[Bug] Revert Assymmetrical Split Encoder support (#12090) (#15311)

* Revert "fix broken macro in transport.h (#15239)"

This reverts commit 06f18e22d9aff0afa4dce101a6a1b2cae5511365.

* Revert "Rework encoders to enable asymmetric split keyboards (#12090)"

This reverts commit 32215d5bff52262542a2f8d2a221b0303f02c019.

1 files changed, 55 insertions, 91 deletions

diff --git a/quantum/encoder.c b/quantum/encoder.c
index 7d4e978981..8fb87281c2 100644
--- a/quantum/encoder.c
+++ b/quantum/encoder.c
@@ -16,17 +16,8 @@
  */
 
 #include "encoder.h"
-
-// this is for unit testing
-#if defined(ENCODER_MOCK_SINGLE)
-#    include "encoder/tests/mock.h"
-#elif defined(ENCODER_MOCK_SPLIT)
-#    include "encoder/tests/mock_split.h"
-#else
-#    include <gpio.h>
-#    ifdef SPLIT_KEYBOARD
-#        include "split_util.h"
-#    endif
+#ifdef SPLIT_KEYBOARD
+#    include "split_util.h"
 #endif
 
 // for memcpy
@@ -36,41 +27,17 @@
 #    define ENCODER_RESOLUTION 4
 #endif
 
-#if (!defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)) && (!defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B))
-#    error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B or ENCODERS_PAD_A_RIGHT and ENCODERS_PAD_B_RIGHT"
+#if !defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)
+#    error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B"
 #endif
 
-// on split keyboards, these are the pads and resolutions for the left half
+#define NUMBER_OF_ENCODERS (sizeof(encoders_pad_a) / sizeof(pin_t))
 static pin_t encoders_pad_a[] = ENCODERS_PAD_A;
 static pin_t encoders_pad_b[] = ENCODERS_PAD_B;
 #ifdef ENCODER_RESOLUTIONS
 static uint8_t encoder_resolutions[] = ENCODER_RESOLUTIONS;
 #endif
 
-#ifndef SPLIT_KEYBOARD
-#    define NUMBER_OF_ENCODERS (sizeof(encoders_pad_a) / sizeof(pin_t))
-#else
-// if no pads for right half are defined, we assume the keyboard is symmetric (i.e. same pads)
-#    ifndef ENCODERS_PAD_A_RIGHT
-#        define ENCODERS_PAD_A_RIGHT ENCODERS_PAD_A
-#    endif
-#    ifndef ENCODERS_PAD_B_RIGHT
-#        define ENCODERS_PAD_B_RIGHT ENCODERS_PAD_B
-#    endif
-#    if defined(ENCODER_RESOLUTIONS) && !defined(ENCODER_RESOLUTIONS_RIGHT)
-#        define ENCODER_RESOLUTIONS_RIGHT ENCODER_RESOLUTIONS
-#    endif
-
-#    define NUMBER_OF_ENCODERS ((sizeof(encoders_pad_a) + sizeof(encoders_pad_a_right)) / sizeof(pin_t))
-#    define NUMBER_OF_ENCODERS_LEFT (sizeof(encoders_pad_a) / sizeof(pin_t))
-#    define NUMBER_OF_ENCODERS_RIGHT (sizeof(encoders_pad_a_right) / sizeof(pin_t))
-static pin_t   encoders_pad_a_right[]      = ENCODERS_PAD_A_RIGHT;
-static pin_t   encoders_pad_b_right[]      = ENCODERS_PAD_B_RIGHT;
-#    ifdef ENCODER_RESOLUTIONS_RIGHT
-static uint8_t encoder_resolutions_right[] = ENCODER_RESOLUTIONS_RIGHT;
-#    endif
-#endif
-
 #ifndef ENCODER_DIRECTION_FLIP
 #    define ENCODER_CLOCKWISE true
 #    define ENCODER_COUNTER_CLOCKWISE false
@@ -83,81 +50,78 @@ static int8_t encoder_LUT[] = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1,
 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 uint8_t encoder_value[NUMBER_OF_ENCODERS * 2] = {0};
+// row offsets for each hand
+static uint8_t thisHand, thatHand;
+#else
 static uint8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
+#endif
 
 __attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) { return true; }
 
 __attribute__((weak)) bool encoder_update_kb(uint8_t index, bool clockwise) { return encoder_update_user(index, clockwise); }
 
