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How to use Klipper on SKR Pico V1.0

Pinout

Raspberry pi pinout

SKR Pico V1.0 pinout

Wiring diagram

Raspberry pi is powered by an external +5V adapter and communicates with SKR Pico V1.0 via USB

Raspberry pi is powered by the motherboard +5V and communicates with SKR Pico V1.0 via UART

Build Firmware Image

1. Precompiled firmware(The source code version used is Commits on Dec 13, 2021)

   • klipper-USB.uf2 Use USB to communicate with raspberry pi. Connect the type-A USB of raspberry pi with the type-C of motherboard directly to communicate normally.
   • klipper-UART0.uf2 Use UART0 to communicate with raspberry pi. Connect the UART-TX of raspberry pi with the UART-RX0 of motherboard and connect the UART-RX of raspberry pi with the UART-TX0 of motherboard directly to communicate normally.

2. Build your own firmware
   

   1. Refer to klipper's official installation to download klipper source code to raspberry pi

   2. Building the micro-controller with the configuration shown below.

      • [*] Enable extra low-level configuration options
      • Micro-controller Architecture = Raspberry Pi RP2040
      • IF USE USB
        • Communication interface = USB
      • ElSE IF USE UART0
        • Communication interface = Serial (on UART0 GPIO1/GPIO0)

      
      

   3. Once the configuration is selected, press q to exit, and "Yes" when asked to save the configuration.

   4. Run the command make

   5. The klipper.uf2 file will be generated in the folder home/pi/kliiper/out when the make command completed. And you can use the windows computer under the same LAN as raspberry pi to copy klipper.uf2 from raspberry pi to the computer with pscp command in the CMD terminal. such as pscp -C pi@192.168.0.101:/home/pi/klipper/out/klipper.uf2 c:\klipper.uf2(The terminal may prompt that The server's host key is not cached and ask Store key in cache?((y/n), Please type y to store. And then it will ask for a password, please type the default password raspberry for raspberry pi)

Firmware Installation

1. You can use the method in Build Firmware Image 2.5 or use a tool such as cyberduck or winscp to copy the klipper.uf2 file from your pi to your computer.

2. Insert a jumper on the Boot pins of the motherboard and click the Reset button to enter the burn mode (Note: If you want to use USB to power the motherboard, you need to insert a jumper on USB Power. When there is 12V / 24V power supply, it is best to remove the jumper)
   

3. Connect USB-C to computer, then you will see a USB flash drive named RPI-PR2, copy klipper-USB.uf2, klipper-UART0.uf2 provided by us or klipper.uf2 compiled by yourself to the USB flash drive, the motherboard will automatically reboot and update the firmware, the computer will re-identify this USB flash drive means the firmware update is complete, unplug the boot jumper and click the Reset button to enter normal working mode
   

4. you can confirm that the flash was successful, by running ls /dev/serial/by-id. if the flash was successful, this should now show a klipper device, similar to:

   

   (note: this test is not appicable if the firmware was compiled for UART, rather than USB)

Configure the printer parameters

Basic configuration

1. Refer to klipper's official installation to Configuring OctoPrint to use Klipper
2. Refer to klipper's official installation to Configuring Klipper. And use the configuration file SKR Pico klipper.cfg as the underlying printer.cfg, which includes all the correct pinout for SKR Pico V1.0
3. Refer to klipper's official Config_Reference to configure the features you want.
4. If you use USB to communicate with raspberry pi, run the ls /dev/serial/by-id/* command in raspberry pi to get the correct ID number of the motherboard, and set the correct ID number in printer.cfg. And wiring reference here

   [mcu]
   serial: /dev/serial/by-id/usb-Klipper_rp2040_E66094A027831922-if00
   

5. If you use UART0 to communicate with raspberry pi, you need to modify the following files by inserting the SD card into the computer or by SSH command. And wiring reference here
   • Remove console=serial0,115200 in /boot/cmdline.txt
   • Add dtoverlay=pi3-miniuart-bt at the end of file /boot/config.txt
   • Modify the configuration of [mcu] in printer.cfg to serial: /dev/ttyAMA0 and enable restart_method: command by SSH

     [mcu]
     serial: /dev/ttyAMA0
     restart_method: command