Raw HID keyboard forwarder to turn the Pi 400 into a USB keyboard

Overview

Raspberry Pi 400 as a USB HID Keyboard

Hook your Pi 400 up to your PC somehow, using a USB Type-C cable into the power port. Anker make good ones- I used a 3m white one for my tests.

Our USB-C to USB-A is great if you're using a USB-A port (but make sure it's a high power one): https://shop.pimoroni.com/products/usb-c-to-usb-a-cable-1m-black

This project started out life as a gist - https://gist.github.com/Gadgetoid/5a8ceb714de8e630059d30612503653f

Thank you to all the people who dropped by with kind words, suggestions and improvements.

Quickstart (Ish)

Add dtoverlay=dwc2 to /boot/config.txt

Reboot!

sudo modprobe libcomposite

wget https://github.com/Gadgetoid/pi400kb/blob/main/pi400kb?raw=true

chmod +x pi400kb

sudo ./pi400kb

YOUR PI 400 IS NOW A FREAKING KEYBOARD FOR YOUR PC WHAAAAT!?

Your keyboard input will be detached from your Pi while it's forwarded to your host computer.

Press Ctrl + Raspberry to exit and restore your keyboard on the Pi.

Building & Contributing

Building

sudo apt install libconfig-dev
git clone https://github.com/Gadgetoid/pi400kb
cd pi400kb
git submodule update --init
mkdir build
cd build
cmake ..
make
Comments
  • Error on run: usbg_init() no such file or directory.

    Error on run: usbg_init() no such file or directory.

    Happens on both mouse connected and disconnected.

    The full message I got:

    Found keyboard at: /dev/hidraw0
    Failed to open mouse device
    usbg_init()  No such file or directory: couldn't init gadget state
     
    Error on usbg init
    Error: USBG_ERROR_NOT_FOUND : Not found (file or directory removed)
    
    opened by ArsenicBismuth 2
  • fix compile warning

    fix compile warning

    This fixes the following compile warning:

    pi400kb/pi400.c: In function ‘modprobe_libcomposite’:                                                                                                                                         
    pi400kb/pi400.c:82:37: warning: passing argument 2 of ‘execv’ from incompatible pointer type [-Wincompatible-pointer-types]                                                                   
       82 |         execv("/usr/sbin/modprobe", argv);                                                                                                                                            
          |                                     ^~~~                                                                                                                                              
          |                                     |                                                                                                                                                 
          |                                     const char **                                                                                                                                     
    In file included from pi400kb/pi400.c:14:                                                                                                                                                     
    /usr/include/unistd.h:563:51: note: expected ‘char * const*’ but argument is of type ‘const char **’                                                                                          
      563 | extern int execv (const char *__path, char *const __argv[])                                                                                                                           
          |                                       ~~~~~~~~~~~~^~~~~~~~                                                                                                                            
    
    opened by DeeNewcum 1
  • Thanks, I can now type with pi 400 on my Ipad while ssh/vnc-ing to it

    Thanks, I can now type with pi 400 on my Ipad while ssh/vnc-ing to it

    Hi @Gadgetoid, really appreciate you made this, you pointed me to learning about libusbgx. I added ECM so that i could ssh/vnc to the PI 400 so that it's not just a "dumb" keyboard while not relying on known WIFI either. With ipad pro it's wickedly nifty and geeky ;)

    Having portable access to full linux and arm with GPIO while also act as portable keyboard for Ipad.....priceless

    Cheers

    opened by ahasani 1
  • Need to automatically run modprobe on boot

    Need to automatically run modprobe on boot

    The keyboard will not work correctly unless there is an autostart service for modprobe libcomposite on boot. If the modprobe isn't running, the main pi400kb executable will not run.

    opened by tigertank591 0
  • Toggle hook

    Toggle hook

    Use -DHOOK_PATH with cmake to define a path to a .sh script (or binary) to run on grab/ungrab.