-// number of encoders connected to this controller
-static uint8_t numEncodersHere;
-// index of the first encoder connected to this controller (only for right halves, this will be nonzero)
-static uint8_t firstEncoderHere;
-#ifdef SPLIT_KEYBOARD
-// index of the first encoder connected to the other half
-static uint8_t firstEncoderThere;
-#endif
-// the pads for this controller
-static pin_t* pad_a;
-static pin_t* pad_b;
-
 void encoder_init(void) {
-#ifndef SPLIT_KEYBOARD
-    numEncodersHere  = NUMBER_OF_ENCODERS;
-    pad_a            = encoders_pad_a;
-    pad_b            = encoders_pad_b;
-    firstEncoderHere = 0;
-#else
-    if (isLeftHand) {
-        numEncodersHere   = NUMBER_OF_ENCODERS_LEFT;
-        pad_a             = encoders_pad_a;
-        pad_b             = encoders_pad_b;
-        firstEncoderHere  = 0;
-        firstEncoderThere = NUMBER_OF_ENCODERS_LEFT;
-    } else {
-        numEncodersHere   = NUMBER_OF_ENCODERS_RIGHT;
-        pad_a             = encoders_pad_a_right;
-        pad_b             = encoders_pad_b_right;
-        firstEncoderHere  = NUMBER_OF_ENCODERS_LEFT;
-        firstEncoderThere = 0;
+#if defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
+    if (!isLeftHand) {
+        const pin_t encoders_pad_a_right[] = ENCODERS_PAD_A_RIGHT;
+        const pin_t encoders_pad_b_right[] = ENCODERS_PAD_B_RIGHT;
+#    if defined(ENCODER_RESOLUTIONS_RIGHT)
+        const uint8_t encoder_resolutions_right[] = ENCODER_RESOLUTIONS_RIGHT;
+#    endif
+        for (uint8_t i = 0; i < NUMBER_OF_ENCODERS; i++) {
+            encoders_pad_a[i] = encoders_pad_a_right[i];
+            encoders_pad_b[i] = encoders_pad_b_right[i];
+#    if defined(ENCODER_RESOLUTIONS_RIGHT)
+            encoder_resolutions[i] = encoder_resolutions_right[i];
+#    endif
+        }
     }
 #endif
 
-    for (int i = 0; i < numEncodersHere; i++) {
-        setPinInputHigh(pad_a[i]);
-        setPinInputHigh(pad_b[i]);
+    for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
+        setPinInputHigh(encoders_pad_a[i]);
+        setPinInputHigh(encoders_pad_b[i]);
 
-        encoder_state[firstEncoderHere + i] = (readPin(pad_a[i]) << 0) | (readPin(pad_b[i]) << 1);
+        encoder_state[i] = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
     }
+
+#ifdef SPLIT_KEYBOARD
+    thisHand = isLeftHand ? 0 : NUMBER_OF_ENCODERS;
+    thatHand = NUMBER_OF_ENCODERS - thisHand;
+#endif
 }
 
-static bool encoder_update(int8_t index, uint8_t state) {
-    bool changed = false;
+static bool encoder_update(uint8_t index, uint8_t state) {
+    bool    changed = false;
+    uint8_t i       = index;
 
 #ifdef ENCODER_RESOLUTIONS
-#    ifndef SPLIT_KEYBOARD
-    int8_t resolution = encoder_resolutions[index];
-#    else
-    int8_t resolution = isLeftHand ? encoder_resolutions[index] : encoder_resolutions_right[index - NUMBER_OF_ENCODERS_LEFT];
-#    endif
+    uint8_t resolution = encoder_resolutions[i];
 #else
     uint8_t resolution = ENCODER_RESOLUTION;
 #endif
-    encoder_pulses[index] += encoder_LUT[state & 0xF];
-    if (encoder_pulses[index] >= resolution) {
+
+#ifdef SPLIT_KEYBOARD
+    index += thisHand;
+#endif
+    encoder_pulses[i] += encoder_LUT[state & 0xF];
+    if (encoder_pulses[i] >= resolution) {
         encoder_value[index]++;
         changed = true;
         encoder_update_kb(index, ENCODER_COUNTER_CLOCKWISE);
     }
-    if (encoder_pulses[index] <= -resolution) {  // direction is arbitrary here, but this clockwise
+    if (encoder_pulses[i] <= -resolution) {  // direction is arbitrary here, but this clockwise
         encoder_value[index]--;
         changed = true;
         encoder_update_kb(index, ENCODER_CLOCKWISE);
     }
-    encoder_pulses[index] %= resolution;
+    encoder_pulses[i] %= resolution;
 #ifdef ENCODER_DEFAULT_POS
     if ((state & 0x3) == ENCODER_DEFAULT_POS) {
-        encoder_pulses[index] = 0;
+        encoder_pulses[i] = 0;
     }
 #endif
     return changed;
@@ -165,10 +129,10 @@ static bool encoder_update(int8_t index, uint8_t state) {
 
 bool encoder_read(void) {
     bool changed = false;
-    for (uint8_t i = 0; i < numEncodersHere; i++) {
-        encoder_state[firstEncoderHere + i] <<= 2;
-        encoder_state[firstEncoderHere + i] |= (readPin(pad_a[i]) << 0) | (readPin(pad_b[i]) << 1);
-        changed |= encoder_update(firstEncoderHere + i, encoder_state[firstEncoderHere + 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);
+        changed |= encoder_update(i, encoder_state[i]);
     }
     return changed;
 }
@@ -176,12 +140,12 @@ bool encoder_read(void) {
 #ifdef SPLIT_KEYBOARD
 void last_encoder_activity_trigger(void);
 
-void encoder_state_raw(uint8_t* slave_state) { memcpy(slave_state, &encoder_value[firstEncoderHere], sizeof(uint8_t) * numEncodersHere); }
+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) {
     bool changed = false;
-    for (uint8_t i = 0; i < NUMBER_OF_ENCODERS - numEncodersHere; i++) {
-        uint8_t index = firstEncoderThere + 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--;