USB Bridge CAN Firmware Flashing

Firmware Compilation Quick Guide

Notes

Network: Ensure the host machine (Raspberry Pi, etc.) is connected to the network.
Login Method: Must use SSH to log in via the network; disable serial port.
Input Method: Keep the keyboard in English half-width mode.

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).

Firmware Compilation Operation Guide

In the Klipper firmware configuration interface, only keyboard operations are supported; mouse usage is not possible.

Key	Function
↑ / ↓	Move the cursor up/down to select menu items
Enter / Space	Confirm selection, toggle options, or enter submenus
ESC	Return to the previous menu
Q	Exit the configuration interface
Y	When exiting, press Y if prompted to save the configuration

Start Firmware Compilation

The following describes how to compile the firmware:

After connecting to SSH, enter the command below 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 the previous compilation data and firmware.
make menuconfig is for compiling the firmware. After execution, the interface below should appear:

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Select Enable extra low-level configuration options and press Enter.

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Navigate to the Micro-controller Architecture menu and select STMicroelectronics STM32, then press Enter.

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Go to the Processor model menu, select STM32F405, and press Enter.

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Select Bootloader offset and choose: 32KiB bootloader.

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Select Communication interface and choose: USB to CAN bus bridge (USB on PA11/PA12).
As shown in the image, select CAN bus interface (CAN bus (on PB8/PB9)) --->.

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Press the Q key. When Save configuration appears, press the Y key.
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The configuration should now be saved, and you will exit to the command line interface.
Enter the command below to start the compilation. This process may take some time.

make -j4

The compilation is successful if the following content is output.
Due to Klipper version differences, the appearance of out/klipper.bin 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

Search for CAN ID

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

Open the WEB interface of the host computer. In the configuration options on the left sidebar, find:

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

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

Click printer.cfg to enter, then click DEVICES in the upper right corner.

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Click CAN, then refresh.
Refresh in fluidd

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Refresh in mainsail

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Copy the ID. Click the indicated arrow to copy.

In fluidd, ensure the first arrow points to Klipper. If yes, click the arrow on the right to copy.

In mainsail, ensure the first arrow points to Klipper. If yes, click the arrow on the right to copy.

Fill in the CAN ID

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  

Add:

[mcu]  
canbus_uuid: <Replace here with the ID you just queried>  

Find [MCU] in fluidd

Find [MCU] in mainsail

Fill the ID into the configuration.

Tip

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

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

Danger

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

Firmware Compilation Quick Guide​

Notes​

SSH Login and User Switching​

Switching Users:​

Firmware Compilation Operation Guide​

Start Firmware Compilation​

Firmware Flashing​

Search for CAN ID​

Fill in the CAN ID​