add rotary encoder support for Quark^2 (#17470)

keyboards/checkerboards/quark_squared/config.h

@@ -53,3 +53,7 @@
 #define RGBLIGHT_HUE_STEP 12 // units to step when in/decreasing hue
 #define RGBLIGHT_SAT_STEP 12 // units to step when in/decresing saturation
 #define RGBLIGHT_VAL_STEP 12 // units to step when in/decreasing value (brightness)
+
+/* define rotary encoder pins */
+#define ENCODERS_PAD_A {B0}
+#define ENCODERS_PAD_B {D1}

keyboards/checkerboards/quark_squared/quark_squared.c

@@ -15,3 +15,15 @@
  */
 
 #include "quark_squared.h"
+
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    if (!encoder_update_user(index, clockwise)) { return false; }
+    if (index == 0) {
+        if (clockwise) {
+            tap_code_delay(KC_VOLD, 10);
+        } else {
+            tap_code_delay(KC_VOLU, 10);
+        }
+    }
+    return true;
+}

keyboards/checkerboards/quark_squared/rules.mk

@@ -17,7 +17,7 @@ BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
 RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
 AUDIO_ENABLE = no           # Audio output
 UNICODE_ENABLE = yes        # Unicode
-
+ENCODER_ENABLE = yes 		# Enable Rotary Encoders
 # Disable unsupported hardware
 AUDIO_SUPPORTED = no
 BACKLIGHT_SUPPORTED = no