USB Firmware Compilation

Check the DIP Switch

Note

For normal use, please set the DIP switch to the up position
When switching, make sure to push it all the way up, otherwise the lower controller may not be connected!!!

SSH Connection to the Upper Controller

Warning

Before firmware compilation, you need to connect to the upper controller via SSH using WiFi

First, please: Connect to the Upper Controller via SSH Using WiFi

USB Firmware Flashing
Manually Compile USB Firmware

USB Firmware Flashing

Tip

The FLYOS-FAST system comes with a pre-compiled USB firmware, so there is no need to manually compile it. You can flash it by executing the command below
Alternatively, you can choose to manually compile the USB firmware

Connect to the upper controller via SSH and enter the following command

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

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.

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)

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:

Loading...
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)

Loading...

Press the Q key, when Save configuration appears, then press the Y key
Loading...
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

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

HID Flashing Failure Prompt

If the prompt shown in the image below appears, please follow the steps below to troubleshoot:

Confirm that the DIP switch is in the correct position
If the DIP switch is correct but flashing still fails, please refer to BL Firmware Flashing

Searching for USB ID

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.

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

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

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

Click SERIAL, then refresh.

Refresh in fluidd

Refresh in mainsail

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.

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

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

Close DEVICES and fill in the ID.

Note

In the configuration file, change:

[mcu] 
serial: /tmp/klipper_host_mcu

[mcu host] 
serial: /tmp/klipper_host_mcu

And add:

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

Find [MCU] in fluidd

Find [MCU] in mainsail

Fill in the ID into the configuration.

Tip

After filling in the ID, click SAVE & RESTART on the top right corner.

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.

Check the DIP Switch​

SSH Connection to the Upper Controller​

USB Firmware Flashing​

Brief Guide to Firmware Compilation​

Notes​

SSH Login and User Switching​

Switch User:​

Firmware Compilation Operation Guide​

Firmware Flashing​

HID Flashing Failure Prompt​

Searching for USB ID​

Filling in the USB ID​