Enter the following command to start compilation, it will take some time
make -j4
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  • The following output at the end indicates successful compilation
  • Due to Klipper version issues, as long as out/klipper.bin appears, it indicates success 
    Linking out/klipper.elf
    Creating bin file out/klipper.bin

Entering Flashing Mode​

  • Connect the motherboard to the host using a Type-C cable, then double-click the RST button. At this point, the LED on the motherboard will blink.
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Flashing the Firmware​

Starting the Flashing Process​

  • Non-Fly official upper computers require Katapult installation
  • Install Katapult

Obtaining the Mainboard ID​

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

ls /dev/serial/by-id/*

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

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Flashing the Firmware​

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

Flashing Process Reference:

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Flashing Success Reference:

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Firmware Update​

USB Firmware Update Steps​

  1. Query the Mainboard ID
ls /dev/serial/by-id/*
Identification Points

/dev/serial/by-id/usb-katapult_rp2040_E662549553642032-if00 in the image below is the mainboard ID

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

Method One: Quickly Enter Flash Mode​

  1. Power off the mainboard
  2. After powering back on, quickly double-click the RESET button
  3. Re-enter flash mode

Method Two: Re-flash the Katapult Firmware​

Click to View Katapult Firmware Flashing Guide

Searching for CAN ID After Flashing​

After the firmware is flashed and the motherboard is powered on again, proceed to search for the CAN ID.

View CAN ID Retrieval Method

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