Add encoder abstraction. (#21548)

builddefs/common_features.mk

@@ -886,9 +886,24 @@ ifeq ($(strip $(BLUETOOTH_ENABLE)), yes)
     endif
 endif
 
+ENCODER_ENABLE ?= no
+ENCODER_DRIVER ?= quadrature
+VALID_ENCODER_DRIVER_TYPES := quadrature custom
 ifeq ($(strip $(ENCODER_ENABLE)), yes)
+    ifeq ($(filter $(ENCODER_DRIVER),$(VALID_ENCODER_DRIVER_TYPES)),)
+        $(call CATASTROPHIC_ERROR,Invalid ENCODER_DRIVER,ENCODER_DRIVER="$(ENCODER_DRIVER)" is not a valid encoder driver)
+    endif
     SRC += $(QUANTUM_DIR)/encoder.c
     OPT_DEFS += -DENCODER_ENABLE
+    OPT_DEFS += -DENCODER_DRIVER_$(strip $(shell echo $(ENCODER_DRIVER) | tr '[:lower:]' '[:upper:]'))
+
+    COMMON_VPATH += $(PLATFORM_PATH)/$(PLATFORM_KEY)/$(DRIVER_DIR)/encoder
+    COMMON_VPATH += $(DRIVER_PATH)/encoder
+
+    ifneq ($(strip $(ENCODER_DRIVER)), custom)
+        SRC += encoder_$(strip $(ENCODER_DRIVER)).c
+    endif
+
     ifeq ($(strip $(ENCODER_MAP_ENABLE)), yes)
         OPT_DEFS += -DENCODER_MAP_ENABLE
     endif

data/mappings/info_rules.hjson

@@ -21,6 +21,7 @@
     "DEBOUNCE_TYPE": {"info_key": "build.debounce_type"},
     "EEPROM_DRIVER": {"info_key": "eeprom.driver"},
     "ENCODER_ENABLE": {"info_key": "encoder.enabled", "value_type": "bool"},
+    "ENCODER_DRIVER": {"info_key": "encoder.driver"},
     "FIRMWARE_FORMAT": {"info_key": "build.firmware_format"},
     "KEYBOARD_SHARED_EP": {"info_key": "usb.shared_endpoint.keyboard", "value_type": "bool"},
     "LAYOUTS": {"info_key": "community_layouts", "value_type": "list"},

data/schemas/keyboard.jsonschema

@@ -6,6 +6,10 @@
         "encoder_config": {
             "type": "object",
             "properties": {
+                "driver": {
+                    "type": "string",
+                    "enum": ["quadrature", "custom"]
+                },
                 "rotary": {
                     "type": "array",
                     "items": {

drivers/encoder/encoder_quadrature.c

@@ -0,0 +1,213 @@
+// Copyright 2018 Jack Humbert <jack.humb@gmail.com>
+// Copyright 2018-2023 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <stdint.h>
+#include "encoder.h"
+#include "gpio.h"
+#include "keyboard.h"
+#include "action.h"
+#include "keycodes.h"
+#include "wait.h"
+
+#ifdef SPLIT_KEYBOARD
+#    include "split_util.h"
+#endif
+
+// for memcpy
+#include <string.h>
+
+#if !defined(ENCODER_RESOLUTIONS) && !defined(ENCODER_RESOLUTION)
+#    define ENCODER_RESOLUTION 4
+#endif
+
+#undef ENCODER_DEFAULT_PIN_API_IMPL
+#if defined(ENCODERS_PAD_A) && defined(ENCODERS_PAD_B)
+// Inform the quadrature driver that it needs to implement pin init/read functions
+#    define ENCODER_DEFAULT_PIN_API_IMPL
+#endif
+
+extern volatile bool isLeftHand;
+
+__attribute__((weak)) void    encoder_quadrature_init_pin(uint8_t index, bool pad_b);
+__attribute__((weak)) uint8_t encoder_quadrature_read_pin(uint8_t index, bool pad_b);
+
+#ifdef ENCODER_DEFAULT_PIN_API_IMPL
+
+static pin_t encoders_pad_a[NUM_ENCODERS_MAX_PER_SIDE] = ENCODERS_PAD_A;
+static pin_t encoders_pad_b[NUM_ENCODERS_MAX_PER_SIDE] = ENCODERS_PAD_B;
+
+__attribute__((weak)) void encoder_wait_pullup_charge(void) {
+    wait_us(100);
+}
+
+__attribute__((weak)) void encoder_quadrature_init_pin(uint8_t index, bool pad_b) {
+    pin_t pin = pad_b ? encoders_pad_b[index] : encoders_pad_a[index];
+    if (pin != NO_PIN) {
+        gpio_set_pin_input_high(pin);
+    }
+}
+
+__attribute__((weak)) uint8_t encoder_quadrature_read_pin(uint8_t index, bool pad_b) {
+    pin_t pin = pad_b ? encoders_pad_b[index] : encoders_pad_a[index];
+    if (pin != NO_PIN) {
+        return gpio_read_pin(pin) ? 1 : 0;
+    }
+    return 0;
+}
+
+#endif // ENCODER_DEFAULT_PIN_API_IMPL
+
+#ifdef ENCODER_RESOLUTIONS
+static uint8_t encoder_resolutions[NUM_ENCODERS] = ENCODER_RESOLUTIONS;
+#endif
+
+#ifndef ENCODER_DIRECTION_FLIP
+#    define ENCODER_CLOCKWISE true
+#    define ENCODER_COUNTER_CLOCKWISE false
+#else
+#    define ENCODER_CLOCKWISE false
+#    define ENCODER_COUNTER_CLOCKWISE true
+#endif
+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[NUM_ENCODERS]  = {0};
+static int8_t  encoder_pulses[NUM_ENCODERS] = {0};
+
+// encoder counts
+static uint8_t thisCount;
+#ifdef SPLIT_KEYBOARD
+// encoder offsets for each hand
+static uint8_t thisHand, thatHand;
+// encoder counts for each hand
+static uint8_t thatCount;
+#endif
+
+__attribute__((weak)) void encoder_quadrature_post_init_kb(void) {
+    extern void encoder_quadrature_handle_read(uint8_t index, uint8_t pin_a_state, uint8_t pin_b_state);
+    // Unused normally, but can be used for things like setting up pin-change interrupts in keyboard code.
+    // During the interrupt, read the pins then call `encoder_handle_read()` with the pin states and it'll queue up an encoder event if needed.
+}
+
+void encoder_quadrature_post_init(void) {
+#ifdef ENCODER_DEFAULT_PIN_API_IMPL
+    for (uint8_t i = 0; i < thisCount; i++) {
+        encoder_quadrature_init_pin(i, false);
+        encoder_quadrature_init_pin(i, true);
+    }
+    encoder_wait_pullup_charge();
+    for (uint8_t i = 0; i < thisCount; i++) {
+        encoder_state[i] = (encoder_quadrature_read_pin(i, false) << 0) | (encoder_quadrature_read_pin(i, true) << 1);
+    }
+#else
+    memset(encoder_state, 0, sizeof(encoder_state));
+#endif
+
+    encoder_quadrature_post_init_kb();
+}
+
+void encoder_driver_init(void) {
+#ifdef SPLIT_KEYBOARD
+    thisHand  = isLeftHand ? 0 : NUM_ENCODERS_LEFT;
+    thatHand  = NUM_ENCODERS_LEFT - thisHand;
+    thisCount = isLeftHand ? NUM_ENCODERS_LEFT : NUM_ENCODERS_RIGHT;
+    thatCount = isLeftHand ? NUM_ENCODERS_RIGHT : NUM_ENCODERS_LEFT;
+#else // SPLIT_KEYBOARD
+    thisCount                = NUM_ENCODERS;
+#endif
+
+#ifdef ENCODER_TESTS
+    // Annoying that we have to clear out values during initialisation here, but
+    // because all the arrays are static locals, rerunning tests in the same
+    // executable doesn't reset any of these. Kinda crappy having test-only code
+    // here, but it's the simplest solution.
+    memset(encoder_state, 0, sizeof(encoder_state));
+    memset(encoder_pulses, 0, sizeof(encoder_pulses));
+    const pin_t encoders_pad_a_left[] = ENCODERS_PAD_A;
+    const pin_t encoders_pad_b_left[] = ENCODERS_PAD_B;
+    for (uint8_t i = 0; i < thisCount; i++) {
+        encoders_pad_a[i] = encoders_pad_a_left[i];
+        encoders_pad_b[i] = encoders_pad_b_left[i];
+    }
+#endif
+
+#if defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
+    // Re-initialise the pads if it's the right-hand side
+    if (!isLeftHand) {
+        const pin_t encoders_pad_a_right[] = ENCODERS_PAD_A_RIGHT;
+        const pin_t encoders_pad_b_right[] = ENCODERS_PAD_B_RIGHT;
+        for (uint8_t i = 0; i < thisCount; i++) {
+            encoders_pad_a[i] = encoders_pad_a_right[i];
+            encoders_pad_b[i] = encoders_pad_b_right[i];
+        }
+    }
+#endif // defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
+
+    // Encoder resolutions is defined differently in config.h, so concatenate
+#if defined(SPLIT_KEYBOARD) && defined(ENCODER_RESOLUTIONS)
+#    if defined(ENCODER_RESOLUTIONS_RIGHT)
+    static const uint8_t encoder_resolutions_right[NUM_ENCODERS_RIGHT] = ENCODER_RESOLUTIONS_RIGHT;
+#    else  // defined(ENCODER_RESOLUTIONS_RIGHT)
+    static const uint8_t encoder_resolutions_right[NUM_ENCODERS_RIGHT] = ENCODER_RESOLUTIONS;
+#    endif // defined(ENCODER_RESOLUTIONS_RIGHT)
+    for (uint8_t i = 0; i < NUM_ENCODERS_RIGHT; i++) {
+        encoder_resolutions[NUM_ENCODERS_LEFT + i] = encoder_resolutions_right[i];
+    }
+#endif // defined(SPLIT_KEYBOARD) && defined(ENCODER_RESOLUTIONS)
+
+    encoder_quadrature_post_init();
+}
+
+static void encoder_handle_state_change(uint8_t index, uint8_t state) {
+    uint8_t i = index;
+
+#ifdef SPLIT_KEYBOARD
+    index += thisHand;
+#endif
+
+#ifdef ENCODER_RESOLUTIONS
+    const uint8_t resolution = encoder_resolutions[index];
+#else
+    const uint8_t resolution = ENCODER_RESOLUTION;
+#endif
+
+    encoder_pulses[i] += encoder_LUT[state & 0xF];
+
+#ifdef ENCODER_DEFAULT_POS
+    if ((encoder_pulses[i] >= resolution) || (encoder_pulses[i] <= -resolution) || ((state & 0x3) == ENCODER_DEFAULT_POS)) {
+        if (encoder_pulses[i] >= 1) {
+#else
+    if (encoder_pulses[i] >= resolution) {
+#endif
+
+            encoder_queue_event(index, ENCODER_COUNTER_CLOCKWISE);
+        }
+
+#ifdef ENCODER_DEFAULT_POS
+        if (encoder_pulses[i] <= -1) {
+#else
+    if (encoder_pulses[i] <= -resolution) { // direction is arbitrary here, but this clockwise
+#endif
+            encoder_queue_event(index, ENCODER_CLOCKWISE);
+        }
+        encoder_pulses[i] %= resolution;
+#ifdef ENCODER_DEFAULT_POS
+        encoder_pulses[i] = 0;
+    }
+#endif
+}
+
+void encoder_quadrature_handle_read(uint8_t index, uint8_t pin_a_state, uint8_t pin_b_state) {
+    uint8_t state = pin_a_state | (pin_b_state << 1);
+    if ((encoder_state[index] & 0x3) != state) {
+        encoder_state[index] <<= 2;
+        encoder_state[index] |= state;
+        encoder_handle_state_change(index, encoder_state[index]);
+    }
+}
+
+__attribute__((weak)) void encoder_driver_task(void) {
+    for (uint8_t i = 0; i < thisCount; i++) {
+        encoder_quadrature_handle_read(i, encoder_quadrature_read_pin(i, false), encoder_quadrature_read_pin(i, true));
+    }
+}

