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.***
+***NOTE: This is updated for QMK but this is still work in progress. This may still be inconsistent with the source code.***
+
+QMK is based on TMK. Understanding the essential changes made should help you understand variable names etc.
+
+## TMK vs. QMK
+
+| Firmware |TMK |QMK |
+|---------------------------|-----------------------|-------------------------|
+| Maintainer |hasu |Jack Humbert et al. |
+| Build path customization | `TMK_DIR = ...` | `include .../Makefile` |
+| `keymaps` data | 3D array of `uint8_t` holding **keycode** | 3D array of `uint16_t` holding **action code** |
+| `fn_actions` data | 1D array of `uint16_t` holding **action code** | 1D array of `uint16_t` holding **action code** |
+
+Since QMK is based on TMK and uses major portion of TMK code as is, understanding the essential changes made should help you understand the code.
## 0. Keymap and layers
-**Keymap** is comprised of multiple layers of key layout, you can define **32 layers** at most.
-**Layer** is an array of **keycodes** to define **actions** for each physical keys.
-respective layers can be validated simultaneously. Layers are indexed with 0 to 31 and higher layer has precedence.
+In QMK, **`const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS]`** holds multiple **layers** of keymap information in **16 bit** data holding the **action code**. You can define **32 layers** at most.
+
+For trivial key definitions, the higher 8 bits of the **action code** are all 0 and the lower 8 bits holds the USB HID usage code generated by the key as **keycode**.
- Keymap: 32 Layers Layer: Keycode matrix
+Respective layers can be validated simultaneously. Layers are indexed with 0 to 31 and higher layer has precedence.
+
+ Keymap: 32 Layers Layer: action code matrix
----------------- ---------------------
- stack of layers array_of_keycode[row][column]
+ stack of layers array_of_action_code[row][column]
____________ precedence _______________________
/ / | high / ESC / F1 / F2 / F3 ....
31 /___________// | /-----/-----/-----/-----
0 /___________/ V low 0 `--------------------------
+Sometimes, the action code stored in keymap may be referred as keycode in some documents due to the TMK history.
+
+### 0.1 Keymap layer status
+Keymap layer has its state in two 32 bit parameters:
-### 0.1 Keymap status
-Keymap has its state in two parameters:
-**`default_layer`** indicates a base keymap layer(0-31) 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.
+* **`default_layer_state`** indicates a base keymap layer(0-31) which is always valid and to be referred.
+* **`layer_state`** () has current on/off status of the layer on its each bit.
+Keymap has its state in two parameter **`default_layer`** indicates a base keymap layer(0-31) 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 switch key layout completely, say you want Colmak instead of Qwerty.
### 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.
+You can place `KC_TRANS` on overlay layer changes just part of layout to fall back on lower or base layer.
+Key with `KC_TRANS` (`KC_TRNS` and `_______` are the alias) doesn'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.
+Keymap in this QMK is **`static const uint16_t PROGMEM 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. It holds the 16 bit quantum keycode (action code).
-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,
+> Please note that keymap in the TMK, which QMK was forked from, is **`static const uint8_t PROGMEM keymaps[]`** C array which holds the 8 bit keycode (~USB HID usage code).
- `Fn0` is a **momentary layer switching** key, you can use keys on Cursor layer while holding the key.
+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, 'FN' and 'MOUSE'.
- `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.
+In this example,
- `Fn2` is a **toggle layer switch** key, you can stay switched layer after releasing the key unlike momentary switching.
+ `MO(layer)` is a **momentary layer switching** key.
You can find other keymap definitions in file `keymap.c` located on project directories.
+```
+/*
+ * dbroqua HHKB Layout
+ */
+#include "hhkb.h"
+
+#define BASE 0
+#define FN 1
+#define MOUSE 2
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ /* BASE Level: Default Layer
+ * ,-----------------------------------------------------------------------------------------.
