USB Firmware Compilation

Check the DIP Switch

Notes

• During normal use, please set the DIP switch to the upward position
• When adjusting the switch, push it all the way up, otherwise the lower computer may not be detected!!!

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SSH to the Host Computer

Warning

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

• First, please: Connect to the Host Computer via SSH Using WiFi

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• USB Firmware Flashing
• Manually Compile USB Firmware

USB Firmware Flashing

Tip

• A pre-compiled USB firmware is already included in the FLYOS-FAST system, so manual firmware compilation is unnecessary. You can flash it by executing the command below.
• Alternatively, you can choose to manually compile the USB firmware if you prefer.

• Execute the following command via SSH connection to the host computer:

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

Below 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, while make menuconfig starts the firmware compilation. After execution, the following interface should appear:

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

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

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

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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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• For Communication interface, select: 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 will be back at the command line interface
• Enter the following command to start compilation. This may take some time.

make -j4

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• Compilation is successful if the following output appears at the end
• 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 following command to flash the firmware:

fly-flash -d auto -h -f /data/klipper/out/klipper.bin

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Searching for USB ID

1. Open a browser, enter the IP address of the host computer in the address bar. For example, if my host computer 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 find the following in the configuration options of the left sidebar:

For fluidd: {…}, click to enter, then you can find printer.cfg Loading...

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

3. Click printer.cfg to enter, then click DEVICES on the top right corner.

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4. Click SERIAL, then refresh.

Refresh in fluidd Loading...

Refresh in mainsail Loading...

5. Copy the ID, click on the arrow indicated to copy.

In fluidd, confirm whether ttyACM exists, and ensure that Path by ID is present. This is the USB ID. Loading...

In mainsail, confirm whether ttyACM exists, and ensure that Path by ID is present. This is the USB ID. Loading...

Filling in the USB ID

Danger

Please note that the ID below CANNOT be used!!!!

serial: /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0

1. Close DEVICES and fill in the ID.

Note

• In the configuration file, change:

[mcu] 
serial: /tmp/klipper_host_mcu

• to:

[mcu host] 
serial: /tmp/klipper_host_mcu

• And add:

[mcu]
serial: <Replace this with the ID you just queried>

Find [MCU] in fluidd Loading...

Find [MCU] in mainsail Loading...

2. Fill in the ID into the configuration.

Tip

• After filling in the ID, click SAVE & RESTART on 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 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.