Updated slave encoder sync to reduce dropped pulses - v2 (#7505)

* Updated slave encoder sync to reduce dropped pulses

* Fixing encoder direction

* Encoder behavior fixes, tested

* Update keyboards/rgbkb/sol/keymaps/xulkal/rules.mk

To make fauxpark happy

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Update custom_encoder.c

* Update rules.mk

* Iris r4 fix

* More fixes for Iris & Kira

* Fix for right master encoders

1 files changed, 30 insertions, 16 deletions

diff --git a/quantum/encoder.c b/quantum/encoder.c
index 36a6403b36..c41b89f495 100644
--- a/quantum/encoder.c
+++ b/quantum/encoder.c
@@ -38,14 +38,15 @@ static pin_t encoders_pad_b[] = ENCODERS_PAD_B;
 static int8_t encoder_LUT[] = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0};
 
 static uint8_t encoder_state[NUMBER_OF_ENCODERS] = {0};
+static int8_t encoder_pulses[NUMBER_OF_ENCODERS] = {0};
 
 #ifdef SPLIT_KEYBOARD
 // right half encoders come over as second set of encoders
-static int8_t encoder_value[NUMBER_OF_ENCODERS * 2] = {0};
+static uint8_t encoder_value[NUMBER_OF_ENCODERS * 2] = {0};
 // row offsets for each hand
 static uint8_t thisHand, thatHand;
 #else
-static int8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
+static uint8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
 #endif
 
 __attribute__((weak)) void encoder_update_user(int8_t index, bool clockwise) {}
@@ -78,34 +79,47 @@ void encoder_init(void) {
 }
 
 static void encoder_update(int8_t index, uint8_t state) {
-    encoder_value[index] += encoder_LUT[state & 0xF];
-    if (encoder_value[index] >= ENCODER_RESOLUTION) {
-        encoder_update_kb(index, false);
-    }
-    if (encoder_value[index] <= -ENCODER_RESOLUTION) { // direction is arbitrary here, but this clockwise
+    uint8_t i = index;
+#ifdef SPLIT_KEYBOARD
+    index += thisHand;
+#endif
+    encoder_pulses[i] += encoder_LUT[state & 0xF];
+    if (encoder_pulses[i] >= ENCODER_RESOLUTION) {
+        encoder_value[index]++;
         encoder_update_kb(index, true);
     }
-    encoder_value[index] %= ENCODER_RESOLUTION;
+    if (encoder_pulses[i] <= -ENCODER_RESOLUTION) { // direction is arbitrary here, but this clockwise
+        encoder_value[index]--;
+        encoder_update_kb(index, false);
+    }
+    encoder_pulses[i] %= ENCODER_RESOLUTION;
 }
 
 void encoder_read(void) {
-    for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
+    for (uint8_t i = 0; i < NUMBER_OF_ENCODERS; i++) {
         encoder_state[i] <<= 2;
         encoder_state[i] |= (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
-#if SPLIT_KEYBOARD
-        encoder_update(i + thisHand, encoder_state[i]);
-#else
         encoder_update(i, encoder_state[i]);
-#endif
     }
 }
 
 #ifdef SPLIT_KEYBOARD
-void encoder_state_raw(uint8_t* slave_state) { memcpy(slave_state, encoder_state, sizeof(encoder_state)); }
+void encoder_state_raw(uint8_t* slave_state) { memcpy(slave_state, &encoder_value[thisHand], sizeof(uint8_t) * NUMBER_OF_ENCODERS); }
 
 void encoder_update_raw(uint8_t* slave_state) {
-    for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
-        encoder_update(i + thatHand, slave_state[i]);
+    for (uint8_t i = 0; i < NUMBER_OF_ENCODERS; i++) {
+        uint8_t index = i + thatHand;
+        int8_t delta = slave_state[i] - encoder_value[index];
+        while (delta > 0) {
+            delta--;
+            encoder_value[index]++;
+            encoder_update_kb(index, true);
+        }
+        while (delta < 0) {
+            delta++;
+            encoder_value[index]--;
+            encoder_update_kb(index, false);
+        }
     }
 }
 #endif