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Katapult Firmware

Katapult Firmware Description

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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
  • The Katapult firmware for D7 uses the third connection method: USB connection
  • D7 units manufactured after September 1, 2024 come pre-flashed with Katapult firmware

Entering DFU Flash Mode

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The left button is the BOOT button, and the right button is the RESET button.

  • There are two ways to enter flash mode
  • First method: With the tool board completely powered off, press and hold the BOOT button, then connect one end of a data-transfer-capable Type-C cable to the mainboard and the other end to your device
  • Second method: After connecting one end of a data-transfer-capable Type-C cable to the mainboard and the other end to your device, press and hold the BOOT button, then press the RST button, release the RST button first, and finally release the BOOT button

Flashing Firmware

  • Katapult firmware for D7
    • Click the download link below
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Notice
  • USB3.0 may fail to flash, please try to use the computer's USB2.0 for flashing
  • If flashing still fails, please try using a host computer for flashing
  • If the error below occurs, please use a USB hub
  1. Flashing tool Download link
  2. Please download SetupSTM32CubeProgrammer and STM32 DFU driver
  3. Copy the previously compiled firmware klipper.bin, Katapult, or Marlin to any directory on your computer
  4. Connect the motherboard to the computer using a Type-C cable, ensuring it has entered dfu flashing mode
  5. In STM32CubeProgrammer, select USB mode, then refresh and connect
  6. If no error pop-up appears, the connection is successful.
    Warning

    If the content shown in the figure below appears, it indicates a computer or software issue. Please use a host computer for flashing: Host Computer Flashing Tutorial

  7. Click the download icon on the left and check the options below
  8. Click the Browse button as indicated by the arrow, then select the firmware you need to flash
  9. Enter 0x08000000 in the Start address field
    • Please note that if the firmware is in HEX format, skip this step!!
  10. Click Start automatic mode below to begin flashing the firmware
  11. If the prompt shown below appears, the firmware flashing is complete
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