4. Installing Klipper on SKR3 EZ

Geschrieben von: David Husolo

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Moderate

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Einleitung

I wanted to try and keep everything as neat as possible while reusing as many of the original components as possible. I wanted the RPI to remain hidden. I came up with a design that uses the existing are the motherboard was installed in but also eliminates the tool drawer. Believe it or not this was a hard choice because as simple as the tool drawer was I really liked that they incorporated it.

I recommend you do not install the SKR3 EZ and RPI into the printer until the firmware flashing is complete.

Schritt 1

Download and extract the latest version of Mainsail from their Github
Open the Raspberry Pi Imager
Select Operating System > Use custom > Select the Mainsail OS you downloaded.
Select Storage > Select your SD/USB.
Bring up the Advanced Settings menu by pressing CTRL+SHIFT+X
Here you can setup your WiFi, locale, enable SSH and numerous other options.
Write > Yes to confirm
After imaging is complete the SD/USB is automatically ejected. Insert it into the RPI.

Schritt 2

Connect your Raspberry Pi to the SKR3 EZ by USB or UART cable. I used a UART cable so that is what I will be showing but I'll try to explain how to setup USB as well.
UART wiring
PA10 > GPIO15
PA9 > GPIO14
GND > GND
For USB ONLY connect a USB cable from the SKR3 EZ to the RPI and place a jumper on VUSB
Make sure the double throw switch is in the up position
Connect the RPI to it's 5v power supply and power it on. Do not power on the the 24v PSU

Schritt 3

Verify the RPI is connected to your network. Open command prompt and run
ping mainsailos.local
You should see it return successful pings
Open a web browser and go to
mainsail.local
On the machine tab you can see the IP address of your RPI next to "wlan0"
I use Remote Terminal, but using your favorite SSH client login to your RPI with the default credentials

Schritt 4

Set your locale
sudo raspi-config
Set your region preferences for L1-L4
Reboot your RPI when finished

Schritt 5

SSH back into your RPI and run
sudo apt-get update
sudo apt-get upgrade -y
Because I used a brand new image (released the day before) there was nothing to update. If yours installs updates make sure you restart the pi

Schritt 6

SSH into your pi and run
cd ~/klipper
make menuconfig
Set the following parameters
Enable extra low-level configuration options
Micro-controller Architecture (STMicroelectronics STM32) --->
Processor model (STM32H743) --->
Bootloader offset (128KiB bootloader (SKR SE BX v2.0)) --->

Schritt 7

Continued
Clock Reference (25 MHz crystal) --->
3 wire cable connected from TFT to RPI GPIO
Communication interface (USART1 (on PA10/PA9)) --->
USB Cable
Communication interface (USB (on PA11/PA12)) --->
Press ESC key
Y to save configuration

Schritt 8

Press and hold the BOOT and RESET buttons.
Release the RESET button first, than release BOOT. This will put the board in DFU mode.
Get the boards ID number by running
lsusb

Schritt 9

Compile the firmware by running
Make
The SKR3 doesn't have a bootloader so you cannot flash it from the RPI. You'll need to use the SD method.
Open WINSCP
Navigate to /klipper/out/
Copy klipper.bin to your PC and rename it to firmware.bin
Copy firmware.bin to a SD. I used a 128mb one I had laying around
Holding the RESET button on the SKR3 EZ, insert the SD card into the SKR3 EZ.

Schritt 10

Release the reset button and the firmware will update. When the status LED goes out the firmware update is complete.
Remove the SD card and press the RESET button.
FOR USB CONNECTED ONLY
You need to get the boards ID. Run
ls /dev/serial/by-id/
Reboot the RPI