keyboards/mechwild/sugarglider/matrix.c

@@ -50,7 +50,7 @@ static void select_row(uint8_t row) {
         //wait_us(100);
         return;
     }
-    
+
     if (row > 1) {
         mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTB, ALL_INPUT);
         mcp23018_errors += !mcp23018_set_config(I2C_ADDR, mcp23018_PORTA, ~(row_pos[row]));
@@ -87,8 +87,10 @@ bool matrix_scan_custom(matrix_row_t current_matrix[]) {
     bool changed = false;
     for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
         changed |= read_cols_on_row(current_matrix, current_row);
+
 #ifdef ENCODER_ENABLE
-        encoder_read();
+        // Need to frequently read the encoder pins while scanning because the I/O expander takes a long time in comparison.
+        encoder_driver_task();
 #endif
     }
     return changed;

keyboards/pica40/rev2/post_rules.mk

@@ -1,8 +0,0 @@
-# if ENCODER_ENABLE is set, add defines but avoid adding encoder.c as it's replaced by custom code in rev2.c
-ifeq ($(strip $(ENCODER_ENABLE)), yes)
-	ENCODER_ENABLE := no
-    OPT_DEFS += -DENCODER_ENABLE
-    ifeq ($(strip $(ENCODER_MAP_ENABLE)), yes)
-        OPT_DEFS += -DENCODER_MAP_ENABLE
-    endif
-endif

keyboards/pica40/rev2/rev2.c

@@ -2,99 +2,29 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "rev2.h"
+#include "gpio.h"
 
 #ifdef ENCODER_ENABLE // code based on encoder.c
 
-static const pin_t encoders_pad_a[] = ENCODERS_PAD_A;
-static const 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  = 3;
-static int8_t  encoder_pulses = 0;
-static uint8_t encoder_value  = 0;
-
-typedef struct encoder_sync_data {
-    int value;
-} encoder_sync_data;
+#define ENCODER_PIN_A (((pin_t[])ENCODERS_PAD_A)[0])
+#define ENCODER_PIN_B (((pin_t[])ENCODERS_PAD_B)[0])
 
 // custom handler that returns encoder B pin status from slave side
 void encoder_sync_slave_handler(uint8_t in_buflen, const void *in_data, uint8_t out_buflen, void *out_data) {
-    encoder_sync_data *data = (encoder_sync_data *)out_data;
-    data->value = readPin(encoders_pad_b[0]);
-}
-
-__attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) {
-    return true;
+    *(uint8_t *)out_data = readPin(ENCODER_PIN_B) ? 1 : 0;
 }
 
-bool encoder_update_kb(uint8_t index, bool clockwise) {
-    if (!encoder_update_user(index, clockwise)) return false;
-
-    tap_code(clockwise ? KC_VOLU : KC_VOLD);
+void encoder_quadrature_init_pin(uint8_t index, bool pad_b) {}
 
-    return false;
-}
-
-#ifdef ENCODER_MAP_ENABLE
-static void encoder_exec_mapping(uint8_t index, bool clockwise) {
-    action_exec(clockwise ? ENCODER_CW_EVENT(index, true) : ENCODER_CCW_EVENT(index, true));
-    wait_ms(ENCODER_MAP_KEY_DELAY);
-    action_exec(clockwise ? ENCODER_CW_EVENT(index, false) : ENCODER_CCW_EVENT(index, false));
-    wait_ms(ENCODER_MAP_KEY_DELAY);
-}
-#endif // ENCODER_MAP_ENABLE
-
-void encoder_init(void) {
-    setPinInputHigh(encoders_pad_a[0]);
-    setPinInputHigh(encoders_pad_b[0]);
-    wait_us(100);
-    transaction_register_rpc(ENCODER_SYNC, encoder_sync_slave_handler);
-}
-
-bool encoder_read(void) {
-    // ignore if running on slave side
-    if (!is_keyboard_master()) return false;
-
-    bool changed = false;
-    encoder_sync_data data = {0};
-    // request pin B status from slave side
-    if (transaction_rpc_recv(ENCODER_SYNC, sizeof(data), &data)) {
-        uint8_t new_status = (readPin(encoders_pad_a[0]) << 0) | (data.value << 1);
-        if ((encoder_state & 0x3) != new_status) {
-            encoder_state <<= 2;
-            encoder_state |= new_status;
-            encoder_pulses += encoder_LUT[encoder_state & 0xF];
-
-            if (encoder_pulses >= ENCODER_RESOLUTION) {
-                encoder_value++;
-                changed = true;
-#ifdef ENCODER_MAP_ENABLE
-                encoder_exec_mapping(0, false);
-#else  // ENCODER_MAP_ENABLE
-                encoder_update_kb(0, false);
-#endif // ENCODER_MAP_ENABLE
-            }
-
-            if (encoder_pulses <= -ENCODER_RESOLUTION) {
-                encoder_value--;
-                changed = true;
-#ifdef ENCODER_MAP_ENABLE
-                encoder_exec_mapping(0, true);
-#else  // ENCODER_MAP_ENABLE
-                encoder_update_kb(0, true);
-#endif // ENCODER_MAP_ENABLE
-            }
-
-            encoder_pulses %= ENCODER_RESOLUTION;
-        }
+uint8_t encoder_quadrature_read_pin(uint8_t index, bool pad_b) {
+    if(pad_b) {
+        uint8_t data = 0;
+        transaction_rpc_recv(ENCODER_SYNC, sizeof(data), &data);
+        return data;
     }
-    return changed;
+    return readPin(ENCODER_PIN_A) ? 1 : 0;
 }
 
