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tip
  • MMU provides USB and CAN connected Katapult firmware, which can be burned if needed.
  • MMU is factory pre-flashed with CAN connected Katapult firmware, with a rate of 1M.
  • Katapult Firmware Burning

Firmware Burning Instructions

  • MMU can be connected to the host computer using RS232, CAN, and USB three connection methods.
  • Among them, RS232 and CAN need to be connected using XT30(2+2)-F, and USB needs to be connected using a TYPE-C data cable with data transmission function.
  • Below is the XT30(2+2)-F data cable style.
Notice
  • Motherboard firmware burning needs to be done through Katapult burning Klipper.
  • If it is confirmed that the motherboard has been burned with Katapult, there is no need to burn the Katapult firmware at the end, which is just to prevent the motherboard's Katapult firmware from not being burned successfully.
  • You can quickly press the reset button twice to see if there is an LED flashing on the motherboard. If so, it means that the motherboard has entered the Katapult firmware.

How to Determine Which Firmware You Need​

  • MMU can be connected to the host computer in the following ways.
  • CAN Firmware Burning
    • Advantage: If the Katapult firmware is burned, the firmware can be updated without touching the motherboard, and bus connection is supported.
    • Disadvantage: Using KlipperScreen together may cause positioning timeout and other errors.
    • Tip: If you need to use CAN, please make sure the host computer supports CAN and needs to be used together with UTOC or a motherboard burned with bridge firmware.
  • RS232 Firmware Burning
    • Advantage: No special software is required to use, communication is reliable and stable.
    • Disadvantage: Reburning the firmware requires entering manual DFU to update the firmware or double-clicking RST to enter Katapult to update the firmware.
    • Tip: It needs to be used together with G2T or UTOR.
  • USB Firmware Burning
    • Advantage: If the Katapult firmware is burned, the firmware can be updated without touching the motherboard. If a memory card or DFU burning is used, it still needs to be updated in the original way. Communication is reliable and stable.
    • Disadvantage: If there are multiple USB devices, it may affect data transmission.

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.