Introduction
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.
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Download and extract the latest version of Mainsail from their Github
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Open the Raspberry Pi Imager
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Select Operating System > Use custom > Select the Mainsail OS you downloaded.
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Select Storage > Select your SD/USB.
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Bring up the Advanced Settings menu by pressing CTRL+SHIFT+X
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Here you can setup your WiFi, locale, enable SSH and numerous other options.
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Write > Yes to confirm
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After imaging is complete the SD/USB is automatically ejected. Insert it into the RPI.
Ask FixBot
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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.
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UART wiring
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PA10 > GPIO15
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PA9 > GPIO14
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GND > GND
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For USB ONLY connect a USB cable from the SKR3 EZ to the RPI and place a jumper on VUSB
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Make sure the double throw switch is in the up position
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Connect the RPI to it's 5v power supply and power it on. Do not power on the the 24v PSU
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Verify the RPI is connected to your network. Open command prompt and run
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ping mainsailos.local
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You should see it return successful pings
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Open a web browser and go to
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mainsail.local
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On the machine tab you can see the IP address of your RPI next to "wlan0"
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I use Remote Terminal, but using your favorite SSH client login to your RPI with the default credentials
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Set your locale
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sudo raspi-config
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Set your region preferences for L1-L4
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Reboot your RPI when finished
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SSH back into your RPI and run
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sudo apt-get update
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sudo apt-get upgrade -y
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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
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SSH into your pi and run
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cd ~/klipper
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make menuconfig
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Set the following parameters
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Enable extra low-level configuration options
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Micro-controller Architecture (STMicroelectronics STM32) --->
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Processor model (STM32H743) --->
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Bootloader offset (128KiB bootloader (SKR SE BX v2.0)) --->
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Continued
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Clock Reference (25 MHz crystal) --->
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3 wire cable connected from TFT to RPI GPIO
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Communication interface (USART1 (on PA10/PA9)) --->
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USB Cable
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Communication interface (USB (on PA11/PA12)) --->
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Press ESC key
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Y to save configuration
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Press and hold the BOOT and RESET buttons.
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Release the RESET button first, than release BOOT. This will put the board in DFU mode.
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Get the boards ID number by running
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lsusb
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Compile the firmware by running
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Make
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The SKR3 doesn't have a bootloader so you cannot flash it from the RPI. You'll need to use the SD method.
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Open WINSCP
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Navigate to /klipper/out/
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Copy klipper.bin to your PC and rename it to firmware.bin
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Copy firmware.bin to a SD. Make sure the SD card is formatted to FAT32.
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Holding the RESET button on the SKR3 EZ, insert the SD card into the SKR3 EZ.
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Release the reset button and the firmware will update. When the status LED goes out the firmware update is complete.
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Remove the SD card and press the RESET button.
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FOR USB CONNECTED ONLY
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You need to get the boards ID. Run
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ls /dev/serial/by-id/
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Reboot the RPI
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Power on the RPI and SSH into it.
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Run
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cd ~/klipper
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sudo cp "./scripts/klipper-mcu-start.sh" /etc/init.d/klipper_mcu
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sudo update-rc.d klipper_mcu defaults
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sudo service klipper stop
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make clean
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make
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Continued
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make menuconfig
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Micro-Controller Architecture > Linux Process. Press esc than Y
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make flash
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sudo service klipper start
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Verify klipper_host_mcu is in the tmp directory with ls /tmp/*
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Add the pi to the TTY group
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sudo usermod -a -G tty pi
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Cancel: I did not complete this guide.
5 other people completed this guide.
6 Guide Comments
is it different for a btt pi4b with cb1 emmc 32g
Thank you. I have it running with a BTT Pi (power 24V) and using USB with the SKE3 EZ.
Step 8 (Get the boards ID number by running) is only needed as check if things work.
/dev/serial was not created due to a faulty Debian script but can be solved by updating and upgrading "sudo apt -y update && sudo apt -y upgrade".
