Multibow

Find it on GitHub: thediveo/multibow.

Multibow adds ease-of use support for multiple layouts to Pimoroni Keybow macro keyboards. Simply switch between the installed layouts by pressing a special key combination (defaults to press-hold key #11, then tap key #5). And you can even control the key LEDs brightness (press-hold key #11, then tap key #8 to change brightness).

"Keybows" are solderless DIY 4x3 mechanical USB keyboards, powered by a Raspberry Pi. And yes, these days even keyboards now run Linux and script interpreters...

And yes, this is probably a New Year's project slightly gone overboard ... what sane reason is there to end up with a Lua-scripted multi-layout keyboard "operating" system and a bunch of automated unit test cases?

Installation

1. Download the Pibow firmware and copy all files inside its sdcard/ subdirectory onto an empty, FAT32 formatted microSD card. Copy only the files inside sdcard/, but do not place them into a sdcard directory on your microSD card.

2. Download all files from the sdcard/ subdirectory of this repository and then copy them onto the microSD card. This will overwrite but one file key.lua, all other files are new.

Multiple Keyboard Layouts

To enable one or more multibow keyboard layouts, edit sdcard/keys.lua accordingly in order to "require" them. The default configuration looks as follows:

require "layouts/shift" -- for cycling between layouts.
require "layouts/vsc-golang" -- debugging Go programs in VisualStudio Code.
require "layouts/kdenlive" -- editing video using Kdenlive.
require "layouts/empty" -- empty, do-nothing layout.

You can disable a specific keyboard layout by simply putting two dashes -- in front of the require "...", making it look like --require "...".

Layouts

The default setup activates the following macro keyboard layouts shown below.

You can switch (cycle) between them by pressing and holding key #11 (top-left key in landscape), then tapping key #5 (immediately right to #11), and finally releasing both keys.

Debug Go in VisualStudio Code

Debug Go programs and packages in VisualStudio Code with its Go extension.

┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐
┊ 11 ┊  ┊  8 ┊  ┊  5 ┊  ┊  2 ┊
└╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘

╔════╗  ╔════╗  ┌╌╌╌╌┐  ╔════╗
║ 10 ║  ║  7 ║  ┊  4 ┊  ║  1 ║
╚════╝  ╚════╝  └╌╌╌╌┘  ╚════╝
⏹STOP   ↺RELOAD         ☑TSTPKG
╔════╗  ╔════╗  ╔════╗  ╔════╗
║  9 ║  ║  6 ║  ║  3 ║  ║  0 ║
╚════╝  ╚════╝  ╚════╝  ╚════╝
  ▮▶    ⭢STEP   ⮧INTO   ⮥OUT

• ▮▶ starts, continues, or pauses the program to be debugged.
• ⮧INTO steps into a function call.
• ⭢STEP steps over a line/function call.
• ⏹STOP stops debugging
• ↺RELOAD reloads the program being debugged.
• ☑TSTPKG activates the command "go: test package".

Kdenlive Video Editor

coming soon...

SHIFT Overlay

This layout provides a SHIFT key. Only when pressed and held, two additional keys become active for controlling the brightness of the Keybow LEDs and for switching between multiple keyboard layouts.

Simply pressing and then immediately releasing the SHIFT key without pressing any of the other keys activates the SHIFT layer in other Multibow keyboard layouts that are SHIFT-aware.

NOTE: press and hold SHIFT, then use →LAYOUT and 🔆BRIGHT. The SHIFT key is always active, regardless of keyboard layout. The other keys in this layout become only active while holding SHIFT.

╔════╗  ╔╌╌╌╌╗  ╔╌╌╌╌╗  ┌╌╌╌╌┐
║ 11 ║  ┊  8 ┊  ┊  5 ┊  ┊  2 ┊
╚════╝  ╚╌╌╌╌╝  ╚╌╌╌╌╝  └╌╌╌╌┘
⇑SHIFT  →LAYOUT 🔆BRIGHT
┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐
┊ 10 ┊  ┊  7 ┊  ┊  4 ┊  ┊  1 ┊
└╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘

┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐
┊  9 ┊  ┊  6 ┊  ┊  3 ┊  ┊  0 ┊
└╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘

• press ⇑SHIFT, release ⇑SHIFT: if a keyboard layout has a SHIFT layer, then this activates and deactivates this ⇑SHIFT layer.
• press ⇑SHIFT, tap →LAYOUT, release ⇑SHIFT: switches to next keyboard layout.
• press ⇑SHIFT, tap 🔆BRIGHT, release 🔆BRIGHT: changes the keyboard LED brightness in three different brightness steps (70% → 100% → 40% → 70% → ...).

Empty

Just as its name says: an empty keyboard layout – useful if you want to have also a "no" layout with no functionality whatsoever to switch to. (This layout by courtesy of Margaret Thatcher.)

┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐
┊ 11 ┊  ┊  8 ┊  ┊  7 ┊  ┊  6 ┊
└╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘
┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐
┊ 10 ┊  ┊  7 ┊  ┊  4 ┊  ┊  1 ┊
└╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘
┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐  ┌╌╌╌╌┐
┊  9 ┊  ┊  6 ┊  ┊  3 ┊  ┊  0 ┊
└╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘  └╌╌╌╌┘

Your Own Multikey Keyboard Layout

You may want to start from our template in layouts/keymap-template.lua.

1. copy and rename the new layout file name to something more meaningful.

2. edit your new layout file and change its name which is specified in the kmt.name element:

   km.keymap = {
       -- IMPORTANT: Make sure to change the keymap name to make it unique!
       name="my-cool-layout",
       -- ...
   }
   

3. add key definitions for colors and handlers as necessary, see next for examples.

   • you can specify key handlers either "inline", as you can see from the example mapping for key #0:

     km.keymap = {
       -- ...
       [0] = { c={r=1, g=1, b=1}, press=function() mb.tap("a") end},
     }
     

     This sets the key #0's LED color to white, and emits an "a" press everytime you tap key #0.

   • for more complex handling, you may want to use a dedicated function instead:

     function km.mypress(keyno)
       mb.tap("a")
     end
     
     km.keymap = {
       -- ...
       [1] = { c={r=1, g=1, b=1}, press=km.mypress}
     }
     
     

   • you can also do things on key releases:

     km.keymap = {
       -- ...
       [2] = { c={r=1, g=1, b=1}, release=function() mb.tap("x") end},
     }
     

For more details and examples, please have a look at the keyboard layouts in layouts/vsc-golang.lua and layouts/kdenlive.lua.

Licenses

Multibow is (c) 2019 Harald Albrecht and is licensed under the MIT license, see the LICENSE file.

The file keybow.lua included from pimoroni/keybow-firmware for testing purposes is licensed under the MIT license, as declared by Pimoroni's keybow-firmware GitHub repository.

Developing

Whether you want to dry-run your own keyboard layout or to hack Multibow: use the unit tests which you can find in the spec/ subdirectory. These tests help you in detecting syntax and logic errors early, avoiding the rinse-and-repeat cycle with copying to microSD card, starting the Keybow hardware, and then wondering what went wrong, without any real clue as to what is the cause of failure.

Before your first testing, you'll need to run ./setup-tests.sh once in order to install (on Ubuntu-based distributions) the required system distribution and LuaRocks packages.

Afterwards, simply run busted while in the multibow repository root directory to run all tests. For instance, run busted spec/layout/kdenlive_spec.lua to unit test a specific keyboard layout (or set of layouts).