Katapult Firmware

Katapult Firmware Description

Tip

Katapult was originally named CanBoot, and later renamed to Katapult

Katapult firmware is a type of bootloader that can be used in conjunction with Klipper. After flashing via DFU or similar methods, one-click firmware updates can be performed using commands.
Advantages: Quickly double-press the reset button or power cycle twice to enter Katapult firmware, during which the LED on the motherboard will blink.
Katapult firmware can only be used to flash firmware and cannot connect to Klipper!!!
Katapult firmware supports three methods for connecting to the host machine, with each method’s firmware being independent of the others:
- CAN connection
  - Advantages: After compiling the Klipper firmware, it can be updated directly using commands; strong anti-interference capability.
  - Disadvantages: The firmware compilation speed must be known in advance.
- RS232 connection
  - Advantages: After compiling the Klipper firmware, it can be updated using commands; very strong anti-interference capability.
  - Disadvantages: One-click firmware updates via commands are not possible; manual entry into Katapult firmware is required.
- USB connection
  - Advantages: After compiling the Klipper firmware, it can be updated directly using commands.
  - Disadvantages: Long data cables are prone to interference, potentially causing disconnection.

Tip

All three MMU types are supported
Only CAN firmware and USB firmware are provided here

Entering Flash Mode

Tip

The top is the RESET button, the bottom is the BOOT button

There are two methods to enter flash mode
First method: With the tool board completely powered off, hold the BOOT button, then connect one end of the TYPE-C cable (with data transfer capability) to the board and the other end to your device
Second method: After connecting one end of the TYPE-C cable (with data transfer capability) to the board and the other end to your device, hold the BOOT button, press the RST button, then release the RST button, and finally release the BOOT button
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Flashing Firmware

Windows Flashing Tutorial
Host Flashing Tutorial

MMU Katapult firmware
You can obtain the firmware via the following links:

Download firmware package - Directly download the latest firmware archive
Repository address - Access the firmware repository

The firmware is located at

FLY-Firmware/ToolBoard/MMU

Notice

To ensure successful STM32 flashing, please note the following:

The USB port on some computers may cause unstable flashing due to driver or signal compatibility issues. It is recommended to try a different USB port for connection.
If changing ports does not work, an effective solution is to connect via an external USB hub, which often improves compatibility.
When the flashing software reports the error shown below, please also prioritize trying a USB hub. If the issue persists, check or use the host computer for flashing.
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Flashing tool Download Link
You need to download SetupSTM32CubeProgrammer and STM32 DFU Driver
Download the firmware to any directory on your computer
Connect the motherboard to the computer using a Type-C cable, ensuring it has entered dfu flashing mode
In STM32CubeProgrammer, select USB mode, refresh, and connect
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If no error popup appears, the connection is successful.
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Click the download icon on the left and check the following options
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Click Browse as indicated by the arrow, then select the firmware you need to flash
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Set Start address to 0x08000000
- Note: If the firmware is in HEX format, please skip this step!!
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Click Start automatic mode below to begin flashing the firmware
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The following prompt indicates that the firmware flashing is complete
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Install the Flashing Tool

This step is not required for FLY host computers.
If installation is needed, ensure the host computer is connected to the internet.
If the flashing tool has already been installed, this step can be skipped.

sudo apt update
sudo apt install dfu-util -y

Check Device Connection Status

Execute the following command to confirm whether the device is successfully connected:

lsusb

If the DFU device is not recognized, try re-entering flashing mode.
In some system versions, the device name may differ. As long as 0483:df11 appears, it indicates successful entry into flashing mode.

Obtain Precompiled Firmware

Below are the precompiled firmware files. Please select the corresponding command to download based on your system type (ensure the host computer has internet access).

For standard systems:

cd && git clone https://cnb.cool/3dmellow/FLY-Firmware.git 

For FLY host computers:

git clone https://cnb.cool/3dmellow/FLY-Firmware.git /data/FLY-Firmware
ln -s /data/FLY-Firmware /root/FLY-Firmware

If the firmware package has already been downloaded, it is recommended to update it to the latest version before proceeding:
```
cd ~/FLY-Firmware && git pull
```

The previous repository is no longer maintained. If you need to delete it, execute:
```
rm -rf ~/FLY_Katapult /root/FLY_Katapult
```

Flashing Firmware

Tip

Only one of the firmware files needs to be flashed

Below is the flashing command for 500K CAN rate firmware

sudo dfu-util -a 0 -d 0483:df11 --dfuse-address 0x08000000 -D ~/FLY-Firmware/ToolBoard/MMU/FLY_MMU_CANBOOT_CAN_500K.bin

Below is the flashing command for 1M CAN rate firmware

sudo dfu-util -a 0 -d 0483:df11 --dfuse-address 0x08000000 -D ~/FLY-Firmware/ToolBoard/MMU/FLY_MMU_CANBOOT_CAN_1M.bin

Below is the flashing command for USB firmware

sudo dfu-util -a 0 -d 0483:df11 --dfuse-address 0x08000000 -D ~/FLY-Firmware/ToolBoard/MMU/FLY_MMU_CANBOOT_USB.bin

Flashing is successful when the message File downloaded successfully appears as shown below

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Tip

After flashing, the board must be completely powered off once.

Verifying Firmware Startup

If the firmware starts normally, the LED will begin to blink
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