The first step is to install the u2if firmware onto the Raspberry Pi Pico. This is super easy:

  1. Download the latest release UF2 file from the repo: https://github.com/execuc/u2if/releases
  2. Put the Pico in bootloader mode by holding the BOOTSEL button while plugging in the board.
  3. Drag the downloaded UF2 file to the RPI-RP2 folder.
  4. DONE!

The board will reset after the copy is complete. Note that no folders will show up. So it may seem like nothing happened.

No folders will show up after reset - this is normal.

Now the Pico will show up as two devices - a USB HID (Human Interface Device) and a USB CDC (Communication Device Class). The former provides a generic interface for sending 64 byte "reports" back and forth. The later is essentially a serial interface, aka "com port". How these show up on your PC will depend on OS.

linux dmesg

On linux, the dmesg output will look something like this when connecting the Pico:

[Mon Apr 26 13:07:36 2021] usb 2-1.5: new full-speed USB device number 12 using ehci-pci
[Mon Apr 26 13:07:36 2021] usb 2-1.5: New USB device found, idVendor=cafe, idProduct=4005, bcdDevice= 1.00
[Mon Apr 26 13:07:36 2021] usb 2-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[Mon Apr 26 13:07:36 2021] usb 2-1.5: Product: U2IF
[Mon Apr 26 13:07:36 2021] usb 2-1.5: Manufacturer: Pico
[Mon Apr 26 13:07:36 2021] usb 2-1.5: SerialNumber: 0xE6604430433F5326
[Mon Apr 26 13:07:36 2021] cdc_acm 2-1.5:1.0: ttyACM0: USB ACM device
[Mon Apr 26 13:07:36 2021] hid-generic 0003:CAFE:4005.000C: hiddev1,hidraw7: USB HID v1.11 Device [Pico U2IF] on usb-0000:00:1d.0-1.5/input2

Windows Device Manager

On Windows, several new entries should show up in Device Manager:

This guide was first published on May 01, 2021. It was last updated on 2021-05-26 15:05:43 -0400.

This page (Setup for Pico) was last updated on Nov 28, 2021.

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