<p>This page covers questions people often have about keymaps. If you haven't you should read <ahref="../Reference/Keymap_Overview.html">Keymap Overview</a> first.</p>
<h2id="page_What-Keycodes-Can-I-Use">What Keycodes Can I Use?</h2>
<p>See <ahref="../Keycodes/index.html">Keycodes</a> for an index of keycodes available to you. These link to more extensive documentation when available.</p>
<p>Keycodes are actually defined in <ahref="https://github.com/qmk/qmk_firmware/blob/master/tmk_core/common/keycode.h"class="Link--external">common/keycode.h</a>.</p>
<h2id="page_What-Are-the-Default-Keycodes">What Are the Default Keycodes?</h2>
<p>There are 3 standard keyboard layouts in use around the world- ANSI, ISO, and JIS. North America primarily uses ANSI, Europe and Africa primarily use ISO, and Japan uses JIS. Regions not mentioned typically use either ANSI or ISO. The keycodes corresponding to these layouts are shown here:</p>
<!-- Source for this image: http://www.keyboard-layout-editor.com/#/gists/9ce023dc6caadc0cf11c88c782350a8c -->
<h2id="page_Some-Of-My-Keys-Are-Swapped-Or-Not-Working">Some Of My Keys Are Swapped Or Not Working</h2>
<p>QMK has two features, Bootmagic and Command, which allow you to change the behavior of your keyboard on the fly. This includes, but is not limited to, swapping Ctrl/Caps, disabling Gui, swapping Alt/Gui, swapping Backspace/Backslash, disabling all keys, and other behavioral modifications.</p>
<p>As a quick fix try holding down <code>Space</code>+<code>Backspace</code> while you plug in your keyboard. This will reset the stored settings on your keyboard, returning those keys to normal operation. If that doesn't work look here:</p>
<ul>
<li>
<ahref="../Features/Bootmagic.html">Bootmagic</a>
</li>
<li>
<ahref="../Features/Command.html">Command</a>
</li>
</ul>
<h2id="page_The-Menu-Key-Isn-t-Working">The Menu Key Isn't Working</h2>
<p>The key found on most modern keyboards that is located between <code>KC_RGUI</code> and <code>KC_RCTL</code> is actually called <code>KC_APP</code>. This is because when that key was invented there was already a key named <code>MENU</code> in the relevant standards, so MS chose to call that the <code>APP</code> key.</p>
<p>Use keycode for Print Screen(<code>KC_PSCREEN</code> or <code>KC_PSCR</code>) instead of <code>KC_SYSREQ</code>. Key combination of 'Alt + Print Screen' is recognized as 'System request'.</p>
<p>Modifier keys or layers can be stuck unless layer switching is configured properly.
For Modifier keys and layer actions you have to place <code>KC_TRANS</code> on same position of destination layer to unregister the modifier key or return to previous layer on release event.</p>
<p>This feature is for <em>mechanical lock switch</em> like <ahref="http://deskthority.net/wiki/Alps_SKCL_Lock"class="Link--external">this Alps one</a>. You can enable it by adding this to your <code>config.h</code>:</p>
<pre><code>#define LOCKING_SUPPORT_ENABLE
#define LOCKING_RESYNC_ENABLE
</code></pre>
<p>After enabling this feature use keycodes <code>KC_LCAP</code>, <code>KC_LNUM</code> and <code>KC_LSCR</code> in your keymap instead.</p>
<p>Old vintage mechanical keyboards occasionally have lock switches but modern ones don't have. <em><strong>You don't need this feature in most case and just use keycodes <code>KC_CAPS</code>, <code>KC_NLCK</code> and <code>KC_SLCK</code>.</strong></em></p>
<h2id="page_Input-Special-Characters-Other-Than-ASCII-like-Cedille-C">Input Special Characters Other Than ASCII like Cédille 'Ç'</h2>
<p>NO UNIVERSAL METHOD TO INPUT THOSE WORKS OVER ALL SYSTEMS. You have to define <strong>MACRO</strong> in way specific to your OS or layout.</p>
<p>See this post for example <strong>MACRO</strong> code.</p>
<p>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.</p>
<h2id="page_Media-Control-Keys-in-Mac-OSX">Media Control Keys in Mac OSX</h2>
<h4id="page_KC-_-MNXT-and-KC-_-MPRV-Does-Not-Work-on-Mac">KC_MNXT and KC_MPRV Does Not Work on Mac</h4>
<p>Use <code>KC_MFFD</code>(<code>KC_MEDIA_FAST_FORWARD</code>) and <code>KC_MRWD</code>(<code>KC_MEDIA_REWIND</code>) instead of <code>KC_MNXT</code> and <code>KC_MPRV</code>.
See https://github.com/tmk/tmk_keyboard/issues/195</p>
<h2id="page_Keys-Supported-in-Mac-OSX">Keys Supported in Mac OSX?</h2>
<p>You can know which keycodes are supported in OSX from this source code.</p>
<h2id="page_JIS-Keys-in-Mac-OSX">JIS Keys in Mac OSX</h2>
<p>Japanese JIS keyboard specific keys like <code>無変換(Muhenkan)</code>, <code>変換(Henkan)</code>, <code>ひらがな(hiragana)</code> are not recognized on OSX. You can use <strong>Seil</strong> to enable those keys, try following options.</p>
<ul>
<li>Enable NFER Key on PC keyboard</li>
<li>Enable XFER Key on PC keyboard</li>
<li>Enable KATAKANA Key on PC keyboard</li>
</ul>
<p>https://pqrs.org/osx/karabiner/seil.html</p>
<h2id="page_RN-42-Bluetooth-Doesn-t-Work-with-Karabiner">RN-42 Bluetooth Doesn't Work with Karabiner</h2>
<p>Karabiner - Keymapping tool on Mac OSX - ignores inputs from RN-42 module by default. You have to enable this option to make Karabiner working with your keyboard.
<h2id="page_Esc-and-on-a-Single-Key">Esc and <code>`</code> on a Single Key</h2>
<p>See the <ahref="../Features/Grave_Escape.html">Grave Escape</a> feature.</p>
<h2id="page_Arrow-on-Right-Modifier-Keys-with-Dual-Role">Arrow on Right Modifier Keys with Dual-Role</h2>
<p>This turns right modifier 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 <strong>TAP</strong>.</p>
<pre><code>
#include "keymap_common.h"
/* Arrow keys on right modifier keys with TMK dual role feature
<h2id="page_Eject-on-Mac-OSX">Eject on Mac OSX</h2>
<p><code>KC_EJCT</code> 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.</p>
<p>Not sure what keycode Eject is on genuine Apple keyboard actually. HHKB uses <code>F20</code> for Eject key(<code>Fn+f</code>) on Mac mode but this is not same as Apple Eject keycode probably.</p>
<h2id="page_What-s-and-in">What's <code>weak_mods</code> and <code>real_mods</code> in <code>action_util.c</code></h2>
<p><em><strong>TO BE IMPROVED</strong></em></p>
<p>real_mods is intended to retains state of real/physical modifier key state, while
weak_mods retains state of virtual or temporary modifiers which should not affect state real modifier key.</p>
<p>Let's say you hold down physical left shift key and type ACTION_MODS_KEY(LSHIFT, KC_A),</p>
<p>with weak_mods,</p>
<ul>
<li>(1) hold down left shift: real_mods |= MOD_BIT(LSHIFT)</li>
