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 burning the firmware using methods like DFU, you can use commands to update the firmware with one click.
- Advantage: Quickly double-clicking the reset button or quickly cutting power twice will enter the Katapult firmware, at which point there will be an LED flashing on the mainboard.
- Katapult firmware can only be used to burn firmware and cannot connect to Klipper!!!
- Katapult firmware supports three connection methods for connecting to the host computer, and the firmwares for these three methods are independent of each other.
- CAN connection
- Advantage: After compiling the KLIPPER firmware, you can directly update the firmware using a command, and it has strong interference resistance.
- Disadvantage: You need to know the firmware compilation rate in advance.
- RS232 connection
- Advantage: After compiling the KLIPPER firmware, you can update the firmware using a command, and it has very strong interference resistance.
- Disadvantage: You cannot use a command to update the firmware with one click; you need to manually enter the Katapult firmware.
- USB connection
- Advantage: After compiling the KLIPPER firmware, you can directly update the firmware using a command.
- Disadvantage: A long data cable is prone to interference, which may lead to disconnection.
- CAN connection
tip
- SHT36/42 supports CAN
- Only CAN firmware with 500K and 1M rate is provided here
Enter flashing mode
tip
The circled one is the BOOT button
- With the mainboard completely powered off, short-circuit the BOOT button and connect one end of a data transmission cable to the mainboard and the other end to your device
Flashing firmware
- STM32F072 Windows flashing tutorial
- STM32F072 Host computer flashing tutorial
- Katapult firmware for SHT36
- Click the download link below
-
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Notes
- USB3.0 may not be able to burn, please try to use the
USB2.0
of the computer for burning - If there is no USB2.0 interface, please use an extension dock
- If it still cannot be burned, please use the host software for burning
- Burning tool Download address
- Need to download
SetupSTM32CubeProgrammer
andSTM32 DFU driver
- Copy the compiled firmware (klipper.bin) or the pre-compiled
Katapult firmware
to any directory on the computer - Use a Type-C data cable to connect the mainboard to the computer, and make sure it has entered the
dfu
burning mode - In STM32CubeProgrammer, select USB mode, refresh, and connect
- If no error pop-up appears, the connection is successful.
Warning
If the content shown in the figure below appears, it is a computer or software problem. Please use the host software for burning:Host software burning tutorial
- Click the left download icon and select the ones below
- Click the
Browse
indicated by the arrow, then select the firmware you want to burn - Select
Start address
and input0x08000000
- Click
Start automatic mode
at the bottom to start burning the firmware - If the following prompt appears, it means the firmware has been burned successfully
- Install the burning tool
- No need to install the burning tool for the FLY upper computer
- If you need to install, please note: The upper computer needs to be connected to the internet to install normally
- If already installed, no need to install
sudo apt update
sudo apt install dfu-util -y
- Execute the following command to check if the connection is successful.
lsusb
- If there is no DFU device, please try to re-enter burning mode
- Due to system version issues, other names may be displayed. If
0483:df11
is shown, it indicates that the burning mode has been entered

- Pull the pre-compiled firmware
- These are all pre-compiled firmwares
- Please note: The upper computer needs to be connected to the internet to install
- The upper computer needs to execute the command below to download the firmware package (if unable to get the file due to network issues on the upper computer, please contact the administrator in the after-sales group)
cd && git clone https://github.com/FengHua741/FLY_Katapult.git
- If the firmware package has already been downloaded, it is recommended to update the firmware package before proceeding with the remaining operations
cd ~/FLY_Katapult && git pull
- Flash firmware
tip
Only flash one of the firmwares
-
Below are the firmware flashing commands for 500K CAN speed
sudo dfu-util -a 0 -d 0483:df11 --dfuse-address 0x08000000 -D ~/FLY_Katapult/developer/SHT36/FLY_SHT36_072_500K.BIN
-
Below are the firmware flashing commands for 1M CAN speed
sudo dfu-util -a 0 -d 0483:df11 --dfuse-address 0x08000000 -D ~/FLY_Katapult/developer/SHT36/FLY_SHT36_072_1M.BIN
-
If the content shown in the arrow in the following figure appears:
File downloaded successfully
, the flashing is successful
tip
After flashing is completed, the mainboard needs to be completely powered off once.
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