## READ FIRST
-https://github.com/tmk/tmk_keyboard/blob/master/doc/keymap.md
+https://github.com/tmk/tmk_core/blob/master/doc/keymap.md
## How to get keycode
-See [doc/keycode.txt](https://github.com/tmk/tmk_keyboard/blob/master/doc/keycode.txt).
-Keycodes are actually defined in [common/keycode.h](https://github.com/tmk/tmk_keyboard/blob/master/common/keycode.h).
+See [doc/keycode.txt](https://github.com/tmk/tmk_core/blob/master/doc/keycode.txt).
+Keycodes are actually defined in [common/keycode.h](https://github.com/tmk/tmk_core/blob/master/common/keycode.h).
## Sysrq key
Use keycode for Print Screen(`KC_PSCREEN` or `KC_PSCR`) instead of `KC_SYSREQ`. Key combination of 'Alt + Print Screen' is recognized as 'System request'.
Modifier keys or layers can be stuck unless layer switching is configured properly.
For Modifier keys and layer actions you have to place `KC_TRANS` on same position of destination layer to unregister the modifier key or return to previous layer on release event.
-- https://github.com/tmk/tmk_keyboard/blob/master/doc/keymap.md#31-momentary-switching
+- https://github.com/tmk/tmk_core/blob/master/doc/keymap.md#31-momentary-switching
- http://geekhack.org/index.php?topic=57008.msg1492604#msg1492604
- https://github.com/tmk/tmk_keyboard/issues/248
- http://en.wikipedia.org/wiki/Unicode_input
-### Apple keyboard Fn
+## Apple/Mac keyboard Fn
Not supported.
-Apple keyboard sends keycode for Fn unlike most of other keyboards.
-I think you can send Apple Fn key using Apple venter specific Page 0xff00 and usage 0x0003. But you have to change HID Report Descriptor for this, of course.
+Apple/Mac keyboard sends keycode for Fn unlike most of other keyboards.
+I think you can send Apple Fn key using Apple venter specific Page 0xff01 and usage 0x0003. But you have to change HID Report Descriptor for this, of course.
https://opensource.apple.com/source/IOHIDFamily/IOHIDFamily-606.1.7/IOHIDFamily/AppleHIDUsageTables.h
You can define FC660 and Poker style ESC with `ACTION_LAYER_MODS`.
-https://github.com/tmk/tmk_keyboard/blob/master/doc/keymap.md#35-momentary-switching-with-modifiers
+https://github.com/tmk/tmk_core/blob/master/doc/keymap.md#35-momentary-switching-with-modifiers
```
#include "keymap_common.h"
};
const uint16_t PROGMEM fn_actions[] = {
- // https://github.com/tmk/tmk_keyboard/blob/master/doc/keymap.md#35-momentary-switching-with-modifiers
+ // https://github.com/tmk/tmk_core/blob/master/doc/keymap.md#35-momentary-switching-with-modifiers
[0] = ACTION_LAYER_MODS(1, MOD_LSFT),
[1] = ACTION_LAYER_MOMENTARY(2),
};
https://github.com/tmk/tmk_keyboard/issues?utf8=%E2%9C%93&q=is%3Aissue+actionmap
### extension for modified keys
-https://geekhack.org/index.php?topic=41989.msg1885526#msg1885526
\ No newline at end of file
+https://geekhack.org/index.php?topic=41989.msg1885526#msg1885526
+
+
+## Arrow on Right Modifier keys with Dual-Role
+This turns right modifer keys into arrow keys when the keys are tapped while still modifiers when the keys are hold. In TMK the dual-role function is dubbed **TAP**.
+```
+#include "keymap_common.h"
+
+
+/* Arrow keys on right modifier keys with TMK dual role feature
+ *
+ * https://github.com/tmk/tmk_core/blob/master/doc/keymap.md#213-modifier-with-tap-keydual-role
+ * https://en.wikipedia.org/wiki/Modifier_key#Dual-role_keys
+ */
+const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ /* 0: qwerty */
+ [0] = KEYMAP( \
+ ESC, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, MINS,EQL, NUHS,BSPC, \
+ TAB, Q, W, E, R, T, Y, U, I, O, P, LBRC,RBRC,BSLS, \
+ LCTL,A, S, D, F, G, H, J, K, L, SCLN,QUOT,ENT, \
+ LSFT,NUBS,Z, X, C, V, B, N, M, COMM,DOT, SLSH,FN0, ESC, \
+ FN4, LGUI,LALT, SPC, APP, FN2, FN1, FN3),
+ [1] = KEYMAP( \
+ GRV, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, TRNS,TRNS, \
+ TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,\
+ TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS, \
+ TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,FN5, TRNS, \
+ TRNS,TRNS,TRNS, TRNS, TRNS,FN7, FN6, FN8),
+};
+
+const uint16_t PROGMEM fn_actions[] = {
+ [0] = ACTION_MODS_TAP_KEY(MOD_RSFT, KC_UP),
+ [1] = ACTION_MODS_TAP_KEY(MOD_RGUI, KC_DOWN),
+ [2] = ACTION_MODS_TAP_KEY(MOD_RALT, KC_LEFT),
+ [3] = ACTION_MODS_TAP_KEY(MOD_RCTL, KC_RIGHT),
+ [4] = ACTION_LAYER_MOMENTARY(1),
+ [5] = ACTION_MODS_TAP_KEY(MOD_RSFT, KC_PGUP),
+ [6] = ACTION_MODS_TAP_KEY(MOD_RGUI, KC_PGDN),
+ [7] = ACTION_MODS_TAP_KEY(MOD_RALT, KC_HOME),
+ [8] = ACTION_MODS_TAP_KEY(MOD_RCTL, KC_END),
+};
+
+```
+
+
+Dual-role key: https://en.wikipedia.org/wiki/Modifier_key#Dual-role_keys
+
+
+## Eject on Mac OSX
+`EJCT` keycode works on OSX. https://github.com/tmk/tmk_keyboard/issues/250
+It seems Windows 10 ignores the code and Linux/Xorg recognizes but has no mapping by default.
+
+Not sure what keycode Eject is on genuine Apple keyboard actually. HHKB uses `F20` for Eject key(`Fn+f`) on Mac mode but this is not same as Apple Eject keycode probably.
+
+
+
+## What's weak_mods and real_mods in action_util.c
+___TO BE IMPROVED___
+
+real_mods is intended to retains state of real/physical modifier key state, while
+weak_mods retains state of virtual or temprary modifiers which should not affect state real modifier key.
+
+Let's say you hold down physical left shift key and type ACTION_MODS_KEY(LSHIFT, KC_A),
+
+with weak_mods,
+* (1) hold down left shift: real_mods |= MOD_BIT(LSHIFT)
+* (2) press ACTION_MODS_KEY(LSHIFT, KC_A): weak_mods |= MOD_BIT(LSHIFT)
+* (3) release ACTION_MODS_KEY(LSHIFT, KC_A): waek_mods &= ~MOD_BIT(LSHIFT)
+real_mods still keeps modifier state.
+
+without weak mods,
+* (1) hold down left shift: real_mods |= MOD_BIT(LSHIFT)
+* (2) press ACTION_MODS_KEY(LSHIFT, KC_A): real_mods |= MOD_BIT(LSHIFT)
+* (3) release ACTION_MODS_KEY(LSHIFT, KC_A): real_mods &= ~MOD_BIT(LSHIFT)
+here real_mods lost state for 'physical left shift'.
+
+weak_mods is ORed with real_mods when keyboard report is sent.
+https://github.com/tmk/tmk_core/blob/master/common/action_util.c#L57