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: Use WiFi to Connect to Host SSH

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• 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. Manual firmware compilation is not required; you can flash it by executing the commands below.
• Alternatively, you can choose to manually compile the USB Bridge CAN firmware.

• The FAST system defaults to a 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/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

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

• 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, then Save configuration appears. At this point, press the Y key.
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• The configuration should now be saved, and you should have exited back to the command line interface.
• Enter the following command to start compilation. This 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, the appearance of out/klipper.bin alone 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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Search for CAN ID

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

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

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

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

3. After clicking into printer.cfg, click on 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 arrow to copy it.

   In fluidd, confirm whether the item pointed to by the first arrow is Klipper; if so, click the arrow on the right to copy it. Loading...

   In mainsail, confirm whether the item pointed to by the first arrow is Klipper; if so, click the arrow on the right to copy it. Loading...

Fill in 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 this with the ID you just looked up>

In fluidd, find [MCU] Loading...

In mainsail, find [MCU] 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 shows a message ADC out of range, this is normal. Connect the heated bed and thermistor to the mainboard, and configure the thermistor pins for the extruder and heated bed, then save and restart.

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Note: All IDs shown in the documentation are examples. Each mainboard has a different ID, so please fill in the actual ID you obtained.

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