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tip
  • MMU provides Katapult firmware with USB and CAN connections, which can be flashed as needed.
  • MMU comes with pre-flashed Katapult firmware for CAN connection at a rate of 1M.
  • Katapult Firmware Burn

Firmware Burn Instructions

  • MMU can connect to the host machine via RS232, CAN, or USB.
  • RS232 and CAN require the use of XT30(2+2)-F for connection, while USB requires a data-enabled TYPE-C cable for connection.
  • Below is the style of the XT30(2+2)-F data cable.
Note
  • Motherboard firmware burning needs to be done through Katapult to burn Klipper.
  • If you are sure that the motherboard has already been burned with Katapult, there is no need to perform the final Katapult firmware burn, as this is only a precaution in case the Katapult firmware was not burned successfully.
  • You can quickly press the reset button twice to see if an LED on the motherboard is blinking. If it is, it indicates that the motherboard has entered Katapult firmware.

How to Determine Which Firmware You Need​

  • MMU can connect to the host machine using the following methods.
  • CAN Firmware Burn
    • Advantage: If you flash the Katapult firmware, you can update the firmware without touching the motherboard and it supports bus connections.
    • Disadvantage: It may cause errors such as timeout when using KlipperScreen together.
    • Tip: If you need to use CAN, confirm whether the host machine supports CAN and pair it with UTOC or a motherboard with bridge firmware.
  • RS232 Firmware Burn
    • Advantage: No special software is required to use it, communication is reliable and stable.
    • Disadvantage: To reflash the firmware, you need to enter manual DFU mode or double-click RST to enter Katapult to update the firmware.
    • Tip: It requires G2T or UTOR to use.
  • USB Firmware Burn
    • Advantage: If you flash the Katapult firmware, you can update the firmware without touching the motherboard. If you use memory cards or DFU flashing, you still need to update the firmware as usual, communication is reliable and stable.
    • Disadvantage: Multiple USB devices may affect data transmission.

Katapult Firmware Instructions​

tip

Katapult was originally named CanBoot and was later renamed.

  • Katapult firmware is a type of bootloader that can be used in conjunction with Klipper. After being flashed using methods like DFU, you can use commands to update the firmware in one click.
  • Advantages: Double resetting or quickly cutting power twice will enter the Katapult firmware, and the pre-configured LED will flash; if not configured, it won't flash.
  • The Katapult firmware can only be used for flashing firmware and cannot connect to Klipper!!!
  • There are three ways to connect the Katapult firmware to the host machine:
    • CAN connection
      • Advantages: After compiling the KLIPPER firmware, you can directly update the firmware using commands.
      • Disadvantages: You need to know the firmware compilation rate in advance.
    • RS232 connection
      • Advantages: After compiling the KLIPPER firmware, you can update the firmware using commands.
      • Disadvantages: You cannot update the firmware in one click using commands; you need to manually enter the Katapult firmware.
    • USB connection
      • Advantages: After compiling the KLIPPER firmware, you can directly update the firmware using commands.