USB Bridge CAN Firmware Flashing

SSH Connect to Host

Warning

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

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

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

USB Bridge CAN Firmware Flashing

Tip

• FLYOS-FAST system has pre-compiled a USB Bridge CAN firmware; no need to manually compile. Execute the command below to flash.
• Alternatively, you can choose to manually compile the USB Bridge CAN firmware.

• The FAST system defaults to 1M baud rate. If 500K is needed, 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/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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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.

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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)

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Firmware Compilation Operation Guide

In the Klipper firmware configuration interface, only keyboard operations are supported; the 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	If prompted when exiting, press Y to save the configuration

Starting 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

• Where rm -rf ~/klipper/.config && rm -rf ~/klipper/out removes the previous compilation data and firmware

• make menuconfig compiles the firmware; after execution, the interface shown below should appear

• Where rm -rf ~/klipper/.config && rm -rf ~/klipper/out removes the previous compilation data and firmware, make menuconfig compiles the firmware; after execution, the interface shown below should appear

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• Select Enable extra low-level configuration options, press the Enter key

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

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• Enter the menu Processor model, select STM32H723, press the Enter key

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• Select Bootloader offset, choose: 128KiB bootloader

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

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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, then 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 the compilation; it will take a while

make -j4

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• Finally, the following output indicates a successful compilation
• Due to different Klipper versions, the appearance of out/klipper.bin alone signifies 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 CAN ID

1. Open the browser, enter the host computer's IP address in the address bar. For example, if my host computer's IP is 192.168.101.179, directly input it and press Enter.

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2. Open the WEB interface of the host computer, and in the sidebar's configuration options, 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 at the top right.

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4. Click CAN, then refresh.

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Mainsail refresh Loading...

5. Copy the ID by clicking where the arrow points.

For fluidd, confirm if the first arrow points to Klipper. If so, click the copy button indicated by the right arrow. Loading...

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

Fill in the CAN ID

1. Close DEVICES and fill in the ID.

Note

• Please change the following 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 at the top right.

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3. If Klipper prompts ADC out of range, this is normal. Connect the heated bed and thermistor to the motherboard, configure the thermistor pins for the nozzle and heated bed, then save and restart.

Danger

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