Keymap framework - how to define your keymap ============================================ ***NOTE: This is not final version, may be inconsistent with source code and changed occasionally for a while.*** ## 0. Keymap and layers **Keymap** is comprised of multiple layers of key layout, you can define **16** layers at most. **Layer** is an array of **keycodes** to define **actions** on each physical keys. respective layers can be validated simultaneously. Layers are indexed with 0 to 15 and higher layer has precedence. Keymap with 16 Layers Layer: array of Keycodes --------------------- ------------------------ stack of layers content of layer ____________ precedence _______________________ / / | high / ESC / F1 / F2 / F3 .... 15 /___________// | /-----/-----/-----/----- 14 /___________// | / TAB / / / .... 13 /___________/_ | /-----/-----/-----/----- : / : : : : : / | /LCtrl/ / / .... 3 /___________// | : / : : : : 2 /___________// | 2 `-------------------------- 1 /___________// | 1 `-------------------------- 0 /___________/ V low 0 `-------------------------- ### 0.1 Keymap status Keymap has its state in two parameters: **`default_layer`** indicates a base keymap layer(0-15) which is always valid and to be referred, **`keymap_stat`** is 16bit variable which has current on/off status of layers on its each bit. Keymap layer '0' is usually `default_layer` and which is the only valid layer and other layers is initially off after boot up firmware, though, you can configured them in `config.h`. To change `default_layer` will be useful when you want to switch key layout completely, say you use Colmak instead of Qwerty. Initial state of Keymap Change base layout ----------------------- ------------------ 15 15 14 14 13 13 : : 3 3 ____________ 2 ____________ 2 / / 1 / / ,->1 /___________/ ,->0 /___________/ | 0 | | `--- default_layer = 0 `--- default_layer = 1 keymap_stat = 0x0001 keymap_stat = 0x0002 On the other hand, you shall change `keymap_state` to overlay base layer with some layers for feature such as navigation keys, function key(F1-F12), media keys or special actions. Overlay feature layer --------------------- bit|status ____________ ---+------ 15 / / 15 | 0 14 /___________// -----> 14 | 1 13 /___________/ -----> 13 | 1 : : | 3 ____________ 3 | 0 2 / / 2 | 0 ,->1 /___________/ -----> 1 | 1 | 0 0 | 0 | | `--- default_layer = 1 | keymap_stat = 0x6002 <-----' ### 0.2 Layer Precedence and Transparency Note that ***higher layer has higher priority on stack of layers***, namely firmware falls down from top layer to bottom to look up keycode. Once it spots keycode other than **`KC_TRNS`**(transparent) on a layer it stops searching and lower layers aren't referred. You can place `KC_TRNS` on overlay layer changes just part of layout to fall back on lower or base layer. Key with `KC_TRANS` doen't has its own keycode and refers to lower valid layers for keycode, instead. See example below. ### 0.3 Keymap Example Keymap is **`keymaps[]`** C array in fact and you can define layers in it with **`KEYMAP()`** C macro and keycodes. To use complex actions you need to define `Fn` keycode in **`fn_actions[]`** array. This is a keymap example for [HHKB](http://en.wikipedia.org/wiki/Happy_Hacking_Keyboard) keyboard. This example has three layers, 'Qwerty' as base layer, 'Cursor' and 'Mousekey'. In this example, `Fn0` is a **momentary layer switching** key, you can use keys on Cursor layer while holding the key. `Fn1` is a momentary layer switching key with tapping feature, you can get semicolon **';'** with taping the key and switch layers while holding the key. The word **'tap'** or **'tapping'** mean to press and release a key quickly. `Fn2` is a **toggle layer switch** key, you can stay switched layer after releasing the key unlike momentary switching. You can find other keymap definitions in file `keymap.c` located on project directories. static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = { /* 0: Qwerty * ,-----------------------------------------------------------. * |Esc| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =| \| `| * |-----------------------------------------------------------| * |Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]|Backs| * |-----------------------------------------------------------| * |Contro| A| S| D| F| G| H| J| K| L|Fn1| '|Enter | * |-----------------------------------------------------------| * |Shift | Z| X| C| V| B| N| M| ,| .