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Updated FAQ Keymap (markdown)

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tmk 2015-12-09 12:03:07 +09:00
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FAQ-Keymap.md
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@ -222,3 +222,28 @@ Dual-role key: https://en.wikipedia.org/wiki/Modifier_key#Dual-role_keys
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_keyboard/blob/master/tmk_core/common/action_util.c#L57