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.

tip

• SHT36 LIS3DH supports CAN
• Only CAN firmware at 500K and 1M rates is provided here

Enter Boot Mode

tip

The circled part is the BOOT button

• With the motherboard completely powered off, short-circuit the BOOT button and then connect one end of the data cable with data transmission to the motherboard and the other end to your device
• Then remove the short circuit from the BOOT
  

Flash Firmware

Windows flashing tutorial

• Katapult firmware for SHT36_LIS3DH Click to download firmware automatically

• Prepare a data cable with data transfer capabilities.
• Download the firmware to the computer.
• Connect the BOOT jumper or hold it and connect it to the computer, at this point the RPI-RP2 disk will appear.
• Remove the BOOT jumper or release the button!!!
• Copy the firmware that needs to be burned into it, please note that only UF2 suffix firmware can be used!!! (Do not modify the suffix name, it is useless.)
• Refer to
• After copying the firmware into the RPI-RP2 disk, it will automatically disappear, indicating that the firmware burning is complete!

Host computer flashing tutorial

1. Install the burning tool

   • Enter the following command in SSH
   • Only execute this the first time you burn, no need to execute it afterwards

   cd ~/klipper/lib/rp2040_flash/ && make
   

2. Execute the following command to check if the connection is successful.

   • Enter lsusb

   • If there is no 2e8a:0003 device, please try to re-enter burning mode

   • Due to system version issues, it may show other names. If there is 2e8a:0003, it indicates that the burning mode has been entered.

     
   Notice

   Proceed to the next step only if there is a 2e8a:0003

3. Pull the pre-compiled firmware

   • These are all pre-compiled firmwares
   • Please note that the host machine needs to be able to access the internet to install
   • The host machine needs to execute the following command to download the firmware package

   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

4. Flash Firmware

tip

Only one of the firmwares needs to be flashed

• Below is the firmware flashing command for 500K CAN rate

  sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY_Katapult/BL/SHT36/FLY_SHT36LIS3DH_CANBOOT_CAN_500K.uf2
  • Below is the firmware flashing command for 1M CAN rate

  sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY_Katapult/BL/SHT36/FLY_SHT36LIS3DH_CANBOOT_CAN_1M.uf2

5. If the following prompt appears, the flashing is successful

   

tip

After flashing, the motherboard needs to be completely powered off once.

Confirm if the Firmware Starts

• If the firmware starts normally, the LED will start flashing