openwrt/upstream - upstream openwrt

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author	Michael Büsch <mb@bu3sch.de>	2010-10-16 20:44:25 +0000
committer	Michael Büsch <mb@bu3sch.de>	2010-10-16 20:44:25 +0000
commit	394b152ced4a9319753d2818c63437a71d35e599 (patch)
tree	367987a4bdb7794c7d32770ed43234bb395e700e /target/linux
parent	dc7a68165dcfe62c16d46a1c093b531ebaae441c (diff)
download	upstream-394b152ced4a9319753d2818c63437a71d35e599.tar.gz upstream-394b152ced4a9319753d2818c63437a71d35e599.tar.bz2 upstream-394b152ced4a9319753d2818c63437a71d35e599.zip

omap24xx: Update kernel

SVN-Revision: 23485

Diffstat (limited to 'target/linux')

-rw-r--r--

target/linux/omap24xx/Makefile

1 files changed, 1 insertions, 1 deletions

# Keymap Overview QMK keymaps are defined inside a C source file. The data structure is an array of arrays. The outer array is a list of layer arrays while the inner layer array is a list of keys. Most keyboards define a `KEYMAP()` macro to help you create this array of arrays. ## Keymap and Layers 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**. 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_action_code[row][column] ____________ precedence _______________________ / / | high / ESC / F1 / F2 / F3 .... 31 /___________// | /-----/-----/-----/----- 30 /___________// | / TAB / Q / W / E .... 29 /___________/ | /-----/-----/-----/----- : _:_:_:_:_:__ | : /LCtrl/ A / S / D .... : / : : : : : / | : / : : : : 2 /___________// | 2 `-------------------------- 1 /___________// | 1 `-------------------------- 0 /___________/ V low 0 `-------------------------- Sometimes, the action code stored in keymap may be referred as keycode in some documents due to the TMK history. ### Keymap Layer Status The state of the Keymap layer is determined by two 32 bit parameters: * **`default_layer_state`** indicates a base keymap layer (0-31) which is always valid and to be referred (the default layer). * **`layer_state`** has current on/off status of each layer in its bits. Keymap layer '0' is usually the `default_layer`, with other layers initially off after booting up the firmware, although this can configured differently in `config.h`. It is useful to change `default_layer` when you completely switch a key layout, for example, if you want to switch to Colemak instead of Qwerty. Initial state of Keymap Change base layout ----------------------- ------------------ 31 31 30 30 29 29 : : : : ____________ 2 ____________ 2 / / 1 / / ,->1 /___________/ ,->0 /___________/ | 0 | | `--- default_layer = 0 `--- default_layer = 1 layer_state = 0x00000001 layer_state = 0x00000002 On the other hand, you can change `layer_state` to overlay the base layer with other layers for features such as navigation keys, function keys (F1-F12), media keys, and/or special actions. Overlay feature layer --------------------- bit|status ____________ ---+------ 31 / / 31 | 0 30 /___________// -----> 30 | 1 29 /___________/ -----> 29 | 1 : : | : : ____________ : | : 2 / / 2 | 0 ,->1 /___________/ -----> 1 | 1 | 0 0 | 0 | + `--- default_layer = 1 | layer_state = 0x60000002 <-' ### 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_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. ## Anatomy of a `keymap.c` For this example we will walk through an [older version of the default Clueboard 66% keymap](https://github.com/qmk/qmk_firmware/blob/ca01d94005f67ec4fa9528353481faa622d949ae/keyboards/clueboard/keymaps/default/keymap.c). You'll find it helpful to open that file in another browser window so you can look at everything in context. There are 3 main sections of a `keymap.c` file you'll want to concern yourself with: * [The Definitions](#definitions) * [The Layer/Keymap Datastructure](#layers-and-keymaps) * [Custom Functions](#custom-functions), if any ### Definitions At the top of the file you'll find this: #include QMK_KEYBOARD_H // Helpful defines #define GRAVE_MODS (MOD_BIT(KC_LSHIFT)|MOD_BIT(KC_RSHIFT)|MOD_BIT(KC_LGUI)|MOD_BIT(KC_RGUI)|MOD_BIT(KC_LALT)|MOD_BIT(KC_RALT)) /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * You can use _______ in place for KC_TRNS (transparent) * * Or you can use XXXXXXX for KC_NO (NOOP) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ // Each layer gets a name for readability. // The underscores don't mean anything - you can // have a layer called STUFF or any other name. // Layer names don't all need to be of the same // length, and you can also skip them entirely // and just use numbers. #define _BL 0 #define _FL 1 #define _CL 2 These are some handy definitions we can use when building our keymap and our custom function. The `GRAVE_MODS` definition will be used later in our custom function, and the following `_BL`, `_FL`, and `_CL` defines make it easier to refer to each of our layers. Note: You may also find some older keymap files may also have a define(s) for `_______` and/or `XXXXXXX`. These can be used in place for `KC_TRNS` and `KC_NO` respectively, making it easier to see what keys a layer is overriding. These definitions are now unecessary, as they are included by default. ### Layers and Keymaps The main part of this file is the `keymaps[]` definition. This is where you list your layers and the contents of those layers. This part of the file begins with this definition: const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = { After this you'll find a list of KEYMAP() macros. A KEYMAP() is simply a list of keys to define a single layer. Typically you'll have one or more "base layers" (such as QWERTY, Dvorak, or Colemak) and then you'll layer on top of that one or more "function" layers. Due to the way layers are processed you can't overlay a "lower" layer on top of a "higher" layer. `keymaps[][MATRIX_ROWS][MATRIX_COLS]` in QMK holds the 16 bit action code (sometimes referred as the quantum keycode) in it. For the keycode representing typical keys, its high byte is 0 and its low byte is the USB HID usage ID for keyboard. > TMK from which QMK was forked uses `const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS]` instead and holds the 8 bit keycode. Some keycode values are reserved to induce execution of certain action codes via the `fn_actions[]` array. #### Base Layer Here is an example of the Clueboard's base layer: /* Keymap _BL: Base Layer (Default Layer) */ [_BL] = KEYMAP( F(0), 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_GRV, KC_BSPC, KC_PGUP, \ 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_BSLS, KC_PGDN, \ KC_CAPS, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT, \ KC_LSFT, KC_NUBS, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RO, KC_RSFT, KC_UP, \ KC_LCTL, KC_LGUI, KC_LALT, KC_MHEN, KC_SPC,KC_SPC, KC_HENK, KC_RALT, KC_RCTL, MO(_FL), KC_LEFT, KC_DOWN, KC_RGHT), Some interesting things to note about this: * From a C source point of view it's only a single array, but we have embedded whitespace to more easily visualize where each key is on the physical device. * Plain keyboard scancodes are prefixed with KC_, while "special" keys are not. * The upper left key activates custom function 0 (`F(0)`)


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