SKR Pico 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

Connect the Pico and the Pi via USB
SSH into the Raspberry Pi using Putty or a similar tool
Run the following:

sudo apt install make
cd ~/klipper
make menuconfig

In the configurator, Enable extra low-level configuration options

Ensure that the micro-controller architecture is set to ‘Raspberry Pi RP2040’

Klipper compilation config menu

Once the configuration is selected, Pres Q to exit and “Yes” if asked to save the configuration.

Run the following:

make clean
make

The make command, when completed, creates a firmware file called klipper.uf2 and can be located in the directory ~/klipper/out. On the raspberry pi

Prepare SKR PICO for flashing

A couple steps need to be taken to setup the SKR Pico for flashing

Install the jumper for USB Power (this enables the Pico to be powered over USB and will be removed after flashing. Only use this if you don’t have it connected to 24v at the moment)
Install the jumper on the Boot pins

SKR Pico required pins for flashing mode

Now, you can flash the SKR Pico a couple different ways - via PC or the Raspberry pi. We will cover both methods in this guide

Flashing the image

PC Method

You can now copy the klipper.uf2 file to a directory that you can access via mainsail/fluid by running the following command

cp out/klipper.uf2 ~/printer_data/config/klipper.uf2

After running the above command, you should find the klipper.uf2 file in the config section of your UI (Mainsail/fluidd)

Mainsail klipper UF2 file

Right click and download this (klipper.uf2) file to your PC in order to flash the Skr Pico.

Next, you will connect the Skr Pico to your PC using the USB-C connector, then push the reset button on the Pico. It should show up just like a flash drive would on your computer.

Windows Explorer drive mounted

The last step is to copy the file you saved above (klipper.uf2) onto the Skr Pico just like you would with any file on a flash drive. As soon as you copy the file over the SKR pico will reboot automatically and it will be flashed with Klipper.

Now, unplug the Pico from the PC, remove the jumpers, plug it into your Raspberry Pi, push the reset button, and check if it’s been flashed properly by running the following command:

ls /dev/serial/by-id

Serial ID

If it has been flashed properly the result should be similar to the one in the img above.

NOTE: your USB-ID will be different, but it should start with usb-Klipper-rp2040

Raspberry Pi method

With the Pico plugged into the Pi via USB-C and the boot jumper installed, press the reset button.

Next we need to mount the SKR Pico to the Raspi to copy the file (klipper.uf2) over

Run the following commands:

sudo mount /dev/sda1 /mnt
sudo cp out/klipper.uf2 /mnt
sudo umount /mnt

Next remove the jumpers that were installed earlier and reset the SKR Pico

Run this command to receive the USB-ID for the SKR Pico

ls /dev/serial/by-id

If it has been flashed properly the result should be similar to the one in the img below.