USB Bridge CAN Firmware Flashing

SSH into the Host

Warning

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

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

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

USB Bridge CAN Firmware Flashing

Tip

• The FLYOS-FAST system comes with a pre-compiled USB Bridge CAN firmware. Manual compilation is not required; you can flash the firmware by executing the command below.
• Alternatively, you can choose to Manually Compile USB Bridge CAN Firmware to compile the firmware yourself.

• The FAST system defaults to a 1M baud rate. 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

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.

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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 (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).

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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 cursor up/down to select menu items
Enter / Space	Confirm selection, toggle options, or enter submenus
ESC	Return to the previous menu level
Q	Exit the configuration interface
Y	When 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

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 your browser, enter the IP address of the host computer in the address bar, for example, if my host IP is 192.168.101.179, just type it and press Enter.

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2. Open the host's WEB interface, find in the configuration options in the left sidebar:

For fluidd: {…} , click into it to find printer.cfg Loading...

For mainsail: Machine, click into it to find printer.cfg Loading...

3. Click into printer.cfg, then click DEVICES in the top right corner.

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4. Click CAN, then refresh.

Refresh in fluidd Loading...

Refresh in mainsail Loading...

5. 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 indicated by the right arrow. Loading...

In mainsail, confirm if the first arrow points to Klipper. If yes, click the copy button indicated by the right arrow. Loading...

Filling in the CAN ID

1. Close DEVICES and fill in the ID.

Important Notes

• In the configuration file, change:

[mcu] 
serial: /tmp/klipper_host_mcu

to:

[mcu host] 
serial: /tmp/klipper_host_mcu

• Add:

[mcu]
canbus_uuid: <Replace this 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 top 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 hotend and heated bed, then save and restart.

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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.