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USB Bridge CAN Firmware Flashing

Firmware Compilation Quick Guide​

Important Notes​

  • 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 (Raspberry Pi official system, 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 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
YWhen exiting, press Y to save 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

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

  • make menuconfig is for compiling 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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  • Enter the Micro-controller Architecture menu, then select STMicroelectronics STM32 and press Enter.

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  • Enter the Processor model menu, select STM32F405, 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).

  • Follow the image to select CAN bus interface (CAN bus (on PB8/PB9)) --->.

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  • Press the Q key. When Save configuration appears, then press the Y key.
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  • The configuration should now be saved, and you should have exited to the command line interface.
  • Enter the command below to start compilation. This will take some time.
make -j4
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  • Finally, if the output below appears, the compilation is successful.
  • Due to Klipper version differences, as long as out/klipper.bin appears, it indicates success. 
    Linking out/klipper.elf
    Creating bin file out/klipper.bin

Firmware Flashing​

tip

Execute the following command to flash the firmware

fly-flash -d auto -h -f /data/klipper/out/klipper.bin
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Searching for CAN ID​

  1. Open a browser, enter the IP address of the host computer in the address bar, for example, if my host IP is 192.168.101.179, type it directly and press Enter.
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  1. Open the WEB interface of the host computer, find in the configuration options on the left sidebar:
  • For fluidd: {…} , click to enter, then find printer.cfg
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  • For mainsail: Machine, click to enter, then find printer.cfg
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  1. Click printer.cfg to enter, then click DEVICES in the top right corner.
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  1. Click CAN, then refresh.
  • Refresh in fluidd
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  • Refresh in mainsail
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  1. Copy the ID, click where the arrow points to copy.
  • In fluidd, confirm if the first arrow points to Klipper, if yes, click the copy button pointed by the right arrow.
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  • In mainsail, confirm if the first arrow points to Klipper, if yes, click the copy button pointed by the right arrow.
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Filling in the CAN ID​

  1. Close DEVICES and fill in the ID.
Important Notes
  • Please change in the configuration file:
[mcu] 
serial: /tmp/klipper_host_mcu

to

[mcu host] 
serial: /tmp/klipper_host_mcu
  • Add:
[mcu]
canbus_uuid: <Replace here with the ID you just queried>
  • Find [MCU] in fluidd
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  • Find [MCU] in mainsail
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  1. Fill the ID into the configuration.
tip
  • After filling in the ID, click SAVE & RESTART in the top right corner.
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  1. If Klipper prompts ADC out of range, this is normal. Connect the heated bed and thermistor to the mainboard, configure the thermistor pins for the nozzle and heated bed, then save and restart.
dangerous

Note: All IDs appearing in the document are examples. The actual ID for each mainboard is different; please fill in the ID you actually obtained.

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