USB Bridge CAN Firmware Flashing

Firmware Compilation Quick Guide

Precautions

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.

Use tools like MobaXterm, PuTTY, etc., to SSH into the host machine.

Switching Users:

Standard Systems (Official Raspberry Pi OS, 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 cursor up/down to select menu items
Enter / Space	Confirm selection, toggle options, or enter submenus
ESC	Return to the previous menu level
Q	Exit the configuration interface
Y	When exiting, press Y to save the configuration if prompted

Start Firmware Compilation

Below is 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 interface below should appear.

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

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

Loading...
Enter the menu Processor model, select STM32F405, and press Enter.

Loading...
Select Bootloader offset, choose: 32KiB bootloader.

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

Loading...

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

make -j4

Finally, if the output shows the following content, 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 following command to flash the firmware

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

Searching for CAN ID

Open your browser, enter the IP address of the host computer in the address bar, for example, if my host IP is 192.168.101.179, just type it and press Enter.

Open the host's WEB interface, find in the configuration options in the left sidebar:

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

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

Click into printer.cfg, then click DEVICES in the top right corner.

Click CAN, then refresh.

Refresh in fluidd

Refresh in mainsail

Copy the ID, click where the arrow points to copy.

In fluidd, confirm if the first arrow points to Klipper. If yes, click the copy button indicated by the right arrow.

In mainsail, confirm if the first arrow points to Klipper. If yes, click the copy button indicated by the right arrow.

Filling in the CAN ID

Close DEVICES and fill in the ID.

Important Notes

In the configuration file, change:

[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 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 top 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 hotend and heated bed, then save and restart.

dangerous

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​

Precautions​

SSH Login and User Switching​

Switching Users:​

Firmware Compilation Operation Guide​

Start Firmware Compilation​

Firmware Flashing​

Searching for CAN ID​

Filling in the CAN ID​