USB Bridge CAN Firmware Flashing

SSH Connection to the Host Computer

Warning

• Before compiling the firmware, you need to connect to the host computer via SSH using Wi-Fi.

• First, please: Use Wi-Fi to Connect to the Host Computer via SSH

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• USB Bridge CAN Firmware Flashing
• Manually Compile USB Bridge CAN Firmware

USB Bridge CAN Firmware Flashing

Note

• The FLYOS-FAST system comes with a pre-compiled USB bridge CAN firmware, so manual compilation is not required. You can flash the firmware by executing the commands below.
• Alternatively, you can choose to manually compile the USB bridge CAN firmware and compile it yourself.

• The default baud rate for the FAST system is 1M. If you need 500K, you need to modify the canbus_bitrate in the system configuration.

• This command flashes the 1M USB bridge CAN firmware:

fly-flash -d auto -h -f /usr/lib/firmware/klipper/stm32f407-32k-usbcan-1m.bin

• This command flashes the 500k USB bridge CAN firmware:

fly-flash -d auto -h -f /usr/lib/firmware/klipper/ststm32f407-32k-usbcan-500k.bin

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Firmware Compilation Quick Guide

Notes

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

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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).

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Firmware Compilation Operation Guide

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

Key	Function
↑ / ↓	Move the cursor up/down to select menu items
Enter / Space	Confirm selection, toggle options, or enter submenus
ESC	Return to the previous menu
Q	Exit the configuration interface
Y	When exiting, press Y if prompted 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

• 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 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 will exit back to the command line interface.
• Enter the following command to start compilation. This process may take some time.

make -j4

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• If the following content is output at the end, the compilation is successful.
• Due to Klipper version differences, the appearance of out/klipper.bin alone 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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Search for CAN ID

1. Open a browser, enter the IP address of the host computer in the address bar. For example, if the host IP is 192.168.101.179, simply type it in and press Enter.

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2. Open the WEB interface of the host computer. In the configuration options on the left sidebar, find:

For fluidd: {…}, click to enter, then find printer.cfg Loading...

For mainsail: Machine, click to enter, then find printer.cfg Loading...

3. Click printer.cfg to enter, then click DEVICES in the upper right corner.

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4. Click CAN, then refresh.

   Refresh in fluidd Loading...

   Refresh in mainsail Loading...

5. Copy the ID. Click the indicated arrow to copy.

   In fluidd, ensure the first arrow points to Klipper. If yes, click the arrow on the right to copy. Loading...

   In mainsail, ensure the first arrow points to Klipper. If yes, click the arrow on the right to copy. Loading...

Fill in the CAN ID

1. Close DEVICES and fill in the ID.

Note

• In the configuration file, change:

[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 Loading...

Find [MCU] in mainsail Loading...

2. Fill the ID into the configuration.

Tip

• After filling in the ID, click SAVE & RESTART in the upper right corner.

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3. 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.

Danger

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

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