Supports Unicode up to 0xFFFFFFFF. You need to maintain a separate mapping table `const uint32_t PROGMEM unicode_map[] = {...}` in your keymap file. The keycode function is `X(n)` where *n* is the array index of the mapping table.
And you may want to have an enum to make reference easier. So you'd want to add something like this to your keymap:
Supports Unicode up to 0xFFFFFFFF. As with `UNICODE_MAP`, you may want to main a mapping table in your keymap file. However, there is no keycodes for this feature, you will have to add a keycode or function to call `qk_ucis_start()`. Once you've run that, you can just type the text for your unicode, and then hit space or enter to complete it, or ESC to cancel it. And if it matches an entry in your table, it will automatically "backspace" the trigger word (from your table) and then will input the unicode sequence.
For instance, you would need to have a table like this in your keymap:
You run the function, and then type "rofl" and hit enter, it should backspace remove "rofl" and input the `0x1f923` unicode.
### Customization
There are several functions that you can add to your keymap to customize the functionality of this feature.
*`void qk_ucis_start_user(void)` - This runs when you run the "start" function, and can be used to provide feedback. By default, it types out a keyboard emoji.
*`void qk_ucis_success(uint8_t symbol_index)` - This runs when the unicode input has matched something, and has completed. Default doesn't do anything.
*`void qk_ucis_symbol_fallback (void)` - This runs if the input text doesn't match anything. The default function falls back to trying that input as a unicode code.
* __UC_OSX__: MacOS Unicode Hex Input support. Works only up to 0xFFFF. Disabled by default. To enable: go to System Preferences -> Keyboard -> Input Sources, and enable Unicode Hex.
* __UC_OSX_RALT__: Same as UC_OSX, but sends the Right Alt key for unicode input
* __UC_LNX__: Unicode input method under Linux. Works up to 0xFFFFF. Should work almost anywhere on ibus enabled distros. Without ibus, this works under GTK apps, but rarely anywhere else.
* __UC_WIN__: (not recommended) Windows built-in Unicode input. To enable: create registry key under `HKEY_CURRENT_USER\Control Panel\Input Method\EnableHexNumpad` of type `REG_SZ` called `EnableHexNumpad`, set its value to 1, and reboot. This method is not recommended because of reliability and compatibility issue, use WinCompose method below instead.
* __UC_WINC__: Windows Unicode input using WinCompose. Requires [WinCompose](https://github.com/samhocevar/wincompose). Works reliably under many (all?) variations of Windows.
If you have the [Audio feature](feature_audio.md) enabled on the board, you can set "songs" for them to play when pressed, so you have some audio feedback when switching modes.
For instance, you can add these to your `config.h` file.
The "start" and "finish" functions for unicode method can be customized locally. A great use for this is to customize the input methods if you don't use the default keys. Or to add visual, or audio feedback when inputting unicode characters.
*`void unicode_input_start(void)` - This is called to start the sequence to input unicode characters. It handles calling RAlt or whatever ever sequence you want.
*`void unicode_input_finish (void)` - This is called to cleanup things, such as releasing the RAlt key in some cases, or tapping a key to finish the sequence.
You can find the default functions in [`process_unicode_common.c`](https://github.com/qmk/qmk_firmware/blob/master/quantum/process_keycode/process_unicode_common.c).
To type multiple characters for things like (ノಠ痊ಠ)ノ彡┻━┻, you can use `send_unicode_hex_string()` much like `SEND_STRING()` except you would use hex values separate by spaces.
For example, the table flip seen above would be `send_unicode_hex_string("0028 30CE 0CA0 75CA 0CA0 0029 30CE 5F61 253B 2501 253B")`
There are many ways to get a hex code, but an easy one is [this site](https://r12a.github.io/app-conversion/). Just make sure to convert to hexadecimal, and that is your string.
In `quantum/keymap_extras/`, you'll see various language files - these work the same way as the alternative layout ones do. Most are defined by their two letter country/language code followed by an underscore and a 4-letter abbreviation of its name. `FR_UGRV` which will result in a `ù` when using a software-implemented AZERTY layout. It's currently difficult to send such characters in just the firmware.
The method does not require Unicode support in the keyboard itself but depends instead of [AutoHotkey](https://autohotkey.com) running in the background.