+ * | Esc | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | - | = | \ | ` |
+ * |-----------------------------------------------------------------------------------------+
+ * | Tab | Q | W | E | R | T | Y | U | I | O | P | [ | ] | Bksp |
+ * |-----------------------------------------------------------------------------------------+
+ * | Ctrl | A | S | D | F | G | H | J | K | L | ; | ' | Enter |
+ * |-----------------------------------------------------------------------------------------+
+ * | Shift | Z | X | C | V | B | N | M | , | . | / | Shift | fn |
+ * +-----------------------------------------------------------------------------------------+
+ * | Gui | Alt | Space | AltGr |Mouse|
+ * `----------------------------------------------------------------´
+ */
+ [BASE] = KEYMAP(
+ KC_ESC, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL, KC_BSLS, KC_GRV, \
+ KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_BSPC, \
+ KC_LCTL, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_ENT, \
+ KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, MO(FN), \
+ KC_LGUI, KC_LALT, /* */ KC_SPC, KC_RALT, MO(MOUSE)
+ ),
+
+ /* FN Layer
+ * ,-----------------------------------------------------------------------------------------.
+ * | Pwr | F1 | F2 | F3 | F4 | F5 | F6 | F7 | F8 | F9 | F0 | F11 | F12 | Ins | Del|
+ * |-----------------------------------------------------------------------------------------+
+ * | Caps | | | | | | | |PrtSc| Slck| Paus| Up | | |
+ * |-----------------------------------------------------------------------------------------+
+ * | | Vol-| Vol+| Mute| | | * | / | Home| PgUp| Left |Right| |
+ * |-----------------------------------------------------------------------------------------+
+ * | | Prev| Play| Next| | | + | - | End |PgDwn| Down| | |
+ * +-----------------------------------------------------------------------------------------+
+ * | | | | Stop | |
+ * `----------------------------------------------------------------´
+ */
+ [FN] = KEYMAP(
+ KC_PWR, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_INS, KC_DEL, \
+ KC_CAPS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_PSCR, KC_SLCK, KC_PAUS, KC_UP, KC_TRNS, KC_TRNS, \
+ KC_TRNS, KC_VOLD, KC_VOLU, KC_MUTE, KC_TRNS, KC_TRNS, KC_PAST, KC_PSLS, KC_HOME, KC_PGUP, KC_LEFT, KC_RGHT, KC_TRNS, \
+ KC_TRNS, KC_MPRV, KC_MPLY, KC_MNXT, KC_TRNS, KC_TRNS, KC_PPLS, KC_PMNS, KC_END, KC_PGDN, KC_DOWN, KC_TRNS, KC_TRNS, \
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_MSTP, KC_TRNS
+ ),
+
+ /* MOUSE Layer
+ * ,-----------------------------------------------------------------------------------------.
+ * | | | | | | | | | | | | | | | |
+ * |-----------------------------------------------------------------------------------------+
+ * | | | WUp | | | | | | | | Btn1| Up | Btn2| |
+ * |-----------------------------------------------------------------------------------------+
+ * | | WLt | WDn | WRt | | | | | | | Left |Right| |
+ * |-----------------------------------------------------------------------------------------+
+ * | | | | | | | | | | Btn3| Down| | |
+ * +-----------------------------------------------------------------------------------------+
+ * | | | | | |
+ * `----------------------------------------------------------------´
+ */
+ [MOUSE] = KEYMAP(
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, \
+ KC_TRNS, KC_TRNS, KC_WH_U, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_BTN1, KC_MS_U, KC_BTN2, KC_TRNS, \
+ KC_TRNS, KC_WH_L, KC_WH_D, KC_WH_R, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_MS_L, KC_MS_R, KC_TRNS, \
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_BTN3, KC_MS_D, KC_TRNS, KC_TRNS, \
+ KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+ )
+};
+
+const uint16_t PROGMEM fn_actions[] = {
+
+};
+
+const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
+{
+ // MACRODOWN only works in this function
+ switch(id) {
+ case 0:
+ if (record->event.pressed) {
+ register_code(KC_RSFT);
+ } else {
+ unregister_code(KC_RSFT);
+ }
+ break;
+ }
+ return MACRO_NONE;
+};
+```
- 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_LAYER_MOMENTARY(1), // FN0
- ACTION_LAYER_TAP_KEY(2, KC_SCLN), // FN1
- ACTION_LAYER_TOGGLE(2), // FN2
- };
+## 1. Keycode
+See [`tmk_core/common/keycode.h`](../tmk_core/common/keycode.h) or keycode table below for the detail. Keycode is internal **8bit code** to indicate action performed on key in keymap. Keycodes are based on [HID Usage Keyboard/Keypad Page(0x07)](http://www.usb.org/developers/hidpage/Hut1_12v2.pdf) plus special codes in the `0xA5-DF` range.
