USB Bridge CAN Firmware Flashing

SSH Connect to Host

Warning

Before compiling firmware, use Wi-Fi to connect to the host SSH

First: Use Wi-Fi to connect to host SSH

USB Bridge CAN Firmware Flashing
Manually Compile USB Bridge CAN Firmware

USB Bridge CAN Firmware Flashing

Note

The FLYOS-FAST system comes with a pre-compiled USB Bridge CAN firmware; no need to manually compile the firmware. Execute the command below to flash.
You can also choose to Manually compile USB Bridge CAN firmware if preferred.

FAST system defaults to 1M rate; for 500K, modify the canbus_bitrate in the system configuration.
This command flashes the 1M USB Bridge CAN firmware

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

This command flashes the 500k USB Bridge CAN firmware

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

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.

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)

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:

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.
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 (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
2Micro-controller Architecture 选择 STMicroelectronics STM32
(Top)
Klipper Firmware Configuration
[*] Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
3Processor model 选择 STM32H723
(Top)
Klipper Firmware Configuration
[*] Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
4Bootloader offset 选择 128KiB bootloader
(Top)
Klipper Firmware Configuration
[*] Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
5Clock Reference 选择 25 MHz crystal
(Top)
Klipper Firmware Configuration
[*] Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
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 (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
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 (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
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 (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
9CAN bus speed 设置为 1000000
(Top)
Klipper Firmware Configuration
[*] Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
10GPIO 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 (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
11GPIO 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 (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
12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 (STM32H723) --->
Bootloader offset (128KiB bootloader) --->
Clock Reference (25 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
() GPIO pins to set at micro-controller startup
GPIO state at micro-controller startup (Not set) --->
13出现 Save configuration 时按 Y 保存配置
Quit
Save configuration?
(Y)es(N)o(C)ancel
After completing the last two steps above, press Q to exit the configuration interface, then press Y to save the configuration.
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/stm32/usbotg.o
Compiling out/src/generic/canserial.o
Compiling out/src/../lib/fast-hash/fasthash.o
Compiling out/src/stm32/fdcan.o
Compiling out/src/stm32/chipid.o
Compiling out/src/generic/usb_canbus.o
Compiling out/src/stm32/hard_pwm.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 following command to flash the firmware

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

HID Flashing Failure Prompt

If the prompt shown in the image below appears, please follow the steps below to troubleshoot:

Confirm that the DIP switch is in the correct position
If the DIP switch is correct but flashing still fails, please refer to BL Firmware Flashing

Search CAN ID

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.

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

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

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

Click CAN, then refresh.

Fluidd refresh

Mainsail refresh

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.

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

Fill in the CAN ID

Close DEVICES and fill in the ID.

Note

Please change the following in the configuration file:

[mcu] 
serial: /tmp/klipper_host_mcu

[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 at the top right.

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.

SSH Connect to Host​

USB Bridge CAN Firmware Flashing​

Brief Guide to Firmware Compilation​

Notes​

SSH Login and User Switching​

Switch User:​

Firmware Compilation Operation Guide​

Starting Firmware Compilation​

Firmware Flashing​

HID Flashing Failure Prompt​

Search CAN ID​

Fill in the CAN ID​

SSH Connect to Host

USB Bridge CAN Firmware Flashing

Brief Guide to Firmware Compilation

Notes

SSH Login and User Switching

Switch User:

Firmware Compilation Operation Guide

Starting Firmware Compilation

Firmware Flashing

HID Flashing Failure Prompt

Search CAN ID

Fill in the CAN ID