SKR mini E3 V2.0 Klipper Firmware

Required Items

  • Klipper must be installed onto the Raspberry Pi
  • At least one microSD card needs to be available depending on number of controllers.

Build Firmware Image

  • Login to the Raspberry Pi
  • Run the following:
sudo apt install make
cd ~/klipper
make menuconfig

In the menu structure there are a number of items to be selected.

  • Ensure that the micro-controller architecture is set to ‘STM32’
  • Ensure that the processor model is set to ‘STM32F103’
  • Ensure that the Bootloader offset is set to ‘28KiB’
  • Ensure that the Clock Reference is set to ‘8 Mhz’
  • Ensure that “Enable extra low-level configuration options” is selected.
  • Ensure that “Use USB for communication (instead of serial)” is selected.
  • Ensure that “GPIO pins to set at micro-controller startup” includes ‘!PA14’.

Klipper compilation config menu

Once the configuration is selected, select “Exit” and “Yes” if asked to save the configuration.

Run the following:

make clean

The make command, when completed, creates a firmware file klipper.bin which is stored in the folder /home/pi/klipper/out. This file need to be copied to the Mini E3 board. The easiest way to do this is to use a GUI like WinSCP on Windows or either Cyberduck or scp (from terminal) on Mac to copy the file to your computer.

Cyberduck software example

Load Firmware Image

Copy the klipper.bin to the desktop, then rename it to firmware.bin

Important: If the file is not renamed, the firmware will not be updated properly.

Ensure that the Mini E3 board is not powered, then remove the microSD card that is installed.

Connect the microSD card to the computer with the firmware.bin file. Open the microSD card in the file browser. There may be a file named ‘firmware.cur’; that file can be deleted or left alone. It does not matter because it will be overwritten later.

Copy the firmware.bin from the desktop onto the microSD card. If problems are encountered transferring the file(s) to the microSD card, reformat the microSD card with a FAT32 filesystem and try again.

Replace the microSD card into the Mini E3.

Turn on the power supply to power on the Mini E3 board. If named properly, the SKR will automatically update with the Klipper firmware.

Important: If the Mini E3 is not powered with 12-24V, Klipper will be unable to communicate with the TMC drivers via UART and the Mini E3 will automatically shut down.

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