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

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USB Bridge CAN Firmware Flashing

USB Bridge CAN Firmware Flashing

Tip

• The FLYOS-FAST system has a pre-compiled USB Bridge CAN firmware, so manual compilation is not required. Execute the command below to flash.
• You can also choose Manual Compilation of USB Bridge CAN Firmware to compile the firmware yourself.

• 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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Manual Compilation of USB Bridge CAN Firmware

Firmware Compilation Notes and Operation Guide

Notes

📌 Important Prerequisites

1. Network Connection: Ensure the host machine (Raspberry Pi, etc.) is connected to the network.
2. Access Method: You must log in to the host machine via SSH over the network. Using serial port tools is prohibited.
3. User Permissions: Use the correct user account for operations based on the host machine's system type.
4. Input Method: Ensure the keyboard input method is set to Half-width mode (English mode).

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SSH Login and User Switching

SSH Login to Host Machine

Use an SSH tool (such as MobaXterm, PuTTY, etc.) to log in to the host machine over the network: View Detailed SSH Connection Tutorial

Switching Users Based on System Type

Standard Host Machine (Armbian)

Applicable Systems:

• Official Raspberry Pi OS
• FLY Pi Armbian System
• Other systems with Klipper installed

User Permission Requirements:

• Do not use the root user for any operations.
• You must switch to a standard user for operations.

Switch Command:

• Other systems (replace <username> with your username)

  su <username>

💡 Tip

Standard users typically have the necessary compilation permissions. Using the root user may cause permission issues.

FAST System (FlyOS-FAST)

Applicable Systems:

• FlyOS-FAST System

Login Information:

• Username: root
• Password: mellow

⚠️ Important

The FAST system only has the root user.

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Firmware Compilation Instructions

1. Keyboard Operation Guide

• On the Klipper firmware configuration page, you can only use the following shortcut keys:
• You cannot use the mouse directly!

Key	Function Description
↑ ↓ Arrow Keys	Move the cursor up/down to select menu items.
Enter or Space	Confirm selection/check menu item or enter submenu.
ESC	Return to the previous menu level.
Q	Exit the Klipper firmware configuration page.
Y	When prompted upon exit, press Y to save the configuration.

Show Hidden Options

⚠️ Show Hidden Options

If there are few options on the configuration page, first check:

[ ] Enable extra low-level configuration options

This option is used to display some hidden configuration options.

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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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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