zmkfirmware/zmk

Features

• Keyboard Key Mappings - Provides a comprehensive system for defining complex key layers, macros, and specialized input behaviors.
• Keyboard Firmware - Implements a comprehensive firmware framework for managing keyboard scanning, debouncing, and keymap processing.
• Layered Keymaps - Defines multiple sets of key assignments (layers) that can be toggled to expand keyboard functionality.
• Modular Hardware Composition - Combines controller boards and keyboard shields during the build process to maintain hardware compatibility.
• Firmware Build Configuration - Provides configuration files to manage the compilation of firmware for specific hardware targets.
• Bluetooth Connectivity - Manages wireless pairing and data exchange by advertising the device to host computers and mobile devices.
• Bluetooth Host Profiles - Saves bonding information for multiple hosts and switches between them to direct input.
• Device Topology Definitions - Uses a hierarchical tree structure to define the physical layout and properties of hardware and keymaps.
• Graphical Keymap Configurators - Enables modifying keymap layers and assigning behaviors in real-time without requiring a firmware re-flash.
• HID Emulations - Emulates Human Interface Devices to send keystrokes, mouse movements, and media controls to host systems.
• HID Keycode Emulation - Sends specific keycodes to the connected host based on press, hold, or toggle triggers.
• Input Logic Definitions - Creates custom input logic utilizing macros, tap dances, and time-based triggers.
• Dynamic Layering - Dynamically switches between different sets of key mappings using momentary, toggled, or sticky activations.
• Keyboard Layout Mappings - Maps physical keys to characters and custom behaviors through structured configuration files.
• Board and Shield Definitions - Maps microcontrollers and PCBs into board and shield definitions to match the physical hardware layout.
• Split Keyboard Synchronization - Synchronizes state and input coordinates between two separate microcontrollers in a split keyboard design.
• Standard Keyboard Emulation - Assigns alphanumeric, symbol, and control characters to switches to emulate a traditional keyboard.
• Tap-Hold Key Behaviors - Assigns two different actions to a single key based on whether the key is tapped or held.
• HID Device Implementations - Emulates the Human Interface Device standard to send keyboard and mouse input events to host systems.
• Wireless Split-Half Linking - Connects two sides of a split device wirelessly to transmit data between them.
• Low-Power Wireless Connectivity - Establishes secure Bluetooth Low Energy links for energy-efficient keystroke transmission to host devices.
• Advanced Input Behaviors - Implements advanced input behaviors like hold-taps, tap-dances, and combos to expand key functionality.
• Input Layer Stacks - Organizes key bindings into a stack where the highest active layer takes priority.
• Keyboard Frameworks - Utilizes a modular architecture built on Zephyr RTOS to manage keyboard shields and controller boards.
• Battery Power Optimization - Optimizes wireless battery life through deep sleep states and granular control of peripheral power.
• Configurable Key-to-Command Mappings - Assigns specific actions or keycodes to physical positions or sensors via configuration.
• Global System Settings - Provides centralized interfaces for adjusting global preferences and system-wide hardware parameters.
• Multi-Press Input Triggers - Implements triggers that execute specific behaviors based on the number of consecutive key presses.
• Firmware Build Variants - Generates specialized firmware binaries tailored for different keyboard shields and controllers from a single codebase.
• International Layouts - Provides specialized keycodes for non-English layouts and language-switching functions.
• Key Sequence Patterns - Triggers a predefined list of behaviors or keycodes in a specific sequential order.
• Pointing Device Drivers - Translates low-level events from trackballs, mice, or touchpads into standard pointer behaviors.
• HID Mouse Emulation - Implements mouse report protocols to simulate cursor movement and clicks via keyboard inputs.
• Input Macros - Records and plays back sequences of keystrokes to automate repetitive typing tasks.
• Input Sequence Macros - Executes automated series of hardware inputs via macro recording and playback.
• Hardware Integration - Bridges various PCB architectures and controller boards to ensure software compatibility across different hardware setups.
• Physical Layout Switching - Selects between pre-defined physical key arrangements for the hardware.
• Peripheral Hardware Controllers - Manages a variety of hardware peripherals including rotary encoders and integrated lighting.
• Pointing Hardware Integration - Integrates physical trackpads and trackballs to provide simultaneous keyboard and pointer input.
• Behavior Parameterization - Allows passing additional arguments to bindings to modify actions based on whether a key is tapped or held.
• Conditional Hold Triggers - Limits the hold action of a dual-function key to trigger only when specific other keys are pressed.
• Immediate Action Triggers - Triggers hold behavior instantly upon press and cancels it if the key resolves to a tap.
• Input Timing Logic - Tunes the resolution of dual-function keys using tapping terms and interrupt logic.
• Solo Release Triggers - Provides specialized logic to execute tap actions if a dual-function key is released without other interactions.
• Wireless Peripheral Pairing - Establishes and manages connections between the keyboard peripheral and several Bluetooth hosts simultaneously.
• Battery Power Telemetry - Sends real-time battery power levels to connected host computers and updates on-board OLED or ePaper displays.
• Peripheral Device Pairing - Bonds central controllers to peripherals using hardware addresses to ensure automatic wireless reconnection.
• Input Output Routing - Selects whether keystrokes are sent via USB or Bluetooth when both connections are active.
• Split-Half Synchronization - Establishes a wireless connection between two separate halves through a simultaneous reset.
• Power State Controllers - Provides interfaces for triggering system power events such as sleep and soft-off states to conserve battery.
• Peripheral Power Controllers - Cuts power output to external components to eliminate parasitic battery drain.
• Chorded Key Mappings - Triggers specific outputs when a set of keys is pressed together within a defined time window.
• Navigation and Function Keys - Assigns directional arrows, home/end keys, and function keys to physical switches.
• Firmware Extension Modules - Allows adding third-party modules to a repository to enable support for new behaviors and features.
• Split-Half State Synchronization - Coordinates behaviors across split hardware halves to trigger effects either globally or locally.
• Secure Device Pairing - Uses encryption and long term keys to ensure secure communication between the keyboard and the host device.
• Hardware Reset Triggers - Implements low-level mechanisms to restart firmware or enter bootloader mode for flashing new images.
• Device Power Monitors - Monitors and transmits the remaining power capacity of the device to the connected host.
• Modifier Key Configurations - Configures modifier keys like Shift, Control, and Alt to modify the behavior of other inputs.
• Peripheral Input Drivers - Provides drivers and abstractions for integrating rotary encoders and pointing devices as input controls.
• Rotary Encoder Input - Processes rotational input from physical knobs to trigger specific keycodes or keyboard commands.
• Keypad Input Behaviors - Assigns numeric keypad digits and arithmetic operations to switches for data entry.
• Sticky Modifier Modalities - Implements sticky modifier keys that remain active until the next non-modifier key is pressed.
• Pointer Event Processing - Modifies raw pointer events to scale speed, convert movement to scrolling, or trigger layer changes.

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