| /|Shift |Fn0| * `-----------------------------------------------------------' * |Gui|Alt |Space |Alt |Fn2| * `-------------------------------------------' */ KEYMAP(ESC, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, MINS,EQL, BSLS,GRV, \ TAB, Q, W, E, R, T, Y, U, I, O, P, LBRC,RBRC,BSPC, \ LCTL,A, S, D, F, G, H, J, K, L, FN1, QUOT,ENT, \ LSFT,Z, X, C, V, B, N, M, COMM,DOT, SLSH,RSFT,FN0, \ LGUI,LALT, SPC, RALT,FN2), /* 1: Cursor(HHKB mode) * ,-----------------------------------------------------------. * |Pwr| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Ins|Del| * |-----------------------------------------------------------| * |Caps | | | | | | | |Psc|Slk|Pus|Up | |Backs| * |-----------------------------------------------------------| * |Contro|VoD|VoU|Mut| | | *| /|Hom|PgU|Lef|Rig|Enter | * |-----------------------------------------------------------| * |Shift | | | | | | +| -|End|PgD|Dow|Shift | | * `-----------------------------------------------------------' * |Gui |Alt |Space |Alt |Gui| * `--------------------------------------------' */ KEYMAP(PWR, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, INS, DEL, \ CAPS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,PSCR,SLCK,PAUS,UP, TRNS,BSPC, \ LCTL,VOLD,VOLU,MUTE,TRNS,TRNS,PAST,PSLS,HOME,PGUP,LEFT,RGHT,ENT, \ LSFT,TRNS,TRNS,TRNS,TRNS,TRNS,PPLS,PMNS,END, PGDN,DOWN,RSFT,TRNS, \ LGUI,LALT, SPC, RALT,RGUI), /* 2: Mousekey * ,-----------------------------------------------------------. * |Esc| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Ins|Del| * |-----------------------------------------------------------| * |Tab | | | | | |MwL|MwD|MwU|MwR| | | |Backs| * |-----------------------------------------------------------| * |Contro| | | | | |McL|McD|McU|McR| | |Return | * |-----------------------------------------------------------| * |Shift | | | | |Mb3|Mb2|Mb1|Mb4|Mb5| |Shift | | * `-----------------------------------------------------------' * |Gui |Alt |Mb1 |Alt | | * `--------------------------------------------' * Mc: Mouse Cursor / Mb: Mouse Button / Mw: Mouse Wheel */ KEYMAP(ESC, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, INS, DEL, \ TAB, TRNS,TRNS,TRNS,TRNS,TRNS,WH_L,WH_D,WH_U,WH_R,TRNS,TRNS,TRNS,BSPC, \ LCTL,TRNS,ACL0,ACL1,ACL2,TRNS,MS_L,MS_D,MS_U,MS_R,TRNS,QUOT,ENT, \ LSFT,TRNS,TRNS,TRNS,TRNS,BTN3,BTN2,BTN1,BTN4,BTN5,SLSH,RSFT,TRNS, \ LGUI,LALT, BTN1, RALT,TRNS), }; static const uint16_t PROGMEM fn_actions[] = { ACTION_KEYMAP_MOMENTARY(1), // FN0 ACTION_KEYMAP_TAP_KEY(2, KC_SCLN), // FN1 ACTION_KEYMAP_TOGGLE(2), // FN2 }; ## 1. Keycode See [`common/keycode.h`](../common/keycode.h) or keycode table below for the detail. Keycode is internal **8bit code** to inidicate action performed on key in keymap. Keycode has `KC_` prefixed symbol respectively. Most of keycodes like `KC_A` have simple action registers key to host on press and unregister on release, while some of other keycodes has some special actions like `Fn` keys, Media contorl keys, System control keys and Mousekeys. ***In `KEYMAP()` macro you should omit prefix part `KC_` of keycode to keep keymap compact.*** For example, just use `A` instead you place `KC_A` in `KEYMAP()`. Some keycodes has 4-letter **short name** in addition to descriptive name, you'll prefer short one in `KEYMAP()`. ### 1.0 Other key - `KC_NO` for no aciton - `KC_TRNS` for layer transparency (See above) ### 1.1 Normal key - `KC_A` to `KC_Z`, `KC_1` to `KC_0` for alpha numeric key - `KC_MINS`, `KC_EQL`, `KC_GRV`, `KC_RBRC`, `KC_LBRC`, `KC_COMM`, `KC_DOT`, `KC_BSLS`, `KC_SLSH`, `KC_SCLN`, `KC_QUOT` - `KC_ESC`, `KC_TAB`, `KC_SPC`, `KC_BSPC`, `KC_ENT`, `KC_DEL`, `KC_INS` - `KC_UP`, `KC_DOWN`, `KC_RGHT`, `KC_LEFT`, `KC_PGUP`, `KC_PGDN`, `KC_HOME`, `KC_END` - `KC_CAPS`, `KC_NLCK`, `KC_SLCK`, `KC_PSCR`, `KC_PAUS`, `KC_APP`, `KC_F1` to `KC_F24` - `KC_P1` to `KC_P0`, `KC_PDOT`, `KC_PCMM`, `KC_PSLS`, `KC_PAST`, `KC_PMNS`, `KC_PPLS`, `KC_PEQL`, `KC_PENT` for keypad. ### 1.2 Modifier There are 8 modifiers which has discrimination between left and right. - `KC_LCTL` and `KC_RCTL` for Control - `KC_LSFT` and `KC_RSFT` for Shift - `KC_LALT` and `KC_RALT` for Alt - `KC_LGUI` and `KC_RGUI` for Windows key or Command key in Mac ### 1.3 Mousekey - `KC_MS_U`, `KC_MS_D`, `KC_MS_L`, `KC_MS_R` for mouse cursor - `KC_WH_U`, `KC_WH_D`, `KC_WH_L`, `KC_WH_R` for mouse wheel - `KC_BTN1`, `KC_BTN2`, `KC_BTN3`, `KC_BTN4`, `KC_BTN5` for mouse buttons ### 1.4 System & Media key - `KC_PWR`, `KC_SLEP`, `KC_WAKE` for Power, Sleep, Wake - `KC_MUTE`, `KC_VOLU`, `KC_VOLD` for audio volume control - `KC_MNXT`, `KC_MPRV`, `KC_MSTP`, `KC_MPLY`, `KC_MSEL` for media control - `KC_MAIL`, `KC_CALC`, `KC_MYCM` for application launch - `KC_WSCH`, `KC_WHOM`, `KC_WBAK`, `KC_WFWD`, `KC_WSTP`, `KC_WREF`, `KC_WFAV` for web browser operation ### 1.5 Fn key `KC_FNnn` are keycodes for `Fn` key which not given any actions at the beginning unlike most of keycodes has its own inborn action. To use these keycodes in `KEYMAP` you need to assign action you want at first. Action of `Fn` key is defined in `fn_actions[]` and its index of the array is identical with number part of `KC_FNnn`. Thus `KC_FN0` keyocde indicates the action defined in first element of the array. ***32 `Fn` keys can be defined at most.*** ### 1.6 Keycode Table See keycode table in [`doc/keycode.txt`](./keycode.txt) for description of keycodes. In regard to implementation side most of keycodes are identical with [HID usage][HID_usage](pdf) sent to host for real and some virtual keycodes are defined to support special actions. [HID_usage]: http://www.usb.org/developers/devclass_docs/Hut1_11.pdf ## 2. Action See [`common/action.h`](../common/action.h). Action is a **16bit code** and defines function to perform on events of a key like press, release, holding and tapping. Most of keys just register 8bit scancode to host, but to support other complex features needs 16bit extended action codes internally. However, using 16bit action codes in keymap results in double size in memory against using jsut keycodes. To avoid this waste 8bit keycodes are used in `KEYMAP` instead of action codes. ***You can just use keycodes of `Normal key`, `Modifier`, `Mousekey` and `System & Media key` in keymap*** to indicate corresponding actions instead of using action codes. While ***to use other special actions you should use keycode of `Fn` key defined in `fn_actions[]`.*** Usually action codes are needed only when you want to use layer switching, or ### 2.1 Key action This is a simple action that registers scancodes(HID usage in fact) to host on press event of key and unregister on release. #### 2.1.1 Normal key and Modifier This action usually won't be used expressly because you can use keycodes in `KEYMAP()` instead. You can define `Key` action on *'A'* key and *'left shift'* modifier with: ACTION_KEY(KC_A) ACTION_KEY(KC_LSHIFT) #### 2.1.2 Key with modifiers This action is comprised of strokes of modifiers and a key. `Macro` action is needed if you want more complex key strokes. Say you want to assign a key to `Shift + 1` to get charactor *'!'* or `Alt + Tab` to switch application windows. ACTION_LMOD_KEY(KC_LSHIFT, KC_1) ACTION_LMOD_KEY(KC_LALT, KC_TAB) Or `Alt,Shift + Tab` can be defined. `ACTION_LMODS_KEY()` requires **4-bit modifier state** and a **keycode** as arguments. See `keycode.h` for `MOD_BIT()` macro. ACTION_LMODS_KEY((MOD_BIT(KC_LALT) | MOD_BIT(KC_LSHIFT)), KC_TAB) ### 2.2 Layer Action These actions operate layers of keymap. Parameters: - layer: 0-15 - on: { press | release | both } #### 2.2.0 Default Layer `default_layer` is layer which always is valid and referred to when actions is not defined on other layers. ##### Return to Default Layer Turns on only `default layer` with clearing other all layers. ACTION_DEFAULT_LAYER ##### Set Default Layer Sets 'default layer' to layer and turn it on. ACTION_DEFAULT_LAYER_SET_TO(layer) ACTION_DEFAULT_LAYER_SET(layer, on) #### 2.2.1 Keymap These actions operate layer status of keymap. ##### Momentary Switch Turns on layer momentary while holding, in other words turn on when key is pressed and off when released. ACTION_KEYMAP_MOMENTARY(layer) ##### Toggle Switch Turns on layer on first type and turns off on next. ACTION_KEYMAP_TOGGLE(layer) ##### Momentary Switch with tap key Turns on layer momentary while holding but registers key on tap. ACTION_KEYMAP_TAP_KEY(layer, key) ##### Momentary Switch with tap toggle Turns on layer momentary while holding but toggles it with serial taps. ACTION_KEYMAP_TAP_TOGGLE(layer) ##### Invert layer Inverts current layer state. If the layer is on it becomes off with this action. ACTION_KEYMAP_INV(layer, on) ##### Turn On layer Turns on layer state. ACTION_KEYMAP_ON(layer, on) Turns on layer state on press and turn off on release. This is identical to **'Switch to layer'** action. ACTION_KEYMAP_ON_OFF(layer) ##### Turn Off layer Turns off layer state. ACTION_KEYMAP_OFF(layer, on) ##### Set layer Turn on layer only. `keymap_stat = (1<