add support for encoders to core

docs/_sidebar.md

@@ -52,6 +52,7 @@
   * [Combos](feature_combo)
   * [Command](feature_command.md)
   * [Dynamic Macros](feature_dynamic_macros.md)
+  * [Encoders](feature_encoders.md)
   * [Grave Escape](feature_grave_esc.md)
   * [Key Lock](feature_key_lock.md)
   * [Layouts](feature_layouts.md)

docs/_summary.md

@@ -52,6 +52,7 @@
   * [Combos](feature_combo)
   * [Command](feature_command.md)
   * [Dynamic Macros](feature_dynamic_macros.md)
+  * [Encoders](feature_encoders.md)
   * [Grave Escape](feature_grave_esc.md)
   * [Key Lock](feature_key_lock.md)
   * [Layouts](feature_layouts.md)

docs/feature_encoders.md

@@ -0,0 +1,41 @@
+# Encoders
+
+Basic encoders are supported by adding this to your `rules.mk`:
+
+    ENCODER_ENABLE = yes
+
+and this to your `config.h`:
+
+    #define NUMBER_OF_ENCODERS 1
+    #define ENCODERS_PAD_A { B12 }
+    #define ENCODERS_PAD_B { B13 }
+
+Each PAD_A/B variable defines an array so multiple encoders can be defined, e.g.:
+
+    #define ENCODERS_PAD_A { encoder1a, encoder2a }
+    #define ENCODERS_PAD_B { encoder1a, encoder2b }
+
+If your encoder's clockwise directions are incorrect, you can swap the A & B pad definitions.
+
+Additionally, the resolution can be specified in the same file (the default & suggested is 4):
+
+    #define ENCODER_RESOLUTION 4
+
+## Callbacks
+
+The callback functions can be inserted into your `<keyboard>.c`:
+
+    void encoder_update_kb(uint8_t index, bool clockwise) {
+        encoder_update_user(index, clockwise);
+    }
+
+or `keymap.c`:
+
+    void encoder_update_user(uint8_t index, bool clockwise) {
+        
+    }
+
+
+## Hardware
+
+The A an B lines of the encoders should be wired directly to the MCU, and the C/common lines should be wired to ground.