tip

ERCF comes pre-flashed with the Katapult firmware for CAN connection, at a rate of 1M
The Katapult firmware for ERCF CAN connection has rates of 500K and 1M, you can flash it yourself if needed
Katapult Firmware Flashing

Firmware Flashing Instructions

Notes

Mainboard firmware flashing needs to be done through Katapult to flash Klipper
If you are sure that the mainboard has already been flashed with Katapult, there is no need to flash the Katapult firmware at the end

How to determine which firmware you need

ERCF can connect to the host computer in the following ways
CAN Firmware Flashing
- Benefits: If you have flashed the Katapult firmware, you can update the firmware without touching the mainboard, and it supports bus connection
- Disadvantages: It may cause errors such as homing timeout when used together with KlipperScreen.
- Note: If you need to use CAN, make sure the host computer supports CAN, and you need to pair it with UTOC or a mainboard with a bridging firmware
USB Firmware Flashing
- Benefits: If you have flashed the Katapult firmware, you can update the firmware without touching the mainboard. If you are using an SD card or DFU flashing, you still need to update the firmware in the original way, communication is reliable and stable
- Disadvantages: If there are multiple USB devices, it may affect data transmission

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 burning the firmware using methods like DFU, you can use commands to update the firmware with one click.
Advantage: Quickly double-clicking the reset button or quickly cutting power twice will enter the Katapult firmware, at which point there will be an LED flashing on the mainboard.
Katapult firmware can only be used to burn firmware and cannot connect to Klipper!!!
Katapult firmware supports three connection methods for connecting to the host computer, and the firmwares for these three methods are independent of each other.
- CAN connection
  - Advantage: After compiling the KLIPPER firmware, you can directly update the firmware using a command, and it has strong interference resistance.
  - Disadvantage: You need to know the firmware compilation rate in advance.
- RS232 connection
  - Advantage: After compiling the KLIPPER firmware, you can update the firmware using a command, and it has very strong interference resistance.
  - Disadvantage: You cannot use a command to update the firmware with one click; you need to manually enter the Katapult firmware.
- USB connection
  - Advantage: After compiling the KLIPPER firmware, you can directly update the firmware using a command.
  - Disadvantage: A long data cable is prone to interference, which may lead to disconnection.