-// do not use standard split encoder transactions
-void encoder_state_raw(uint8_t *slave_state) {}
-void encoder_update_raw(uint8_t *slave_state) {}
-
 #endif // ENCODER_ENABLE
 
 #ifdef PICA40_RGBLIGHT_TIMEOUT
@@ -125,6 +55,12 @@ bool should_set_rgblight = false;
 void keyboard_post_init_kb(void) {
     setPinOutput(PICA40_RGB_POWER_PIN);
 
+#ifdef ENCODER_ENABLE
+    setPinInputHigh(ENCODER_PIN_A);
+    setPinInputHigh(ENCODER_PIN_B);
+    transaction_register_rpc(ENCODER_SYNC, encoder_sync_slave_handler);
+#endif // ENCODER_ENABLE
+
 #ifdef PICA40_RGBLIGHT_TIMEOUT
     idle_timer = timer_read();
     check_rgblight_timer = timer_read();

keyboards/planck/rev7/info.json

@@ -26,7 +26,14 @@
   },
   "encoder": {
     "rotary": [
-      {"pin_a": "B12", "pin_b": "B13"}
+        {"pin_a": "B12", "pin_b": "B13"},
+        {"pin_a": "B12", "pin_b": "B13"},
+        {"pin_a": "B12", "pin_b": "B13"},
+        {"pin_a": "B12", "pin_b": "B13"},
+        {"pin_a": "B12", "pin_b": "B13"},
+        {"pin_a": "B12", "pin_b": "B13"},
+        {"pin_a": "B12", "pin_b": "B13"},
+        {"pin_a": "B12", "pin_b": "B13"}
     ]
   },
   "features": {

keyboards/planck/rev7/matrix.c

@@ -32,31 +32,16 @@
 #define STM32_IWDG_RL_MS(s) STM32_IWDG_RL_US(s * 1000.0)
 #define STM32_IWDG_RL_S(s) STM32_IWDG_RL_US(s * 1000000.0)
 
-#if !defined(PLANCK_ENCODER_RESOLUTION)
-#    define PLANCK_ENCODER_RESOLUTION 4
-#endif
-
 #if !defined(PLANCK_WATCHDOG_TIMEOUT)
 #   define PLANCK_WATCHDOG_TIMEOUT 1.0
 #endif
 
-#ifdef ENCODER_MAP_ENABLE
-#error "The encoder map feature is not currently supported by the Planck's encoder matrix"
-#endif
-
 /* matrix state(1:on, 0:off) */
 static pin_t matrix_row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
 static pin_t matrix_col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
 
 static matrix_row_t matrix_inverted[MATRIX_COLS];
 
-#ifdef ENCODER_ENABLE
-int8_t  encoder_LUT[]     = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0};
-uint8_t encoder_state[8]  = {0};
-int8_t  encoder_pulses[8] = {0};
-uint8_t encoder_value[8]  = {0};
-#endif
-
 void matrix_init_custom(void) {
     // actual matrix setup - cols
     for (int i = 0; i < MATRIX_COLS; i++) {
@@ -84,31 +69,6 @@ void matrix_init_custom(void) {
 #endif
 }
 
-#ifdef ENCODER_ENABLE
-bool encoder_update(uint8_t index, uint8_t state) {
-    bool    changed = false;
-    uint8_t i       = index;
-
-    encoder_pulses[i] += encoder_LUT[state & 0xF];
-
-    if (encoder_pulses[i] >= PLANCK_ENCODER_RESOLUTION) {
-        encoder_value[index]++;
-        changed = true;
-        encoder_update_kb(index, false);
-    }
-    if (encoder_pulses[i] <= -PLANCK_ENCODER_RESOLUTION) {
-        encoder_value[index]--;
-        changed = true;
-        encoder_update_kb(index, true);
-    }
-    encoder_pulses[i] %= PLANCK_ENCODER_RESOLUTION;
-#ifdef ENCODER_DEFAULT_POS
-    encoder_pulses[i] = 0;
-#endif
-    return changed;
-}
-#endif
-
 bool matrix_scan_custom(matrix_row_t current_matrix[]) {
 #ifndef PLANCK_WATCHDOG_DISABLE
     // reset watchdog
@@ -149,40 +109,16 @@ bool matrix_scan_custom(matrix_row_t current_matrix[]) {
         changed |= old != current_matrix[row];
     }
 
-#ifdef ENCODER_ENABLE
-    // encoder-matrix functionality
-
-    // set up C/rows for encoder read
-    for (int i = 0; i < MATRIX_ROWS; i++) {
-        setPinOutput(matrix_row_pins[i]);
-        writePinHigh(matrix_row_pins[i]);
-    }
-
-    // set up A & B for reading
-    setPinInputHigh(B12);
-    setPinInputHigh(B13);
-
-    for (int i = 0; i < MATRIX_ROWS; i++) {
-        writePinLow(matrix_row_pins[i]);
-        wait_us(10);
-        uint8_t new_status = (palReadPad(GPIOB, 12) << 0) | (palReadPad(GPIOB, 13) << 1);
-        if ((encoder_state[i] & 0x3) != new_status) {
-            encoder_state[i] <<= 2;
-            encoder_state[i] |= new_status;
-            encoder_update(i, encoder_state[i]);
-        }
-        writePinHigh(matrix_row_pins[i]);
-    }
-
-    // revert A & B to matrix state
-    setPinInputLow(B12);
-    setPinInputLow(B13);
-
-    // revert C/rows to matrix state
-    for (int i = 0; i < MATRIX_ROWS; i++) {
-        setPinInputLow(matrix_row_pins[i]);
-    }
-#endif
-
     return changed;
 }
+
+uint8_t encoder_quadrature_read_pin(uint8_t index, bool pad_b) {
+    pin_t pin = pad_b ? B13: B12;
+    setPinInputHigh(pin);
+    writePinLow(matrix_row_pins[index]);
+    wait_us(10);
+    uint8_t ret = readPin(pin) ? 1 : 0;
+    setPinInputLow(matrix_row_pins[index]);
+    setPinInputLow(pin);
+    return ret;
+}

keyboards/ploopyco/mouse/config.h

@@ -32,3 +32,6 @@
 
 /* PMW33XX Settings */
 #define PMW33XX_CS_PIN B0
+
+/* Custom encoder needs to specify just how many encoders we have */
+#define NUM_ENCODERS 1

keyboards/ploopyco/mouse/info.json

@@ -31,6 +31,12 @@
             ["D4", "D2", "E6", "B6", "D7", "C6", "C7", "B7"]
         ]
     },
+    "features": {
+        "encoder": true
+    },
+    "encoder": {
+        "driver": "custom"
+    },
     "layouts": {
         "LAYOUT": {
             "layout": [

keyboards/ploopyco/mouse/mouse.c

@@ -66,8 +66,6 @@ uint8_t  OptLowPin         = OPT_ENC1;
 bool     debug_encoder     = false;
 bool     is_drag_scroll    = false;
 
-__attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) { return true; }
-
 bool encoder_update_kb(uint8_t index, bool clockwise) {
     if (!encoder_update_user(index, clockwise)) {
         return false;
@@ -83,7 +81,14 @@ bool encoder_update_kb(uint8_t index, bool clockwise) {
     return true;
 }
 
