USB to CAN Bridge Firmware Flashing

SSH into the Host Machine

Warning

• Firmware compilation requires connecting to the host machine's SSH via Wi-Fi before proceeding

• First, please: Connect to the host machine's SSH via Wi-Fi

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USB to CAN Bridge Firmware Flashing

USB to CAN Bridge Firmware Flashing

Tip

• A USB to CAN bridge firmware has already been pre-compiled in the FLYOS-FAST system, there is no need to manually compile the firmware, just execute the commands below to flash
• Alternatively, you can choose to manually compile the USB to CAN bridge firmware

• The FAST system defaults to 1M bitrate, if you need 500K, you must change the canbus_bitrate bitrate in the system configuration

• This command flashes the 1M USB to CAN bridge firmware

fly-flash -d auto -h -f /usr/lib/firmware/klipper/stm32h723-128k-usbcan-1m.bin

• This command flashes the 500K USB to CAN bridge firmware

fly-flash -d auto -h -f /usr/lib/firmware/klipper/stm32h723-128k-usbcan-500k.bin

Manually Compile USB to CAN Bridge Firmware

Manually Compile USB to CAN Bridge Firmware

Klipper Firmware Compilation and Configuration Page Operation Instructions

tip

Please ensure that the keyboard input method is in half-width mode, i.e., English mode.

1. The up arrow key ↑, down arrow key ↓ are used to move the cursor up and down to select menu items.
2. The confirm key Enter or space key Space is used to check the menu or enter a sub-menu.
3. The exit key ESC is used to return to the previous menu.
4. The Q key is used to exit the Klipper firmware configuration page.
5. The Y key, when exiting the Klipper firmware configuration page and there is a prompt, click the Y key to save the configuration file.

warning

If there are fewer options in the configuration page, please first check [ ] Enable extra low-level configuration options to display some hidden options.

Below is the introduction on how to compile the firmware:

• After connecting to SSH, enter the following command and press Enter:

  cd ~/klipper && rm -rf ~/klipper/.config && rm -rf ~/klipper/out && make menuconfig

• Where rm -rf ~/klipper/.config && rm -rf ~/klipper/out is to delete previous compilation data and firmware, make menuconfig is to compile the firmware, after execution, the following interface should appear

  

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

  

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

  

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

  

• Select Bootloader offset, select: 128KiB bootloader

  

• Select Clock Reference (8 MHz crystal), select: 25 MHz crystal

  

• Select Communication interface, select: USB to CAN bus bridge (USB on PA11/PA12)

  

• Press the Q key, when Save configuration appears, press the Y key

• Configuration should now be saved and you will exit back to the command line interface

• Enter the command below to begin compiling, this might take some time

make -j4

• The compilation was successful if the output ends with the following message

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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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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.

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

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

3. After clicking into printer.cfg, click on DEVICES in the upper right corner.

4. Click CAN, then refresh.

   Refresh in fluidd

   Refresh in mainsail

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.

   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.

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]

In mainsail, find [MCU]

2. Fill the ID into the configuration

tip

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

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.

dangerous

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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