mirror of
https://github.com/qmk/qmk_firmware.git
synced 2024-12-16 06:33:23 +00:00
c347e732be
* `EEP_RST` -> `EE_CLR`, default-ish keymaps * `EEP_RST` -> `EE_CLR`, user keymaps * `EEP_RST` -> `EE_CLR`, community layouts * `EEP_RST` -> `EE_CLR`, userspace * `EEP_RST` -> `EE_CLR`, docs & core
124 lines
5.5 KiB
Markdown
124 lines
5.5 KiB
Markdown
# List of Useful Core Functions To Make Your Keyboard Better
|
||
|
||
There are a lot of hidden functions in QMK that are incredibly useful, or may add a bit of functionality that you've been wanting. Functions that are specific to certain features are not included here, as those will be on their respective feature page.
|
||
|
||
## (OLKB) Tri Layers :id=olkb-tri-layers
|
||
|
||
There are actually separate functions that you can use there, depending on what you're after.
|
||
|
||
### `update_tri_layer(x, y, z)`
|
||
|
||
The first is the `update_tri_layer(x, y, z)` function. This function check to see if layers `x` and `y` are both on. If they are both on, then it turns on layer `z`. Otherwise, if both `x` and `y` are not both on (either only one is, or neither is), then it turns off layer `z`.
|
||
|
||
This function is useful if you want to create specific keys that have this functionality, but other layer keycodes won't do this.
|
||
|
||
#### Example
|
||
|
||
```c
|
||
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
|
||
switch (keycode) {
|
||
case LOWER:
|
||
if (record->event.pressed) {
|
||
layer_on(_LOWER);
|
||
update_tri_layer(_LOWER, _RAISE, _ADJUST);
|
||
} else {
|
||
layer_off(_LOWER);
|
||
update_tri_layer(_LOWER, _RAISE, _ADJUST);
|
||
}
|
||
return false;
|
||
case RAISE:
|
||
if (record->event.pressed) {
|
||
layer_on(_RAISE);
|
||
update_tri_layer(_LOWER, _RAISE, _ADJUST);
|
||
} else {
|
||
layer_off(_RAISE);
|
||
update_tri_layer(_LOWER, _RAISE, _ADJUST);
|
||
}
|
||
return false;
|
||
}
|
||
return true;
|
||
}
|
||
```
|
||
|
||
### `update_tri_layer_state(state, x, y, z)`
|
||
The other function is `update_tri_layer_state(state, x, y, z)`. This function is meant to be called from the [`layer_state_set_*` functions](custom_quantum_functions.md#layer-change-code). This means that any time that you use a keycode to change the layer, this will be checked. So you could use `LT(layer, kc)` to change the layer and it will trigger the same layer check.
|
||
|
||
There are a couple of caveats to this method:
|
||
1. You cannot access the `z` layer without having `x` and `y` layers on, since if you try to activate just layer `z`, it will run this code and turn off layer `z` before you could use it.
|
||
2. Because layers are processed from the highest number `z` should be a higher layer than `x` and `y` or you may not be able to access it.
|
||
|
||
#### Example
|
||
|
||
```c
|
||
layer_state_t layer_state_set_user(layer_state_t state) {
|
||
return update_tri_layer_state(state, _LOWER, _RAISE, _ADJUST);
|
||
}
|
||
```
|
||
|
||
Alternatively, you don't have to immediately "return" the value. This is useful if you want to add multiple tri layers, or if you want to add additional effects.
|
||
|
||
```c
|
||
layer_state_t layer_state_set_user(layer_state_t state) {
|
||
state = update_tri_layer_state(state, _LOWER, _RAISE, _ADJUST);
|
||
state = update_tri_layer_state(state, _RAISE, _SYMB, _SPECIAL);
|
||
return state;
|
||
}
|
||
```
|
||
|
||
## Setting the Persistent Default Layer
|
||
|
||
Do you want to set the default layer, so that it's retained even after you unplug the board? If so, this is the function for you.
|
||
|
||
To use this, you would use `set_single_persistent_default_layer(layer)`. If you have a name defined for your layer, you can use that instead (such as _QWERTY, _DVORAK or _COLEMAK).
|
||
|
||
This will set the default layer, update the persistent settings, and play a tune if you have [Audio](feature_audio.md) enabled on your board, and the default layer sounds set.
|
||
|
||
To configure the default layer sounds, you would want to define this in your `config.h` file, like this:
|
||
|
||
```c
|
||
#define DEFAULT_LAYER_SONGS { SONG(QWERTY_SOUND), \
|
||
SONG(COLEMAK_SOUND), \
|
||
SONG(DVORAK_SOUND) \
|
||
}
|
||
```
|
||
|
||
|
||
?> There are a large number of predefined songs in [quantum/audio/song_list.h](https://github.com/qmk/qmk_firmware/blob/master/quantum/audio/song_list.h) that you can use.
|
||
|
||
## Resetting the keyboard
|
||
|
||
There is the `QK_REBOOT` or `QK_RBT` quantum keycode that you can use. But if you want to reset the board as part of a macro, rather than hitting a key separately, you can do that.
|
||
|
||
And to do so, add `soft_reset_keyboard()` to your function or macro.
|
||
|
||
## Reset to bootloader
|
||
|
||
To reset to the bootloader use `QK_BOOTLOADER` or `QK_BOOT` keycode or `reset_keyboard()` function.
|
||
|
||
## Wiping the EEPROM (Persistent Storage)
|
||
|
||
If you're having issues with Audio, RGB Underglow, backlighting or keys acting weird, then you can reset the EEPROM (persistent setting storage). To force an EEPROM reset, use the [`EE_CLR` keycode](quantum_keycodes.md) or [Bootmagic Lite](feature_bootmagic.md) functionality. If neither of those are an option, then you can use a custom macro to do so.
|
||
|
||
To wipe the EEPROM, run `eeconfig_init()` from your function or macro to reset most of the settings to default.
|
||
|
||
## Tap random key
|
||
|
||
If you want to send a random character to the host computer, you can use the `tap_random_base64()` function. This [pseudorandomly](https://en.wikipedia.org/wiki/Pseudorandom_number_generator) selects a number between 0 and 63, and then sends a key press based on that selection. (0–25 is `A`–`Z`, 26–51 is `a`–`z`, 52–61 is `0`–`9`, 62 is `+` and 63 is `/`).
|
||
|
||
?> Needless to say, but this is _not_ a cryptographically secure method of generating random Base64 keys or passwords.
|
||
|
||
## Software Timers
|
||
|
||
It's possible to start timers and read values for time-specific events. Here's an example:
|
||
|
||
```c
|
||
static uint16_t key_timer;
|
||
key_timer = timer_read();
|
||
|
||
if (timer_elapsed(key_timer) < 100) {
|
||
// do something if less than 100ms have passed
|
||
} else {
|
||
// do something if 100ms or more have passed
|
||
}
|
||
```
|