USB Bridge CAN Firmware Flashing

SSH Connect to the Upper Computer

Warning

• Before compiling the firmware, you need to connect to the upper computer SSH via WiFi

• First, please: Connect to the upper computer SSH via WiFi

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• USB Bridge CAN Firmware Flashing
• Manually Compile USB Bridge CAN Firmware

USB Bridge CAN Firmware Flashing

Note

• In the FLYOS-FAST system, a USB bridge CAN firmware has been pre-compiled. No need to manually compile the firmware. Execute the command below to flash it.
• You can also choose to manually compile the USB bridge CAN firmware and compile it yourself.

• The FAST system defaults to a 1M rate. If 500K is needed, modify the canbus_bitrate rate in the system configuration.

• This command flashes the 1M USB Bridge CAN Firmware

fly-flash -d auto -h -f /usr/lib/firmware/klipper/stm32f407-32k-usbcan-1m.bin

• This command flashes the 500k USB Bridge CAN Firmware

fly-flash -d auto -h -f /usr/lib/firmware/klipper/stm32f407-32k-usbcan-500k.bin

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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.

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SSH Login and User Switching

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)

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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

Starting Firmware Compilation

Below is an introduction on how to compile the firmware:

1. Connect 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 is used to clear previous compilation configurations and firmware; make menuconfig is used to open the Klipper firmware configuration interface.

2. Follow the order below to set each item one by one, completing each before moving on to the next.

   1启用 Enable extra low-level configuration options

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   2Micro-controller Architecture 选择 STMicroelectronics STM32

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   3Processor model 选择 STM32F407

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   4Bootloader offset 选择 32KiB bootloader

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   5Clock Reference 选择 8 MHz crystal

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   6Communication interface 选择 USB to CAN bus bridge (USB on PA11/PA12)

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   7CAN bus interface 选择 CAN bus (on PB8/PB9)

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   8USB ids 保持默认，无需进入

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   9CAN bus speed 设置为 1000000

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   10启用 Optimize stepper code for 'step on both edges'

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   11GPIO pins to set at micro-controller startup 保持为空

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   12GPIO state at micro-controller startup 选择 Not set

   此项是 FLYOS-Klipper 功能。通常保持 Not set；如需设置全部 GPIO 的启动状态，请先阅读 GPIO 启动状态使用说明。

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   13按 Q 键退出配置界面

   (Top)

   Klipper Firmware Configuration

   [*] Enable extra low-level configuration options

   Micro-controller Architecture (STMicroelectronics STM32) --->

   Processor model (STM32F407) --->

   Bootloader offset (32KiB bootloader) --->

   Clock Reference (8 MHz crystal) --->

   Communication interface (USB to CAN bus bridge (USB on PA11/PA12)) --->

   CAN bus interface (CAN bus (on PB8/PB9)) --->

   USB ids --->

   (1000000) CAN bus speed

   [*] Optimize stepper code for 'step on both edges'

   () GPIO pins to set at micro-controller startup

   GPIO state at micro-controller startup (Not set) --->

   [Space/Enter] Toggle/enter[?] Help[/] Search

   [Q] Quit (prompts for save)[Esc] Leave menu

   14出现 Save configuration 时按 Y 保存配置

   Quit

   Save configuration?

   (Y)es(N)o(C)ancel

3. After completing the last two steps above, press Q to exit the configuration interface, then press Y to save the configuration.

4. Return to the command line and enter the following command, then press Enter to start compiling:

   make -j4

   root@flyos-11e5f8 ~/klipper # make -j4

   Compiling out/src/generic/canserial.o

   Compiling out/src/../lib/fast-hash/fasthash.o

   Compiling out/src/stm32/can.o

   Compiling out/src/stm32/chipid.o

   Compiling out/src/generic/usb_canbus.o

   Compiling out/src/stm32/hard_pwm.o

   Compiling out/src/stm32/sdio.o

   Preprocessing out/src/generic/armcm_link.ld

   Building out/compile_time_request.o

   Version: XXXX

   Linking out/klipper.elf

   Creating bin file out/klipper.bin

   终端末尾出现 Linking out/klipper.elf 和 Creating bin file out/klipper.bin，即表示编译成功。 实际编译时，部分 Compiling 行和 Version 会随 Klipper 与系统版本变化。

Firmware Flashing

Tip

Execute the command below to flash the firmware.

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

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Search CAN ID

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

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2. Open the WEB interface of the host computer, and in the sidebar's configuration options, find:

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

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

3. Click printer.cfg to enter, then click DEVICES at the top right.

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4. Click CAN, then refresh.

Fluidd refresh Loading...

Mainsail refresh Loading...

5. Copy the ID by clicking where the arrow points.

For fluidd, confirm if the first arrow points to Klipper. If so, click the copy button indicated by the right arrow. Loading...

For mainsail, confirm if the first arrow points to Klipper. If so, click the copy button indicated by the right arrow. Loading...

Fill in the 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 here with the ID you just queried>

Find [MCU] in fluidd Loading...

Find [MCU] in mainsail Loading...

2. Fill the ID into the configuration.

Tip

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

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3. 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.