-void process_wheel(void) {
+void encoder_driver_init(void) {
+    setPinInput(OPT_ENC1);
+    setPinInput(OPT_ENC2);
+
+    opt_encoder_init();
+}
+
+void encoder_driver_task(void) {
     // Lovingly ripped from the Ploopy Source
 
     // If the mouse wheel was just released, do not scroll.
@@ -111,12 +116,10 @@ void process_wheel(void) {
     int dir = opt_encoder_handler(p1, p2);
 
     if (dir == 0) return;
-    encoder_update_kb(0, dir > 0);
+    encoder_queue_event(0, dir == 1);
 }
 
 report_mouse_t pointing_device_task_kb(report_mouse_t mouse_report) {
-    process_wheel();
-
     if (is_drag_scroll) {
         mouse_report.h = mouse_report.x;
 #ifdef PLOOPY_DRAGSCROLL_INVERT
@@ -177,9 +180,6 @@ void keyboard_pre_init_kb(void) {
     // debug_mouse   = true;
     // debug_encoder = true;
 
-    setPinInput(OPT_ENC1);
-    setPinInput(OPT_ENC2);
-
     /* Ground all output pins connected to ground. This provides additional
      * pathways to ground. If you're messing with this, know this: driving ANY
      * of these pins high will cause a short. On the MCU. Ka-blooey.
@@ -204,8 +204,6 @@ void keyboard_pre_init_kb(void) {
 
 void pointing_device_init_kb(void) {
     pointing_device_set_cpi(dpi_array[keyboard_config.dpi_config]);
-    // initialize the scroll wheel's optical encoder
-    opt_encoder_init();
 }
 
 void eeconfig_init_kb(void) {

keyboards/ploopyco/mouse/rules.mk

@@ -16,9 +16,6 @@ POINTING_DEVICE_ENABLE = yes
 POINTING_DEVICE_DRIVER = pmw3360
 MOUSEKEY_ENABLE = yes       # Mouse keys
 
-ENCODER_ENABLE := no
-OPTS_DEF += -DENCODER_ENABLE
-
 ANALOG_DRIVER_REQUIRED = yes
 
 SRC += opt_encoder.c

keyboards/ploopyco/trackball/config.h

@@ -31,3 +31,6 @@
 /* PMW33XX Settings */
 #define PMW33XX_CS_PIN             B0
 #define POINTING_DEVICE_INVERT_Y
+
+/* Custom encoder needs to specify just how many encoders we have */
+#define NUM_ENCODERS 1

keyboards/ploopyco/trackball/info.json

@@ -12,6 +12,12 @@
     "bootmagic": {
         "matrix": [0, 3]
     },
+    "features": {
+        "encoder": true
+    },
+    "encoder": {
+        "driver": "custom"
+    },
     "layouts": {
         "LAYOUT": {
             "layout": [

keyboards/ploopyco/trackball/rules.mk

@@ -16,9 +16,6 @@ POINTING_DEVICE_ENABLE = yes
 POINTING_DEVICE_DRIVER = pmw3360
 MOUSEKEY_ENABLE = yes       # Mouse keys
 
-ENCODER_ENABLE := no
-OPTS_DEF += -DENCODER_ENABLE
-
 ANALOG_DRIVER_REQUIRED = yes
 
 SRC += opt_encoder.c

keyboards/ploopyco/trackball/trackball.c

@@ -66,8 +66,6 @@ uint8_t  OptLowPin         = OPT_ENC1;
 bool     debug_encoder     = false;
 bool     is_drag_scroll    = false;
 
-__attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) { return true; }
-
 bool encoder_update_kb(uint8_t index, bool clockwise) {
     if (!encoder_update_user(index, clockwise)) {
         return false;
@@ -83,7 +81,15 @@ bool encoder_update_kb(uint8_t index, bool clockwise) {
     return true;
 }
 
-void process_wheel(void) {
+
+void encoder_driver_init(void) {
+    setPinInput(OPT_ENC1);
+    setPinInput(OPT_ENC2);
+
+    opt_encoder_init();
+}
+
+void encoder_driver_task(void) {
     // TODO: Replace this with interrupt driven code,  polling is S L O W
     // Lovingly ripped from the Ploopy Source
 
@@ -112,11 +118,10 @@ void process_wheel(void) {
     int dir = opt_encoder_handler(p1, p2);
 
     if (dir == 0) return;
-    encoder_update_kb(0, dir > 0);
+    encoder_queue_event(0, dir == 1);
 }
 
 report_mouse_t pointing_device_task_kb(report_mouse_t mouse_report) {
-    process_wheel();
 
     if (is_drag_scroll) {
 #ifdef PLOOPY_DRAGSCROLL_H_INVERT
@@ -189,9 +194,6 @@ void keyboard_pre_init_kb(void) {
     // debug_mouse   = true;
     // debug_encoder = true;
 
-    setPinInput(OPT_ENC1);
-    setPinInput(OPT_ENC2);
-
     /* Ground all output pins connected to ground. This provides additional
      * pathways to ground. If you're messing with this, know this: driving ANY
      * of these pins high will cause a short. On the MCU. Ka-blooey.
@@ -216,8 +218,6 @@ void keyboard_pre_init_kb(void) {
 
 void pointing_device_init_kb(void) {
     pointing_device_set_cpi(dpi_array[keyboard_config.dpi_config]);
-    // initialize the scroll wheel's optical encoder
-    opt_encoder_init();
 }
 
 void eeconfig_init_kb(void) {

keyboards/ploopyco/trackball_mini/config.h

@@ -32,3 +32,6 @@
 #define ADNS5050_CS_PIN           B4
 
 #define POINTING_DEVICE_ROTATION_270
+
+/* Custom encoder needs to specify just how many encoders we have */
+#define NUM_ENCODERS 1

keyboards/ploopyco/trackball_mini/info.json

@@ -14,6 +14,12 @@
     },
     "processor": "atmega32u4",
     "bootloader": "atmel-dfu",
+    "features": {
+        "encoder": true
+    },
+    "encoder": {
+        "driver": "custom"
+    },
     "layouts": {
         "LAYOUT": {
             "layout": [

keyboards/ploopyco/trackball_mini/rules.mk

@@ -13,9 +13,6 @@ POINTING_DEVICE_ENABLE = yes
 POINTING_DEVICE_DRIVER = adns5050
 MOUSEKEY_ENABLE = yes        # Mouse keys
 
-ENCODER_ENABLE := no
-OPTS_DEF += -DENCODER_ENABLE
-
 ANALOG_DRIVER_REQUIRED = yes
 
 SRC += opt_encoder.c

keyboards/ploopyco/trackball_mini/trackball_mini.c

@@ -74,8 +74,6 @@ uint8_t  OptLowPin         = OPT_ENC1;
 bool     debug_encoder     = false;
 bool     is_drag_scroll    = false;
 
-__attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) { return true; }
-
 bool encoder_update_kb(uint8_t index, bool clockwise) {
     if (!encoder_update_user(index, clockwise)) {
         return false;
@@ -91,7 +89,14 @@ bool encoder_update_kb(uint8_t index, bool clockwise) {
     return true;
 }
 
-void process_wheel(void) {
+void encoder_driver_init(void) {
+    setPinInput(OPT_ENC1);
+    setPinInput(OPT_ENC2);
+
+    opt_encoder_init();
+}
+
+void encoder_driver_task(void) {
     uint16_t p1 = adc_read(OPT_ENC1_MUX);
     uint16_t p2 = adc_read(OPT_ENC2_MUX);
 
@@ -113,21 +118,17 @@ void process_wheel(void) {
     }
 
     if (dir == 0) return;
-    encoder_update_kb(0, dir > 0);
+    encoder_queue_event(0, dir == 1);
 
     lastScroll = timer_read();
 }
 
 void pointing_device_init_kb(void) {
-    opt_encoder_init();
-
     // set the DPI.
     pointing_device_set_cpi(dpi_array[keyboard_config.dpi_config]);
 }
 
 report_mouse_t pointing_device_task_kb(report_mouse_t mouse_report) {
-    process_wheel();
-
     if (is_drag_scroll) {
         mouse_report.h = mouse_report.x;
 #ifdef PLOOPY_DRAGSCROLL_INVERT
@@ -180,9 +181,6 @@ void keyboard_pre_init_kb(void) {
     // debug_mouse = true;
     // debug_encoder = true;
 