+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 control keys, System control keys and Mousekeys.
+keymaps[]
+In `KEYMAP()` macro, TMK recommends you to keep prefix part `KC_` of keycode to keep keymap compact. For example, just use `A` instead you place `KC_A` in `KEYMAP()`. But this doesn't apply for QMK.
-## 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.
+The `KEYMAP()` macro defines correspondence between the physical key location to the electrical key connection.
- ***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()`.
+Some keycodes has 7-letter **short name** such as `KC_COMM` in addition to descriptive name `KC_COMMA`, you'll prefer short one in `KEYMAP()`.
### 1.0 Other key
-- `KC_NO` for no aciton
+- `KC_NO` for no action
- `KC_TRNS` for layer transparency (See above)
### 1.1 Normal key
- `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.***
+You don't need to use this functionality under QMK since this is a backward compatibility functionality. Unlike TMK, you can write action code itself directly in **`static const uint16_t PROGMEM keymaps[]`** C array using `MO(layer)`, etc.
+
+`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` keycode indicates the action defined in first element of the array. ***Only 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
+[HID_usage]: http://www.usb.org/developers/hidpage/Hut1_12v2.pdf
## 2. Action
See [`common/action_code.h`](../common/action_code.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 compared to using jsut keycodes. To avoid this waste 8bit keycodes are used in `KEYMAP()` instead of action codes.
+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 compared to using just 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[]`.***
#### 2.1.2 Modified key
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.
+Say you want to assign a key to `Shift + 1` to get character *'!'* or `Alt + Tab` to switch application windows.
ACTION_MODS_KEY(MOD_LSFT, KC_1)
ACTION_MODS_KEY(MOD_LALT, KC_TAB)
This sets Default Layer to given parameter `layer` and activate it.
- ACTION_DEFAULT_LAYER(layer)
+ ACTION_DEFAULT_LAYER_SET(layer)
-#### 2.2.2 Momentary Switch
+#### 2.2.2 Momentary
Turns on `layer` momentarily while holding, in other words it activates when key is pressed and deactivate when released.
ACTION_LAYER_MOMENTARY(layer)
ACTION_LAYER_BIT_XOR(part, bits, on)
ACTION_LAYER_BIT_SET(part, bits, on)
-These actions works with prameters as following code.
+These actions works with parameters as following code.
uint8_t shift = part*4;
uint32_t mask = (bits&0x10) ? ~(0xf<<shift) : 0;
MACRO( I(255), T(H), T(E), T(L), T(L), W(255), T(O), END )
#### 2.3.1 Macro Commands
-- **I()** change interavl of stroke.
+- **I()** change interval of stroke.
- **D()** press key
- **U()** release key
- **T()** type key(press and release)
#### 2.3.2 Examples
-***TODO: sample impl***
-See `keyboard/hhkb/keymap.c` for sample.
+***TODO: sample implementation***
+See `keyboards/hhkb/keymap.c` for sample.
void keymap_call_function(keyrecord_t *event, uint8_t id, uint8_t opt)
-This C function is called every time key is operated, argument `id` selects action to be performed and `opt` can be used for option. Functon `id` can be 0-255 and `opt` can be 0-15.
+This C function is called every time key is operated, argument `id` selects action to be performed and `opt` can be used for option. Function `id` can be 0-255 and `opt` can be 0-15.
`keyrecord_t` is comprised of key event and tap count. `keyevent_t` indicates which and when key is pressed or released. From `tap_count` you can know tap state, 0 means no tap. These information will be used in user function to decide how action of key is performed.
uint8_t row;
} key_t;
-***TODO: sample impl***
-See `keyboard/hhkb/keymap.c` for sample.
+***TODO: sample implementation***
+See `keyboards/hhkb/keymap.c` for sample.
ACTION_BACKLIGHT_STEP()
+Turn a specific backlight level on or off.
+
+ ACTION_BACKLIGHT_LEVEL(1)
+
#### 2.5.2 Turn on / off backlight
Turn the backlight on and off without changing level.
