X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=docs%2Fcustom_quantum_functions.md;h=6d741b6cb251120c9054dfdca39c35a7e17e21b1;hb=4d26137e2a46255912fb841384bf669ede865f25;hp=928dccc9c349717a120e4a534ceeefee77bb4c06;hpb=bb53635f33c213e5a940edea8b07026ef89aed42;p=qmk_firmware.git

diff --git a/docs/custom_quantum_functions.md b/docs/custom_quantum_functions.md
index 928dccc9c..6d741b6cb 100644
--- a/docs/custom_quantum_functions.md
+++ b/docs/custom_quantum_functions.md
@@ -36,7 +36,7 @@ enum my_keycodes {
 
 ## Programming the Behavior of Any Keycode
 
-When you want to override the behavior of an existing key, or define the behavior for a new key, you should use the `process_record_kb()` and `process_record_user()` functions. These are called by QMK during key processing before the actual key event is handled. If these functions return `true` QMK will process the keycodes as usual. That can be handy for extending the functionality of a key rather than replacing it. If these functions return `false` QMK will skip the normal key handling, and it will be up you to send any key up or down events that are required.
+When you want to override the behavior of an existing key, or define the behavior for a new key, you should use the `process_record_kb()` and `process_record_user()` functions. These are called by QMK during key processing before the actual key event is handled. If these functions return `true` QMK will process the keycodes as usual. That can be handy for extending the functionality of a key rather than replacing it. If these functions return `false` QMK will skip the normal key handling, and it will be up to you to send any key up or down events that are required.
 
 These function are called every time a key is pressed or released.
 
@@ -60,6 +60,8 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
         PLAY_NOTE_ARRAY(tone_qwerty);
       }
       return true; // Let QMK send the enter press/release events
+    default:
+      return true; // Process all other keycodes normally
   }
 }
 ```
@@ -96,10 +98,10 @@ This allows you to control the 5 LED's defined as part of the USB Keyboard spec.
 * `USB_LED_COMPOSE`
 * `USB_LED_KANA`
 
-### Example `led_set_kb()` Implementation
+### Example `led_set_user()` Implementation
 
 ```
-void led_set_kb(uint8_t usb_led) {
+void led_set_user(uint8_t usb_led) {
     if (usb_led & (1<<USB_LED_NUM_LOCK)) {
         PORTB |= (1<<0);
     } else {
@@ -137,14 +139,13 @@ void led_set_kb(uint8_t usb_led) {
 
 Before a keyboard can be used the hardware must be initialized. QMK handles initialization of the keyboard matrix itself, but if you have other hardware like LED's or i&#xb2;c controllers you will need to set up that hardware before it can be used.
 
-### Example `matrix_init_kb()` Implementation
+### Example `matrix_init_user()` Implementation
 
 This example, at the keyboard level, sets up B1, B2, and B3 as LED pins.
 
 ```
-void matrix_init_kb(void) {
+void matrix_init_user(void) {
   // Call the keymap level matrix init.
-  matrix_init_user();
 
   // Set our LED pins as output
   DDRB |= (1<<1);
@@ -174,3 +175,41 @@ This example has been deliberately omitted. You should understand enough about Q
 This function gets called at every matrix scan, which is basically as often as the MCU can handle. Be careful what you put here, as it will get run a lot.
 
 You should use this function if you need custom matrix scanning code. It can also be used for custom status output (such as LED's or a display) or other functionality that you want to trigger regularly even when the user isn't typing.
+
+
+# Layer Change Code
+
+Thir runs code every time that the layers get changed.  This can be useful for layer indication, or custom layer handling. 
+
+### Example `layer_state_set_*` Implementation
+
+This example shows how to set the [RGB Underglow](feature_rgblight.md) lights based on the layer, using the Planck as an example
+
+```
+uint32_t layer_state_set_user(uint32_t state) {
+    switch (biton32(state)) {
+    case _RAISE:
+        rgblight_setrgb (0x00,  0x00, 0xFF);
+        break;
+    case _LOWER:
+        rgblight_setrgb (0xFF,  0x00, 0x00);
+        break;
+    case _PLOVER:
+        rgblight_setrgb (0x00,  0xFF, 0x00);
+        break;
+    case _ADJUST:
+        rgblight_setrgb (0x7A,  0x00, 0xFF);
+        break;
+    default: //  for any other layers, or the default layer
+        rgblight_setrgb (0x00,  0xFF, 0xFF);
+        break;
+    }
+  return state;
+}
+```
+### `layer_state_set_*` Function Documentation
+
+* Keyboard/Revision: `void uint32_t layer_state_set_kb(uint32_t state)`
+* Keymap: `uint32_t layer_state_set_user(uint32_t state)`
+
+The `state` is the bitmask of the active layers, as explained in the [Keymap Overview](keymap.md#keymap-layer-status)