zmk/zmk-nodefree-config

zmk-nodefree-config

ZMK lets user customize their keyboard layout by providing a Devicetree file (.keymap). The specific syntax requirements of the Devicetree file format can, however, make this process a bit daunting for new users.

This repository provides simple convenience macros that simplify the configuration for many common use cases. It results in a "node-free" user configuration with a more streamlined syntax. Check out example.keymap to see it in action.

Usage overview

1. Copy the file helper.dtsi from this repository into the "config" folder of your private zmk-config repository
2. Source helper.dtsi near the top of your .keymap file:

   #include "helper.dtsi"
   

3. Customize your keyboard's .keymap file. See example.keymap or my personal zmk-config for a complete configuration, and read the documentation below for details.

Usage details

helper.dtsi provides two convenience macros. ZMK_BEHAVIOR creates new behaviors, and ZMK_LAYER adds new layers to your keymap.

ZMK_BEHAVIOR

The macro is invoked by calling ZMK_BEHAVIOR(name, type, specification), expecting 3 arguments:

• name is a unique string chosen by the user (e.g., my_behavior). It can later be used to reference the new behavior by preceding it by "&" (e.g., &my_behavior)
• type selects the behavior that is created. It must be one of the following: caps_word, hold_tap, key_repeat, macro, mod_morph, sticky_key or tap_dance. Note that two-word types use underscores ("_") to separate words.
• specification contains the code customizing the new behavior. It should contain the body of the corresponding ZMK behavior configuration without the label, #binding-cells and compatible properties and without the surrounding node-specification.

Example 1: Creating a custom "homerow mod" tap-hold behavior

ZMK_BEHAVIOR(hrm, hold_tap,
    flavor = "balanced";
    tapping-term-ms = <280>;
    quick-tap-ms = <125>;
    global-quick-tap;
    bindings = <&kp>, <&kp>;
)

The new behavior can be added to the keymap-layout using &hrm (e.g., &hrm LSHIFT T creates a key that yields T on tap and LSHIFT on hold, using the custom configuration above).

Example 2: Creating a custom tap-dance key

ZMK_BEHAVIOR(ss_cw, tap_dance,
    tapping-term-ms = <200>;
    bindings = <&sk LSHFT>, <&caps_word>;
)

The new behavior can be added to the keymap-layout using &ss_cw. The key yields sticky-shift on tap and caps-word on double tap;

Example 3: Creating a custom "win-sleep" macro

ZMK_BEHAVIOR(win_sleep, macro,
    wait-ms = <100>;
    tap-ms = <5>;
    bindings = <&kp LG(X) &kp U &kp S>;
)

This creates a "Windows sleep key" that can be added to the keymap-layout using &win_sleep.

ZMK_LAYER

The function is invoked by calling ZMK_LAYER(name, layout), expecting 2 arguments:

• name is a unique identifier string chosen by the user (it isn't used elsewhere)
• layout provides the layout specification using the same syntax as the bindings property of the ZMK keymap configuration

Multiple layers can be defined with repeated calls of ZMK_LAYER. They will be ordered in the same order in which they are created, with the first-specified layer being the "lowest" one (see here for details).

Example usage

ZMK_KEYMAP(default_layer,
     // ╭─────────────┬─────────────┬─────────────┬─────────────┬─────────────╮   ╭─────────────┬─────────────┬─────────────┬─────────────┬─────────────╮
          &kp Q         &kp W         &kp F         &kp P         &kp B             &kp J         &kp L         &kp U         &kp Y         &kp SQT
     // ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤   ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤
          &hrm LGUI A   &hrm LALT R   &hrm LCTRL S  &hrm LSHFT T  &kp G             &kp M         &hrm RSHFT N  &hrm LCTRL E  &hrm LALT I   &hrm LGUI O
     // ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤   ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤
          &kp Z         &kp X         &kp C         &kp D         &kp V             &kp K         &kp H         &kp COMMA     &kp DOT       &kp SEMI
     // ╰─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤   ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤
                                      &kp ESC       &lt NAV SPACE &kp TAB           &kp RET       &ss_cw        &bs_del_num
     //                             ╰─────────────┴──── ────────┴─────────────╯   ╰─────────────┴─────────────┴─────────────╯
)