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tip
  • SB2040 comes pre-flashed with Katapult firmware for CAN connection at 1M rate.
  • SB2040 Katapult firmware for CAN connection is available in 500K and 1M rates; flash as needed.
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • SB2040 can connect to the host via CAN.
  • CAN connection requires an XT30(2+2)-F cable.
  • Below is the style of the XT30(2+2)-F data cable:
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Important Notes
  • Motherboard firmware flashing requires using Katapult to flash Klipper.
  • If the motherboard is confirmed to already have Katapult flashed, there is no need to perform the final Katapult firmware flashing step.

How to Determine Which Firmware You Need​

  • SB2040 can only connect to the host via CAN.
  • CAN Firmware Flashing
    • Advantage: If Katapult firmware is flashed, firmware can be updated without touching the motherboard, and it supports bus connection.
    • Disadvantage: May cause errors like homing timeout when used with KlipperScreen.
    • Note: If using CAN, ensure the host supports CAN and pair it with a UTOC or a motherboard flashed with bridge firmware.

Katapult Firmware Explanation​

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 flashing via methods like DFU, the firmware can be updated with a single command.
  • Advantages: Quickly double-click the reset button or power off twice in quick succession to enter Katapult firmware, at which point an LED on the motherboard will blink.
  • Katapult firmware can only be used to flash firmware and cannot connect to Klipper!!!
  • Katapult firmware supports three methods for connecting to the host computer, with each method's firmware being independent of the others:
    • CAN connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands, with strong anti-interference capability.
      • Disadvantages: Requires prior knowledge of the firmware's compiled baud rate.
    • RS232 connection
      • Advantages: After compiling the Klipper firmware, it can be updated using commands, with very strong anti-interference capability.
      • Disadvantages: Cannot update the firmware with a single command; requires manually entering Katapult firmware.
    • USB connection
      • Advantages: After compiling the Klipper firmware, it can be updated directly using commands.
      • Disadvantages: Long data cables are prone to interference, which may cause disconnections.
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