    See hook.sh for details. "Grab" calls the script with a 1, "Ungrab" calls it with a 0.

    opened by Gadgetoid 0
  • Typo in pi400kb.service

    Typo in pi400kb.service

    Hey, this is a minor issue and would've been solved way easier and not even raised as an issue but a smarter brain than mine. However when copying and pasting and getting incredibly frustrated that I was constantly getting pi400kb.service fail no matter what I was doing I finally noticed that the script "ExecStart=/usr/sbin/pi400kb" was supposed to be "ExecStart=/usr/bin/pi400kb" which was causing the service to always fail because there is no path /usr/sbin/...

    Hopefully in the meantime this is useful to others (all 12 of us) to edit the pi400kb.service before saving until this is sorted.

    opened by Setayo 0
  • Question about why you need the vendor and the id of the keyboard.

    Question about why you need the vendor and the id of the keyboard.

    Hi, I've done this kind of thing, years ago on PDP-11s. I don't see you even passing the vendor and product id to the OTG side. I thought I was clever, back then, when I set the output port's control block for features and status to be the same as the controlling input side. Then, my friend Jeff showed me his version where he got the address of the interrupt service routine for input and did something that delivered the character to the output.

    Anyway, I'm trying to make arbitrary keyboards work for a reason. It turns out that my fancy mechanical keyboards are mostly gaming keyboards because thats the only way to get data-processing level switches and keycaps. I need to use a KVM. KVMs really don't like gaming keyboards. Hence, put a Pi in the middle,

    Is the output side getting this information in a side effect that I can't find in the code?

    I would prefer to do your "suitable device" check against the protocol field, which is 1 for keyboards. I'm going to do some experimental programming and debugging.

    My plan: if the device is a keyboard, just forward it. That's because it isn't going to do anything crazy--after all, the user has this keyboard and could plug it directly into the machine being controlled.

    I can see so many applications for pi400kb. I would always want a Pi in between my keyboard and the host.

    My best to you,

    Eirikur

    opened by Eirikur 1
  • Adds the modprobe.service on startup

    Adds the modprobe.service on startup

    The actual pi400kb service will not work on start up due to the need for modprobe libconfig to be ran. This creates a service to run on startup which should fix this.

    opened by tigertank591 0
  • The raw file returns a 404 error

    The raw file returns a 404 error

    Hi there,

    When trying to install yesterday I got a 404 error at the wget point. With or without sudo before the command. Is the link offline? Is there another link?

    2022-02-16-153452_1360x768_scrot

    opened by arm-ARMY 3
Releases(v0.0.1)
  • v0.0.1(Feb 4, 2022)

    This is the very first release, in order to move the binary out of the repository and provide 32bit/64bit versions- in theory.

    64bit TBC!

    If you find this useful I'd appreciate a dollar or two - https://patreon.com/gadgetoid

    What's Changed

    • Add basic build by @Gadgetoid in https://github.com/Gadgetoid/pi400kb/pull/3
    • Mouse support for #1 by @Gadgetoid in https://github.com/Gadgetoid/pi400kb/pull/2
    • use poll() to avoid 100% CPU load by @normen in https://github.com/Gadgetoid/pi400kb/pull/14
    • Toggle hook by @Gadgetoid in https://github.com/Gadgetoid/pi400kb/pull/9
    • fix compile warning by @DeeNewcum in https://github.com/Gadgetoid/pi400kb/pull/22
    • Prep for attached release files by @Gadgetoid in https://github.com/Gadgetoid/pi400kb/pull/23

    New Contributors

    • @Gadgetoid made their first contribution in https://github.com/Gadgetoid/pi400kb/pull/3
    • @normen made their first contribution in https://github.com/Gadgetoid/pi400kb/pull/14
    • @DeeNewcum made their first contribution in https://github.com/Gadgetoid/pi400kb/pull/22

    Full Changelog: https://github.com/Gadgetoid/pi400kb/commits/v0.0.1

    Source code(tar.gz)
    Source code(zip)
    pi400kb-v0.0.1-32bit-armv7l.zip(35.18 KB)
Owner
Philip Howard
Philip Howard
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