-    setPinInput(OPT_ENC1);
-    setPinInput(OPT_ENC2);
-
     /* Ground all output pins connected to ground. This provides additional
      * pathways to ground. If you're messing with this, know this: driving ANY
      * of these pins high will cause a short. On the MCU. Ka-blooey.

keyboards/ploopyco/trackball_thumb/config.h

@@ -31,3 +31,6 @@
 
 /* PMW3360 Settings */
 #define POINTING_DEVICE_CS_PIN B0
+
+/* Custom encoder needs to specify just how many encoders we have */
+#define NUM_ENCODERS 1

keyboards/ploopyco/trackball_thumb/info.json

@@ -18,7 +18,10 @@
         "mousekey": true,
         "nkro": true,
         "pointing_device": true,
-        "encoder": false
+        "encoder": true
+    },
+    "encoder": {
+        "driver": "custom"
     },
     "layouts": {
         "LAYOUT": {

keyboards/ploopyco/trackball_thumb/post_rules.mk

@@ -1,4 +0,0 @@
-# Force encoder to be disabled
-# But enable the defines for it
-ENCODER_ENABLE := no
-OPT_DEFS += -DENCODER_ENABLE

keyboards/ploopyco/trackball_thumb/trackball_thumb.c

@@ -17,6 +17,7 @@
  */
 
 #include "trackball_thumb.h"
+#include "encoder.h"
 
 #ifndef OPT_DEBOUNCE
 #    define OPT_DEBOUNCE 5  // (ms) 			Time between scroll events
@@ -57,9 +58,6 @@ uint16_t last_mid_click    = 0;  // Stops scrollwheel from being read if it was
 bool     debug_encoder     = false;
 bool     is_drag_scroll    = false;
 
-// require, since core encoder.c (where is is normally defined isn't present
-__attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) { return true; }
-
 bool encoder_update_kb(uint8_t index, bool clockwise) {
     if (!encoder_update_user(index, clockwise)) {
         return false;
@@ -75,25 +73,25 @@ bool encoder_update_kb(uint8_t index, bool clockwise) {
     return true;
 }
 
-void encoder_init(void) { opt_encoder_init(); }
+void encoder_driver_init(void) { opt_encoder_init(); }
 
-bool encoder_read(void) {
+void encoder_driver_task(void) {
     // Lovingly ripped from the Ploopy Source
 
     // If the mouse wheel was just released, do not scroll.
     if (timer_elapsed(last_mid_click) < SCROLL_BUTT_DEBOUNCE) {
-        return false;
+        return;
     }
 
     // Limit the number of scrolls per unit time.
     if (timer_elapsed(last_scroll) < OPT_DEBOUNCE) {
-        return false;
+        return;
     }
 
     // Don't scroll if the middle button is depressed.
     if (is_scroll_clicked) {
 #ifndef IGNORE_SCROLL_CLICK
-        return false;
+        return;
 #endif
     }
 
@@ -104,10 +102,8 @@ bool encoder_read(void) {
 
     int dir = opt_encoder_handler(p1, p2);
 
-    if (dir == 0) return false;
-    ;
-    encoder_update_kb(0, dir == 1);
-    return true;
+    if (dir == 0) return;
+    encoder_queue_event(0, dir == 1);
 }
 
 report_mouse_t pointing_device_task_kb(report_mouse_t mouse_report) {

keyboards/ploopyco/trackball_thumb/trackball_thumb.h

@@ -28,9 +28,6 @@
 #define OPT_ENC1_MUX 4
 #define OPT_ENC2_MUX 0
 
-bool encoder_update_kb(uint8_t index, bool clockwise);
-bool encoder_update_user(uint8_t index, bool clockwise);
-
 typedef union {
     uint32_t raw;
     struct {

quantum/encoder.c

@@ -1,81 +1,110 @@
-/*
- * Copyright 2018 Jack Humbert <jack.humb@gmail.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2022-2023 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "encoder.h"
-#include "keyboard.h"
+#include <string.h>
 #include "action.h"
-#include "keycodes.h"
+#include "encoder.h"
 #include "wait.h"
 
-#ifdef SPLIT_KEYBOARD
-#    include "split_util.h"
-#endif
-
-// for memcpy
-#include <string.h>
-
 #ifndef ENCODER_MAP_KEY_DELAY
-#    include "action.h"
 #    define ENCODER_MAP_KEY_DELAY TAP_CODE_DELAY
 #endif
 
-#if !defined(ENCODER_RESOLUTIONS) && !defined(ENCODER_RESOLUTION)
-#    define ENCODER_RESOLUTION 4
-#endif
+__attribute__((weak)) bool should_process_encoder(void) {
+    return is_keyboard_master();
+}
 
-#if !defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)
-#    error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B"
-#endif
+static encoder_events_t encoder_events;
+
+void encoder_init(void) {
+    memset(&encoder_events, 0, sizeof(encoder_events));
+    encoder_driver_init();
+}
 
-extern volatile bool isLeftHand;
+static bool encoder_handle_queue(void) {
+    bool changed = false;
+    while (encoder_events.tail != encoder_events.head) {
+        encoder_event_t event = encoder_events.queue[encoder_events.tail];
+        encoder_events.tail   = (encoder_events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
 
-static pin_t encoders_pad_a[NUM_ENCODERS_MAX_PER_SIDE] = ENCODERS_PAD_A;
-static pin_t encoders_pad_b[NUM_ENCODERS_MAX_PER_SIDE] = ENCODERS_PAD_B;
+#ifdef ENCODER_MAP_ENABLE
 
-#ifdef ENCODER_RESOLUTIONS
-static uint8_t encoder_resolutions[NUM_ENCODERS] = ENCODER_RESOLUTIONS;
-#endif
+        // The delays below cater for Windows and its wonderful requirements.
+        action_exec(event.clockwise ? MAKE_ENCODER_CW_EVENT(event.index, true) : MAKE_ENCODER_CCW_EVENT(event.index, true));
+#    if ENCODER_MAP_KEY_DELAY > 0
+        wait_ms(ENCODER_MAP_KEY_DELAY);
+#    endif // ENCODER_MAP_KEY_DELAY > 0
 
-#ifndef ENCODER_DIRECTION_FLIP
-#    define ENCODER_CLOCKWISE true
-#    define ENCODER_COUNTER_CLOCKWISE false
-#else
-#    define ENCODER_CLOCKWISE false
-#    define ENCODER_COUNTER_CLOCKWISE true
-#endif
-static int8_t encoder_LUT[] = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0};
+        action_exec(event.clockwise ? MAKE_ENCODER_CW_EVENT(event.index, false) : MAKE_ENCODER_CCW_EVENT(event.index, false));
+#    if ENCODER_MAP_KEY_DELAY > 0
+        wait_ms(ENCODER_MAP_KEY_DELAY);
+#    endif // ENCODER_MAP_KEY_DELAY > 0
+
+#else // ENCODER_MAP_ENABLE
+
+        encoder_update_kb(event.index, event.clockwise ? true : false);
+
+#endif // ENCODER_MAP_ENABLE
+
+        changed = true;
+    }
+    return changed;
+}
 
-static uint8_t encoder_state[NUM_ENCODERS]  = {0};
-static int8_t  encoder_pulses[NUM_ENCODERS] = {0};
+bool encoder_task(void) {
+    bool changed = false;
 
-// encoder counts
-static uint8_t thisCount;
 #ifdef SPLIT_KEYBOARD
-// encoder offsets for each hand
-static uint8_t thisHand, thatHand;
-// encoder counts for each hand
-static uint8_t thatCount;
-#endif
+    // Attempt to process existing encoder events in case split handling has already enqueued events
+    if (should_process_encoder()) {
+        changed |= encoder_handle_queue();
+    }
+#endif // SPLIT_KEYBOARD
+
+    // Let the encoder driver produce events
+    encoder_driver_task();
+
+    // Process any events that were enqueued
+    if (should_process_encoder()) {
+        changed |= encoder_handle_queue();
+    }
+
+    return changed;
+}
+
+bool encoder_queue_event(uint8_t index, bool clockwise) {
+    // Drop out if we're full
+    if ((encoder_events.head + 1) % MAX_QUEUED_ENCODER_EVENTS == encoder_events.tail) {
+        return false;
+    }
+
+    // Append the event
+    encoder_event_t new_event                 = {.index = index, .clockwise = clockwise ? 1 : 0};
+    encoder_events.queue[encoder_events.head] = new_event;
+
+    // Increment the head index
+    encoder_events.head = (encoder_events.head + 1) % MAX_QUEUED_ENCODER_EVENTS;
+
+    return true;
+}
+
+void encoder_retrieve_events(encoder_events_t *events) {
+    memcpy(events, &encoder_events, sizeof(encoder_events));
+}
 
