Katapult Firmware

Katapult Firmware Description

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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.

tip

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

Entering Programming Mode

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The circled part is the BOOT button

• With the motherboard completely powered off, short the BOOT button and connect one end of the data cable to the motherboard and the other end to your device.
• Then release the short on the BOOT button
  

Flashing Firmware

Windows Flashing Guide

• SHT36_PRO's Katapult firmware Click to automatically download the firmware

• Prepare a data cable with data transmission capability
• Download the firmware to your computer
• Connect the BOOT jumper or hold it down after connecting to the computer, at this point the RPI-RP2 disk will appear
  
• Remove the BOOT jumper or release the button!!!
• Copy the firmware you need to burn into the disk, please note that only UF2 suffix firmware can be used!!! (Do not modify the suffix name, it is useless)
• Reference
  
• After copying the firmware into the RPI-RP2 disk, it will automatically disappear, at this point the firmware burning is completed!

Host Computer Flashing Guide

1. Install the flashing tool

   • Enter the following command in SSH
   • Only execute this for the first flashing, no need to run it again after that

   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, please try to re-enter flashing mode

   • Due to system version issues, it may display other names. If there is a 2e8a:0003, it indicates that the flashing mode has been entered.

     
   Note

   Only proceed if there is a 2e8a:0003.

3. Pull the pre-compiled firmware

   • These are all pre-compiled firmwares
   • Please note that the host machine needs to be able to access the internet to install
   • The host machine needs to execute the following command to download the firmware package

   cd && git clone https://github.com/FengHua741/FLY_Katapult.git
   • If you have already downloaded the firmware package, it is recommended to update the firmware package before proceeding with the remaining steps

   cd ~/FLY_Katapult && git pull

4. Flashing Firmware

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Only one firmware needs to be flashed.

• Below is the command to flash the 500K CAN speed firmware

sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY_Katapult/BL/SHT36/FLY_SHT36PRO_CANBOOT_500K.uf2

• Below is the command to flash the 1M CAN speed firmware

sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY_Katapult/BL/SHT36/FLY_SHT36PRO_CANBOOT_1M.uf2

5. If the flashing is successful, you will see the following prompt

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

Confirming Firmware Boot

• If the firmware starts up normally, the LED will blink.