Katapult Firmware

Important Notes

• Katapult is the Bootloader (BL) firmware.
• SHT36_V3 supports both CAN and RS232.
• Only CAN firmware is provided here, with rates of 500K and 1M.

Entering Flash Mode

tip

The arrow points to the BOOT button.

• Enter Flash Mode:
  • Completely power off the tool board.
  • Press and hold the BOOT button (location shown below) while connecting it to your computer via a Type-C data cable.
  

Flashing the Firmware

Windows Flashing Tutorial

• SHT36 V3 Firmware Download Links
  • Click the download links below.
  • Loading...

• Prepare a data cable with data transfer capabilities.
• Download the firmware to the computer.
• Connect the BOOT jumper or hold it and connect it to the computer, at this point the RPI-RP2 disk will appear.
• Remove the BOOT jumper or release the button!!!
• Copy the firmware that needs to be burned into it, please note that only UF2 suffix firmware can be used!!! (Do not modify the suffix name, it is useless.)
• Refer to
• After copying the firmware into the RPI-RP2 disk, it will automatically disappear, indicating that the firmware burning is complete!

Host Flashing Tutorial

1. Install the flashing tool

   • Enter the following command in SSH
   • Only need to execute it for the first flash, no need to execute again later

   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 flash mode

   • Due to system version issues, it may display other names. If 2e8a:0003 is present, it means the flash mode has been entered

     
   Notes

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

3. Pull the pre-compiled firmware

   • All are pre-compiled firmware here
   • Please note that the host computer needs to be online to install
   • The host computer needs to execute the following command to download the firmware package

   cd && git clone https://github.com/FengHua741/FLY_Katapult.git

   • It is recommended to update the firmware package if you have already downloaded it before proceeding with the remaining operations

   cd ~/FLY_Katapult && git pull

4. Flash the Firmware

tip

You only need to flash one of the firmware files.

• Command to flash the 500K CAN rate firmware:

sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY_Katapult/BL/SHT36/FLY_SHT36V3_katapult_CAN_500K.uf2

• Command to flash the 1M CAN rate firmware:

sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY_Katapult/BL/SHT36/FLY_SHT36V3_katapult_CAN_1M.uf2

5. If the following prompt appears, the flashing was successful.

tip

After flashing is complete, you need to completely power cycle the board once.

Verifying Firmware Startup

• If the firmware starts normally, the LED will begin to blink.