+### 2.6 Swap-Hands Action
+The swap-hands action allows support for one-handed keyboards without requiring a separate layer. Set `ONEHAND_ENABLE` in the Makefile and define a `hand_swap_config` entry in your keymap. Now whenever the `ACTION_SWAP_HANDS` command key is pressed the keyboard is mirrored. For instance, to type "Hello, World" on QWERTY you would type `^Ge^s^s^w^c W^wr^sd`
+
+### 2.6.1 Configuration
+The configuration table is a simple 2-dimensional array to map from column/row to new column/row. Example `hand_swap_config` for Planck:
+
+```
+const keypos_t hand_swap_config[MATRIX_ROWS][MATRIX_COLS] = {
+ {{11, 0}, {10, 0}, {9, 0}, {8, 0}, {7, 0}, {6, 0}, {5, 0}, {4, 0}, {3, 0}, {2, 0}, {1, 0}, {0, 0}},
+ {{11, 1}, {10, 1}, {9, 1}, {8, 1}, {7, 1}, {6, 1}, {5, 1}, {4, 1}, {3, 1}, {2, 1}, {1, 1}, {0, 1}},
+ {{11, 2}, {10, 2}, {9, 2}, {8, 2}, {7, 2}, {6, 2}, {5, 2}, {4, 2}, {3, 2}, {2, 2}, {1, 2}, {0, 2}},
+ {{11, 3}, {10, 3}, {9, 3}, {8, 3}, {7, 3}, {6, 3}, {5, 3}, {4, 3}, {3, 3}, {2, 3}, {1, 3}, {0, 3}},
+};
+```
+
+Note that the array indices are reversed same as the matrix and the values are of type `keypos_t` which is `{col, row}` and all values are zero-based. In the example above, `hand_swap_config[2][4]` (third row, fifth column) would return {7, 2} (third row, eighth column).
+
+### 2.6.2 Advanced Swap Commands
+- **`ACTION_SWAP_HANDS()`** Swaps hands when pressed, returns to normal when released (momentary).
+- **`ACTION_SWAP_HANDS_TOGGLE()`** Toggles swap on and off with every keypress.
+- **`ACTION_SWAP_HANDS_TAP_TOGGLE()`** Toggles with a tap; momentary when held.
+- **`ACTION_SWAP_HANDS_TAP_KEY(key)`** Sends `key` with a tap; momentary swap when held.
+- **`ACTION_SWAP_HANDS_ON_OFF()`** Alias for `ACTION_SWAP_HANDS()`
+- **`ACTION_SWAP_HANDS_OFF_ON()`** Momentarily turns off swap.
+- **`ACTION_SWAP_HANDS_ON()`** Turns on swapping and leaves it on.
+- **`ACTION_SWAP_HANDS_OFF()`** Turn off swapping and leaves it off. Good for returning to a known state.
+
+
+
## 3. Layer switching Example
There are some ways to switch layer with 'Layer' actions.
ACTION_LAYER_MOMENTARY(1)
-Note that after switching on press the actions on destinaton layer(Layer 1) are perfomed.
-***Thus you shall need to place an action to go back on destination layer***, or you will be stuck in destination layer without way to get back. Usually you need to palce same action or 'KC_TRNS` on destination layer to get back.
+Note that after switching on press the actions on destination layer(Layer 1) are performed.
+***Thus you shall need to place an action to go back on destination layer***, or you will be stuck in destination layer without way to get back. Usually you need to place same action or 'KC_TRNS` on destination layer to get back.
### 3.2 Toggle switching
ACTION_LAYER_TAP_KEY(2, KC_SCLN)
-With this you can place a layer switching action on normal key like ';' without losing its original key register function. This action allows you to have layer switchig action without necessity of a dedicated key. It means you can have it even on home row of keyboard.
+With this you can place a layer switching action on normal key like ';' without losing its original key register function. This action allows you to have layer switching action without necessity of a dedicated key. It means you can have it even on home row of keyboard.
+### 3.5 Momentary switching with Modifiers
+This registers modifier key(s) simultaneously with layer switching.
+
+ ACTION_LAYER_MODS(2, MOD_LSFT | MOD_LALT)
+
+
+
## 4. Tapping
Tapping is to press and release a key quickly. Tapping speed is determined with setting of `TAPPING_TERM`, which can be defined in `config.h`, 200ms by default.
[dual_role]: http://en.wikipedia.org/wiki/Modifier_key#Dual-role_keys
+When user hold a key after tap, it repeat the tapped key rather to hold a modifier key.
