Katapult Firmware

Notes

• Katapult is the BL firmware
• SHT36_V3 supports CAN and RS232
• Only CAN firmware is provided here, in 500K and 1M rates

Entering Flash Mode

Tip

The arrow points to the BOOT button

• Entering Flash Mode:
  • Completely power off the toolboard.
  • Press and hold the BOOT button (location shown below). At the same time, connect it to the computer via a Type-C data cable.
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Flashing Firmware

• Windows Flashing Tutorial
• Host Flashing Tutorial

• SHT36 V3 firmware download address
• You can obtain the firmware via the following link:

• FLY_SHT36V3_katapult_CAN_500K.uf2
• FLY_SHT36V3_katapult_CAN_1M.uf2

Windows 默认可能隐藏文件扩展名。下载后请确认文件扩展名未被修改，不要保存成 .txt 或其他扩展名。

• The firmware is located in

FLY-Firmware/ToolBoard/SHT36

1. Confirm that the tool board has entered UF2 flashing mode, and a removable disk named RPI-RP2 appears on your computer.

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2. Release the BOOT button or remove the BOOT jumper.

Windows File Extension Display

Windows may hide file extensions. Please check "File name extensions" in File Explorer and ensure you are using the .uf2 firmware; do not modify the firmware file extension.

3. Copy the .uf2 firmware to be flashed to the RPI-RP2 disk.

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4. After the firmware write is complete, the RPI-RP2 disk will automatically disappear, indicating that the UF2 firmware has been successfully flashed.

1. Compile the RP2040 flashing tool. You can skip this step if it has already been done.

cd ~/klipper/lib/rp2040_flash/
make

2. Confirm that the toolboard has entered UF2 flashing mode.

lsusb

If 2e8a:0003 appears in the output, it indicates that the device has entered RP2040 flashing mode. The device name displayed may vary across different systems, so the USB ID should be used as the reference.

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Device Not Detected

Do not proceed with flashing if 2e8a:0003 does not appear. Please disconnect the toolboard power and repeat the steps in the "Entering Flashing Mode" section on this page.

3. Pull or update the precompiled firmware repository.

• Linux
• FLYOS

First-time download:

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

Update the repository if it has already been downloaded:

git -C ~/FLY-Firmware pull --ff-only

First-time download:

git clone https://cnb.cool/3dmellow/FLY-Firmware.git /data/FLY-Firmware
ln -s /data/FLY-Firmware /root/FLY-Firmware

Update the repository if it has already been downloaded:

git -C /data/FLY-Firmware pull --ff-only

4. Flashing the Firmware

Tip

Only one of the firmware files needs to be flashed

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

sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY-Firmware/ToolBoard/SHT36/FLY_SHT36V3_katapult_CAN_500K.uf2

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

sudo ~/klipper/lib/rp2040_flash/rp2040_flash ~/FLY-Firmware/ToolBoard/SHT36/FLY_SHT36V3_katapult_CAN_1M.uf2

5. The following prompt indicates a successful flash

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Tip

After flashing, the mainboard must be completely powered off once.

Confirming Firmware Startup

• If the firmware starts normally, the LED will begin blinking

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