-static uint8_t encoder_value[NUM_ENCODERS] = {0};
+#ifdef SPLIT_KEYBOARD
+void encoder_set_tail_index(uint8_t tail_index) {
+    encoder_events.tail = tail_index;
+}
 
-__attribute__((weak)) void encoder_wait_pullup_charge(void) {
-    wait_us(100);
+void encoder_handle_slave_events(encoder_events_t *events) {
+    while (events->tail != events->head) {
+        encoder_event_t event = events->queue[events->tail];
+        events->tail          = (events->tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        encoder_queue_event(event.index, event.clockwise ? true : false);
+    }
 }
+#endif // SPLIT_KEYBOARD
 
 __attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) {
     return true;
@@ -106,192 +135,3 @@ __attribute__((weak)) bool encoder_update_kb(uint8_t index, bool clockwise) {
 #endif // ENCODER_TESTS
     return res;
 }
-
-__attribute__((weak)) bool should_process_encoder(void) {
-    return is_keyboard_master();
-}
-
-void encoder_init(void) {
-#ifdef SPLIT_KEYBOARD
-    thisHand  = isLeftHand ? 0 : NUM_ENCODERS_LEFT;
-    thatHand  = NUM_ENCODERS_LEFT - thisHand;
-    thisCount = isLeftHand ? NUM_ENCODERS_LEFT : NUM_ENCODERS_RIGHT;
-    thatCount = isLeftHand ? NUM_ENCODERS_RIGHT : NUM_ENCODERS_LEFT;
-#else // SPLIT_KEYBOARD
-    thisCount                = NUM_ENCODERS;
-#endif
-
-#ifdef ENCODER_TESTS
-    // Annoying that we have to clear out values during initialisation here, but
-    // because all the arrays are static locals, rerunning tests in the same
-    // executable doesn't reset any of these. Kinda crappy having test-only code
-    // here, but it's the simplest solution.
-    memset(encoder_value, 0, sizeof(encoder_value));
-    memset(encoder_state, 0, sizeof(encoder_state));
-    memset(encoder_pulses, 0, sizeof(encoder_pulses));
-    static const pin_t encoders_pad_a_left[] = ENCODERS_PAD_A;
-    static const pin_t encoders_pad_b_left[] = ENCODERS_PAD_B;
-    for (uint8_t i = 0; i < thisCount; i++) {
-        encoders_pad_a[i] = encoders_pad_a_left[i];
-        encoders_pad_b[i] = encoders_pad_b_left[i];
-    }
-#endif
-
-#if defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
-    // Re-initialise the pads if it's the right-hand side
-    if (!isLeftHand) {
-        static const pin_t encoders_pad_a_right[] = ENCODERS_PAD_A_RIGHT;
-        static const pin_t encoders_pad_b_right[] = ENCODERS_PAD_B_RIGHT;
-        for (uint8_t i = 0; i < thisCount; i++) {
-            encoders_pad_a[i] = encoders_pad_a_right[i];
-            encoders_pad_b[i] = encoders_pad_b_right[i];
-        }
-    }
-#endif // defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
-
-    // Encoder resolutions is handled purely master-side, so concatenate the two arrays
-#if defined(SPLIT_KEYBOARD) && defined(ENCODER_RESOLUTIONS)
-#    if defined(ENCODER_RESOLUTIONS_RIGHT)
-    static const uint8_t encoder_resolutions_right[NUM_ENCODERS_RIGHT] = ENCODER_RESOLUTIONS_RIGHT;
-#    else  // defined(ENCODER_RESOLUTIONS_RIGHT)
-    static const uint8_t encoder_resolutions_right[NUM_ENCODERS_RIGHT] = ENCODER_RESOLUTIONS;
-#    endif // defined(ENCODER_RESOLUTIONS_RIGHT)
-    for (uint8_t i = 0; i < NUM_ENCODERS_RIGHT; i++) {
-        encoder_resolutions[NUM_ENCODERS_LEFT + i] = encoder_resolutions_right[i];
-    }
-#endif // defined(SPLIT_KEYBOARD) && defined(ENCODER_RESOLUTIONS)
-
-    for (uint8_t i = 0; i < thisCount; i++) {
-        gpio_set_pin_input_high(encoders_pad_a[i]);
-        gpio_set_pin_input_high(encoders_pad_b[i]);
-    }
-    encoder_wait_pullup_charge();
-    for (uint8_t i = 0; i < thisCount; i++) {
-        encoder_state[i] = (gpio_read_pin(encoders_pad_a[i]) << 0) | (gpio_read_pin(encoders_pad_b[i]) << 1);
-    }
-}
-
-#ifdef ENCODER_MAP_ENABLE
-static void encoder_exec_mapping(uint8_t index, bool clockwise) {
-    // The delays below cater for Windows and its wonderful requirements.
-    action_exec(clockwise ? MAKE_ENCODER_CW_EVENT(index, true) : MAKE_ENCODER_CCW_EVENT(index, true));
-#    if ENCODER_MAP_KEY_DELAY > 0
-    wait_ms(ENCODER_MAP_KEY_DELAY);
-#    endif // ENCODER_MAP_KEY_DELAY > 0
-
-    action_exec(clockwise ? MAKE_ENCODER_CW_EVENT(index, false) : MAKE_ENCODER_CCW_EVENT(index, false));
-#    if ENCODER_MAP_KEY_DELAY > 0
-    wait_ms(ENCODER_MAP_KEY_DELAY);
-#    endif // ENCODER_MAP_KEY_DELAY > 0
-}
-#endif // ENCODER_MAP_ENABLE
-
-static bool encoder_update(uint8_t index, uint8_t state) {
-    bool    changed = false;
-    uint8_t i       = index;
-
-#ifdef ENCODER_RESOLUTIONS
-    const uint8_t resolution = encoder_resolutions[i];
-#else
-    const uint8_t resolution = ENCODER_RESOLUTION;
-#endif
-
-#ifdef SPLIT_KEYBOARD
-    index += thisHand;
-#endif
-    encoder_pulses[i] += encoder_LUT[state & 0xF];
-
-#ifdef ENCODER_DEFAULT_POS
-    if ((encoder_pulses[i] >= resolution) || (encoder_pulses[i] <= -resolution) || ((state & 0x3) == ENCODER_DEFAULT_POS)) {
-        if (encoder_pulses[i] >= 1) {
-#else
-    if (encoder_pulses[i] >= resolution) {
-#endif
-
-            encoder_value[index]++;
-            changed = true;
-#ifdef SPLIT_KEYBOARD
-            if (should_process_encoder())
-#endif // SPLIT_KEYBOARD
-#ifdef ENCODER_MAP_ENABLE
-                encoder_exec_mapping(index, ENCODER_COUNTER_CLOCKWISE);
-#else  // ENCODER_MAP_ENABLE
-        encoder_update_kb(index, ENCODER_COUNTER_CLOCKWISE);
-#endif // ENCODER_MAP_ENABLE
-        }
-
-#ifdef ENCODER_DEFAULT_POS
-        if (encoder_pulses[i] <= -1) {
-#else
-    if (encoder_pulses[i] <= -resolution) { // direction is arbitrary here, but this clockwise
-#endif
-            encoder_value[index]--;
-            changed = true;
-#ifdef SPLIT_KEYBOARD
-            if (should_process_encoder())
-#endif // SPLIT_KEYBOARD
-#ifdef ENCODER_MAP_ENABLE
-                encoder_exec_mapping(index, ENCODER_CLOCKWISE);
-#else  // ENCODER_MAP_ENABLE
-        encoder_update_kb(index, ENCODER_CLOCKWISE);
-#endif // ENCODER_MAP_ENABLE
-        }
-        encoder_pulses[i] %= resolution;
-#ifdef ENCODER_DEFAULT_POS
-        encoder_pulses[i] = 0;
-    }
-#endif
-    return changed;
-}
-
-bool encoder_read(void) {
-    bool changed = false;
-    for (uint8_t i = 0; i < thisCount; i++) {
-        uint8_t new_status = (gpio_read_pin(encoders_pad_a[i]) << 0) | (gpio_read_pin(encoders_pad_b[i]) << 1);
-        if ((encoder_state[i] & 0x3) != new_status) {
-            encoder_state[i] <<= 2;
-            encoder_state[i] |= new_status;
-            changed |= encoder_update(i, encoder_state[i]);
-        }
-    }
-    return changed;
-}
-
-#ifdef SPLIT_KEYBOARD
-void last_encoder_activity_trigger(void);
-
-void encoder_state_raw(uint8_t *slave_state) {
-    memcpy(slave_state, &encoder_value[thisHand], sizeof(uint8_t) * thisCount);
-}
-
-void encoder_update_raw(uint8_t *slave_state) {
-    bool changed = false;
-    for (uint8_t i = 0; i < thatCount; i++) { // Note inverted logic -- we want the opposite side
-        const uint8_t index = i + thatHand;
-        int8_t        delta = slave_state[i] - encoder_value[index];
-        while (delta > 0) {
-            delta--;
-            encoder_value[index]++;
-            changed = true;
-#    ifdef ENCODER_MAP_ENABLE
-            encoder_exec_mapping(index, ENCODER_COUNTER_CLOCKWISE);
-#    else  // ENCODER_MAP_ENABLE
-            encoder_update_kb(index, ENCODER_COUNTER_CLOCKWISE);
-#    endif // ENCODER_MAP_ENABLE
-        }
-        while (delta < 0) {
-            delta++;
-            encoder_value[index]--;
-            changed = true;
-#    ifdef ENCODER_MAP_ENABLE
-            encoder_exec_mapping(index, ENCODER_CLOCKWISE);
-#    else  // ENCODER_MAP_ENABLE
-            encoder_update_kb(index, ENCODER_CLOCKWISE);
-#    endif // ENCODER_MAP_ENABLE
-        }
-    }
-
-    // Update the last encoder input time -- handled external to encoder_read() when we're running a split
-    if (changed) last_encoder_activity_trigger();
-}
-#endif