+If you prefer to hold a modifier instead, define `TAPPING_FORCE_HOLD` in `config.h`.
+See https://github.com/qmk/qmk_firmware/issues/889 for the detail.
### 4.2 Tap Toggle
-This is a feature to assign both toggle layer and momentary switch layer action to just same one physical key. It works as mementary layer switch when holding a key but toggle switch with several taps.
+This is a feature to assign both toggle layer and momentary switch layer action to just same one physical key. It works as momentary layer switch when holding a key but toggle switch with several taps.
ACTION_LAYER_TAP_TOGGLE(1)
### 4.3 Oneshot Modifier
-This runs onetime effect swhich modify only on just one following key. It works as normal modifier key when holding down while oneshot modifier when tapping.
+This runs onetime effects which modify only on just one following key. It works as normal modifier key when holding down while oneshot modifier when tapping. The behavior of oneshot modifiers is similar to the [sticky keys](https://en.wikipedia.org/wiki/StickyKeys) functionality found in most operating systems.
ACTION_MODS_ONESHOT(MOD_LSFT)
-Say you want to type 'The', you have to push and hold Shift key before type 't' then release it before type 'h' and 'e', otherwise you'll get 'THe' or 'the' unintentionally. With Oneshot Modifier you can tap Shift then type 't', 'h' and 'e' normally, you don't need to holding Shift key properly here. This mean you can realease Shift before 't' is pressed down.
+Oneshot layer key:
+
+ ACTION_LAYER_ONESHOT(MY_LAYER)
+
+Say you want to type 'The', you have to push and hold Shift key before type 't' then release it before type 'h' and 'e', otherwise you'll get 'THe' or 'the' unintentionally. With Oneshot Modifier you can tap Shift then type 't', 'h' and 'e' normally, you don't need to holding Shift key properly here. This mean you can release Shift before 't' is pressed down.
Oneshot effect is cancel unless following key is pressed down within `ONESHOT_TIMEOUT` of `config.h`. No timeout when it is `0` or not defined.
+Most implementations of sticky keys allow you to lock a modifier by double tapping the modifier. The layer then remains locked untill the modifier is tapped again. To enable this behaviour for oneshot modifiers set `ONESHOT_TAP_TOGGLE` to the number taps required. The feature is disabled if `ONESHOT_TAP_TOGGLE<2` or not defined.
+
### 4.4 Tap Toggle Mods
Similar to layer tap toggle, this works as a momentary modifier when holding, but toggles on with several taps. A single tap will 'unstick' the modifier again.
## 5. Legacy Keymap
-This was used in prior version and still works due to legacy support code in `common/keymap.c`. Legacy keymap doesn't support many of features that new keymap offers. ***It is not recommended to use Legacy Keymap for new project.***
-
-To enable Legacy Keymap support define this macro in `config.h`.
-
- #define USE_LEGACY_KEYMAP
+In QMK, `tmk_core/common/keymap.c` is missing and its replacement `quantum/keymap_common.c` lacks Legacy Keymap support.
Legacy Keymap uses two arrays `fn_layer[]` and `fn_keycode[]` to define Fn key. The index of arrays corresponds with postfix number of `Fn` key. Array `fn_layer[]` indicates destination layer to switch and `fn_keycode[]` has keycodes to send when tapping `Fn` key.
-In following setting example, `Fn0`, `Fn1` and `Fn2` switch layer to 1, 2 and 2 respectively. `Fn2` registers `Space` key when tapping while `Fn0` and `Fn1` doesn't send any key.
+In the following legacy keymap setting example, `Fn0`, `Fn1` and `Fn2` switch layer to 1, 2 and 2 respectively. `Fn2` registers `Space` key when tapping while `Fn0` and `Fn1` doesn't send any key.
static const uint8_t PROGMEM fn_layer[] = {
1, // Fn0
KC_SPC, // Fn2
};
+Under QMK, these can be realized using action code ACTION_LAYER_TAP_KEY(1, KC_NO), ACTION_LAYER_TAP_KEY(2, KC_NO), and ACTION_LAYER_TAP_KEY(2, KC_SPC) in the `keymaps` directly.
## 6. Terminology
***TBD***
projects / qmk_firmware.git / blobdiff