USB Bridge CAN Firmware Flashing

SSH Connect to the Host

Warning

• Before compiling the firmware, you need to connect to the host via WiFi SSH

• First, please: Connect to the host via WiFi SSH

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

USB Bridge CAN Firmware Flashing

Tip

• A pre-compiled USB Bridge CAN firmware is already available in the FLYOS-FAST system, so manual firmware compilation is not required. You can flash it by executing the command below.
• Alternatively, you can choose 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 rate in the system configuration.

• This command flashes the 1M USB Bridge CAN Firmware

fly-flash -d auto -h -f /usr/lib/firmware/klipper/stm32h723-128k-usbcan-1m.bin

• This command flashes the 500k USB Bridge CAN Firmware

fly-flash -d auto -h -f /usr/lib/firmware/klipper/stm32h723-128k-usbcan-500k.bin

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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.

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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 cannot be used.

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

• Here, 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.

• Here, 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 the Enter key.

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

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• Navigate to the menu Processor model, select STM32H723, and press the Enter key.

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• Select Bootloader offset and choose: 128KiB bootloader.

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• Select Clock Reference (8 MHz crystal) and choose: 25 MHz crystal.

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

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• Press the Q key. Save configuration will appear. 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 following command to start compilation. It will 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, 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 command below 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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2. 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 Loading...

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

3. Click printer.cfg to enter, 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 pointed by the right arrow. Loading...

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

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 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 nozzle and heated bed, then save and restart.

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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.