quantum/encoder.h

@@ -22,45 +22,88 @@
 #include "gpio.h"
 #include "util.h"
 
+#ifdef ENCODER_ENABLE
+
+__attribute__((weak)) bool should_process_encoder(void);
+
 void encoder_init(void);
-bool encoder_read(void);
+bool encoder_task(void);
+bool encoder_queue_event(uint8_t index, bool clockwise);
 
 bool encoder_update_kb(uint8_t index, bool clockwise);
 bool encoder_update_user(uint8_t index, bool clockwise);
 
-#ifdef SPLIT_KEYBOARD
+#    ifdef SPLIT_KEYBOARD
+
+#        if defined(ENCODERS_PAD_A_RIGHT)
+#            ifndef NUM_ENCODERS_LEFT
+#                define NUM_ENCODERS_LEFT ARRAY_SIZE(((pin_t[])ENCODERS_PAD_A))
+#            endif
+#            ifndef NUM_ENCODERS_RIGHT
+#                define NUM_ENCODERS_RIGHT ARRAY_SIZE(((pin_t[])ENCODERS_PAD_A_RIGHT))
+#            endif
+#        else
+#            ifndef NUM_ENCODERS_LEFT
+#                define NUM_ENCODERS_LEFT ARRAY_SIZE(((pin_t[])ENCODERS_PAD_A))
+#            endif
+#            ifndef NUM_ENCODERS_RIGHT
+#                define NUM_ENCODERS_RIGHT NUM_ENCODERS_LEFT
+#            endif
+#        endif
+#        ifndef NUM_ENCODERS
+#            define NUM_ENCODERS (NUM_ENCODERS_LEFT + NUM_ENCODERS_RIGHT)
+#        endif
+
+#    else // SPLIT_KEYBOARD
 
-void encoder_state_raw(uint8_t* slave_state);
-void encoder_update_raw(uint8_t* slave_state);
+#        ifndef NUM_ENCODERS
+#            define NUM_ENCODERS ARRAY_SIZE(((pin_t[])ENCODERS_PAD_A))
+#        endif
+#        define NUM_ENCODERS_LEFT NUM_ENCODERS
+#        define NUM_ENCODERS_RIGHT 0
 
-#    if defined(ENCODERS_PAD_A_RIGHT)
-#        define NUM_ENCODERS_LEFT ARRAY_SIZE(((pin_t[])ENCODERS_PAD_A))
-#        define NUM_ENCODERS_RIGHT ARRAY_SIZE(((pin_t[])ENCODERS_PAD_A_RIGHT))
-#    else
-#        define NUM_ENCODERS_LEFT ARRAY_SIZE(((pin_t[])ENCODERS_PAD_A))
-#        define NUM_ENCODERS_RIGHT NUM_ENCODERS_LEFT
-#    endif
-#    define NUM_ENCODERS (NUM_ENCODERS_LEFT + NUM_ENCODERS_RIGHT)
+#    endif // SPLIT_KEYBOARD
 
-#else // SPLIT_KEYBOARD
+#    ifndef NUM_ENCODERS
+#        define NUM_ENCODERS 0
+#        define NUM_ENCODERS_LEFT 0
+#        define NUM_ENCODERS_RIGHT 0
+#    endif // NUM_ENCODERS
 
-#    define NUM_ENCODERS ARRAY_SIZE(((pin_t[])ENCODERS_PAD_A))
-#    define NUM_ENCODERS_LEFT NUM_ENCODERS
-#    define NUM_ENCODERS_RIGHT 0
+#    define NUM_ENCODERS_MAX_PER_SIDE MAX(NUM_ENCODERS_LEFT, NUM_ENCODERS_RIGHT)
 
-#endif // SPLIT_KEYBOARD
+#    ifndef MAX_QUEUED_ENCODER_EVENTS
+#        define MAX_QUEUED_ENCODER_EVENTS MAX(4, ((NUM_ENCODERS_MAX_PER_SIDE) + 1))
+#    endif // MAX_QUEUED_ENCODER_EVENTS
 
-#ifndef NUM_ENCODERS
-#    define NUM_ENCODERS 0
-#    define NUM_ENCODERS_LEFT 0
-#    define NUM_ENCODERS_RIGHT 0
-#endif // NUM_ENCODERS
+typedef struct encoder_event_t {
+    uint8_t index : 7;
+    uint8_t clockwise : 1;
+} encoder_event_t;
 
-#define NUM_ENCODERS_MAX_PER_SIDE MAX(NUM_ENCODERS_LEFT, NUM_ENCODERS_RIGHT)
+typedef struct encoder_events_t {
+    uint8_t         head;
+    uint8_t         tail;
+    encoder_event_t queue[MAX_QUEUED_ENCODER_EVENTS];
+} encoder_events_t;
 
-#ifdef ENCODER_MAP_ENABLE
-#    define NUM_DIRECTIONS 2
-#    define ENCODER_CCW_CW(ccw, cw) \
-        { (cw), (ccw) }
+// Get the current queued events
+void encoder_retrieve_events(encoder_events_t *events);
+
+#    ifdef SPLIT_KEYBOARD
+void encoder_set_tail_index(uint8_t tail_index);
+void encoder_handle_slave_events(encoder_events_t *events);
+#    endif // SPLIT_KEYBOARD
+
+#    ifdef ENCODER_MAP_ENABLE
+#        define NUM_DIRECTIONS 2
+#        define ENCODER_CCW_CW(ccw, cw) \
+            { (cw), (ccw) }
 extern const uint16_t encoder_map[][NUM_ENCODERS][NUM_DIRECTIONS];
-#endif // ENCODER_MAP_ENABLE
+#    endif // ENCODER_MAP_ENABLE
+
+// "Custom encoder lite" support
+void encoder_driver_init(void);
+void encoder_driver_task(void);
+
+#endif // ENCODER_ENABLE

quantum/encoder/tests/config_encoder_common.h

@@ -0,0 +1,6 @@
+// Copyright 2023 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+// Override the one in quantum/util because it doesn't like working on x64 builds.
+#define ARRAY_SIZE(array) (sizeof((array)) / sizeof((array)[0]))

quantum/encoder/tests/config_mock.h

@@ -1,6 +1,7 @@
-// Copyright 2022 Nick Brassel (@tzarc)
+// Copyright 2022-2023 Nick Brassel (@tzarc)
 // SPDX-License-Identifier: GPL-2.0-or-later
 #pragma once
+#include "config_encoder_common.h"
 
