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 flashing via DFU or similar methods, one-click firmware updates can be performed using commands.
• Advantages: Quickly double-press the reset button or power cycle twice to enter Katapult firmware, during which the 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 machine, 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; strong anti-interference capability.
    • Disadvantages: The firmware compilation speed must be known in advance.
  • RS232 connection
    • Advantages: After compiling the Klipper firmware, it can be updated using commands; very strong anti-interference capability.
    • Disadvantages: One-click firmware updates via commands are not possible; manual entry into Katapult firmware is required.
  • USB connection
    • Advantages: After compiling the Klipper firmware, it can be updated directly using commands.
    • Disadvantages: Long data cables are prone to interference, potentially causing disconnection.

Tip

• SHT36 PRO supports CAN
• Only CAN firmware is provided here, with rates of 500K and 1M

Entering Flash Mode

Tip

The circled area is BOOT

• With the motherboard completely powered off, short-circuit BOOT, then connect one end of a TYPE-C cable with data transfer capability to the motherboard and the other end to your device
• Then remove the short-circuit on BOOT
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Flashing the Firmware

• Windows Flash Tutorial
• Host Machine Flash Tutorial

• SHT36_PRO Katapult firmware
• You can obtain the firmware via the following link:

• Download Firmware Package - Directly download the latest firmware archive
• Repository Address - Visit the firmware repository

• The firmware is located at

FLY-Firmware/ToolBoard/SHT36

• Prepare a data cable with data transfer functionality
• Download the firmware to the computer
• Connect the BOOT jumper, or press and hold the BOOT button before connecting to the computer. The RPI-RP2 disk will then appear
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• Remove the BOOT jumper or release the button!!!
• Copy the firmware to be flashed into it. Please note that only firmware with the UF2 extension can be used!!! (Do not modify the file extension, as this is ineffective)
• Reference
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• After the firmware is copied in, the RPI-RP2 disk will automatically disappear, indicating the firmware flashing is complete!

1. Install the flashing tool

   • Enter the following command in SSH
   • This only needs to be executed for the first flashing; no need to run it again 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, try re-entering flashing mode

   • Due to system version issues, it may display a different name. If 2e8a:0003 appears, it means flashing mode has been entered

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   Notes

   Proceed to the next step only when 2e8a:0003 is present

3. Pull the precompiled firmware

   • These are all precompiled firmware files
   • Please note that the host machine needs internet access to install
   • The host machine needs to execute the following command to download the firmware package

   cd && git clone https://cnb.cool/3dmellow/FLY-Firmware.git

   • If the firmware package has already been downloaded, it is recommended to update it before proceeding with the remaining operations

   cd ~/FLY-Firmware && git pull

4. Flash the firmware

Tip

Only flash one of the firmware files

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

sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY-Firmware/ToolBoard/SHT36/FLY_SHT36PRO_CANBOOT_500K.uf2

• Below is the flash command for 1M CAN rate firmware

sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY-Firmware/ToolBoard/SHT36/FLY_SHT36PRO_CANBOOT_1M.uf2

5. The following prompt indicates successful flashing

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Tip

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

Confirm Firmware Startup

• If the firmware starts successfully, the LED will blink
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