USB Bridge CAN Firmware Burning

SSH Connection to Host Machine

Warning

• Before compiling the firmware, you need to use WiFi connection to connect to the host machine via SSH

• First, please: Use WiFi to Connect to Host Machine SSH

---

USB Bridge CAN Firmware Burning

USB Bridge CAN Firmware Burning

Tip

• A pre-compiled USB Bridge CAN firmware is available in the FLYOS-FAST system, so there's no need to manually compile the firmware; just run the following commands to burn it.
• Alternatively, you can choose to manually compile the USB Bridge CAN firmware and compile the firmware yourself.

• Carefully select based on your device; the FLY system defaults to 1M.

• The C5 system defaults to 1M baud rate; if you need 500K, you'll need to modify the canbus_bitrate in the system settings.

• This command burns the 1M USB Bridge CAN firmware.

fly-flash -d c5 -h -f /usr/lib/firmware/klipper-h723-128k-usbcan-1m.bin

• This command burns the 500k USB Bridge CAN firmware.

fly-flash -d c5 -h -f /usr/lib/firmware/klipper-h723-128k-usbcan-500k.bin

Manually Compile USB Bridge CAN Firmware

Manually Compile USB Bridge CAN 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 Q key, a Save configuration prompt will appear, then press Y key

• Now the configuration should be saved, and you should have exited to the command line interface

• Enter make -j4 to start compiling, it takes some time

• If the output is as follows, compilation is successful

---

Firmware Burning

tip

Run the following command to burn the firmware

sudo fly-flash -d c5 -h -f ~/klipper/out/klipper.bin

---

Search for CAN ID

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

   

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

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

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

   3. Click printer.cfg, then click DEVICES on the top right
   4. Click CAN, then refresh

   Refresh for fluidd

   Refresh for mainsail

   5. Copy the ID, click the arrow to copy

   For fluidd, confirm whether the first arrow points to Klipper, if yes, click the right arrow to copy

   For mainsail, confirm whether the first arrow points to Klipper, if yes, click the right arrow to copy

Fill in CAN ID

1. Close DEVICES and fill in the ID

Note

• Please modify the following content in the configuration file:

[mcu] 
serial: /tmp/klipper_host_mcu

to

[mcu host] 
serial: /tmp/klipper_host_mcu

• Add:

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

Find [MCU] in fluidd

Find [MCU] in mainsail

2. Fill in the ID in the configuration

tip

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

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

dangerous

Note: All IDs mentioned in the document are examples. Each motherboard has a different ID. Please fill in the actual obtained ID.

---