 #define MATRIX_ROWS 1
 #define MATRIX_COLS 1

quantum/encoder/tests/config_mock_split_left_eq_right.h

@@ -1,6 +1,7 @@
-// Copyright 2022 Nick Brassel (@tzarc)
+// Copyright 2022-2023 Nick Brassel (@tzarc)
 // SPDX-License-Identifier: GPL-2.0-or-later
 #pragma once
+#include "config_encoder_common.h"
 
 #define MATRIX_ROWS 1
 #define MATRIX_COLS 1

quantum/encoder/tests/config_mock_split_left_gt_right.h

@@ -1,6 +1,7 @@
-// Copyright 2022 Nick Brassel (@tzarc)
+// Copyright 2022-2023 Nick Brassel (@tzarc)
 // SPDX-License-Identifier: GPL-2.0-or-later
 #pragma once
+#include "config_encoder_common.h"
 
 #define MATRIX_ROWS 1
 #define MATRIX_COLS 1

quantum/encoder/tests/config_mock_split_left_lt_right.h

@@ -1,6 +1,7 @@
-// Copyright 2022 Nick Brassel (@tzarc)
+// Copyright 2022-2023 Nick Brassel (@tzarc)
 // SPDX-License-Identifier: GPL-2.0-or-later
 #pragma once
+#include "config_encoder_common.h"
 
 #define MATRIX_ROWS 1
 #define MATRIX_COLS 1

quantum/encoder/tests/config_mock_split_no_left.h

@@ -1,6 +1,7 @@
-// Copyright 2022 Nick Brassel (@tzarc)
+// Copyright 2022-2023 Nick Brassel (@tzarc)
 // SPDX-License-Identifier: GPL-2.0-or-later
 #pragma once
+#include "config_encoder_common.h"
 
 #define MATRIX_ROWS 1
 #define MATRIX_COLS 1

quantum/encoder/tests/config_mock_split_no_right.h

@@ -1,6 +1,7 @@
-// Copyright 2022 Nick Brassel (@tzarc)
+// Copyright 2022-2023 Nick Brassel (@tzarc)
 // SPDX-License-Identifier: GPL-2.0-or-later
 #pragma once
+#include "config_encoder_common.h"
 
 #define MATRIX_ROWS 1
 #define MATRIX_COLS 1

quantum/encoder/tests/config_mock_split_role.h

@@ -1,6 +1,7 @@
-// Copyright 2022 Nick Brassel (@tzarc)
+// Copyright 2022-2023 Nick Brassel (@tzarc)
 // SPDX-License-Identifier: GPL-2.0-or-later
 #pragma once
+#include "config_encoder_common.h"
 
 #define MATRIX_ROWS 1
 #define MATRIX_COLS 1

quantum/encoder/tests/encoder_tests.cpp

@@ -41,7 +41,7 @@ bool encoder_update_kb(uint8_t index, bool clockwise) {
 
 bool setAndRead(pin_t pin, bool val) {
     setPin(pin, val);
-    return encoder_read();
+    return encoder_task();
 }
 
 class EncoderTest : public ::testing::Test {};

quantum/encoder/tests/encoder_tests_split_left_eq_right.cpp

@@ -33,22 +33,29 @@ struct update {
 uint8_t updates_array_idx = 0;
 update  updates[32];
 
+bool isMaster;
 bool isLeftHand;
 
+extern "C" {
+bool is_keyboard_master(void) {
+    return isMaster;
+}
+
 bool encoder_update_kb(uint8_t index, bool clockwise) {
-    if (!isLeftHand) {
+    if (!is_keyboard_master()) {
         // this method has no effect on slave half
-        printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
+        printf("ignoring update on slave (%d,%s)\n", index, clockwise ? "CW" : "CC");
         return true;
     }
     updates[updates_array_idx % 32] = {index, clockwise};
     updates_array_idx++;
     return true;
 }
+};
 
 bool setAndRead(pin_t pin, bool val) {
     setPin(pin, val);
-    return encoder_read();
+    return encoder_task();
 }
 
 class EncoderSplitTestLeftEqRight : public ::testing::Test {
@@ -63,6 +70,7 @@ class EncoderSplitTestLeftEqRight : public ::testing::Test {
 };
 
 TEST_F(EncoderSplitTestLeftEqRight, TestInitLeft) {
+    isMaster   = true;
     isLeftHand = true;
     encoder_init();
     EXPECT_EQ(pinIsInputHigh[0], true);
@@ -77,6 +85,7 @@ TEST_F(EncoderSplitTestLeftEqRight, TestInitLeft) {
 }
 
 TEST_F(EncoderSplitTestLeftEqRight, TestInitRight) {
+    isMaster   = true;
     isLeftHand = false;
     encoder_init();
     EXPECT_EQ(pinIsInputHigh[0], false);
@@ -90,7 +99,8 @@ TEST_F(EncoderSplitTestLeftEqRight, TestInitRight) {
     EXPECT_EQ(updates_array_idx, 0); // no updates received
 }
 
-TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseLeft) {
+TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseLeftMaster) {
+    isMaster   = true;
     isLeftHand = true;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
@@ -102,9 +112,19 @@ TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseLeft) {
     EXPECT_EQ(updates_array_idx, 1); // one update received
     EXPECT_EQ(updates[0].index, 0);
     EXPECT_EQ(updates[0].clockwise, true);
+
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 0); // No events should be queued on master
 }
 
-TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseRightSent) {
+TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseRightMaster) {
+    isMaster   = true;
     isLeftHand = false;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
@@ -113,23 +133,60 @@ TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseRightSent) {
     setAndRead(6, true);
     setAndRead(7, true);
 
-    uint8_t slave_state[32] = {0};
-    encoder_state_raw(slave_state);
+    EXPECT_EQ(updates_array_idx, 1); // one update received
+    EXPECT_EQ(updates[0].index, 3);
+    EXPECT_EQ(updates[0].clockwise, true);
 
-    EXPECT_EQ(slave_state[0], 0);
-    EXPECT_EQ(slave_state[1], 0xFF);
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 0); // No events should be queued on master
 }
 
-TEST_F(EncoderSplitTestLeftEqRight, TestMultipleEncodersRightReceived) {
+TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseLeftSlave) {
+    isMaster   = false;
     isLeftHand = true;
     encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(0, false);
+    setAndRead(1, false);
+    setAndRead(0, true);
+    setAndRead(1, true);
 
-    uint8_t slave_state[32] = {1, 0xFF}; // First right encoder is CCW, Second right encoder CW
-    encoder_update_raw(slave_state);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
 
-    EXPECT_EQ(updates_array_idx, 2); // two updates received, one for each changed item on the right side
-    EXPECT_EQ(updates[0].index, 2);
-    EXPECT_EQ(updates[0].clockwise, false);
-    EXPECT_EQ(updates[1].index, 3);
-    EXPECT_EQ(updates[1].clockwise, true);
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 1); // One event should be queued on slave
+}
+
+TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseRightSlave) {
+    isMaster   = false;
+    isLeftHand = false;
+    encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(6, false);
+    setAndRead(7, false);
+    setAndRead(6, true);
+    setAndRead(7, true);
+
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 1); // One event should be queued on slave
 }

quantum/encoder/tests/encoder_tests_split_left_gt_right.cpp

@@ -33,22 +33,29 @@ struct update {
 uint8_t updates_array_idx = 0;
 update  updates[32];
 
+bool isMaster;
 bool isLeftHand;
 
+extern "C" {
+bool is_keyboard_master(void) {
+    return isMaster;
+}
+
 bool encoder_update_kb(uint8_t index, bool clockwise) {
-    if (!isLeftHand) {
+    if (!is_keyboard_master()) {
         // this method has no effect on slave half
-        printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
+        printf("ignoring update on slave (%d,%s)\n", index, clockwise ? "CW" : "CC");
         return true;
     }
     updates[updates_array_idx % 32] = {index, clockwise};
     updates_array_idx++;
     return true;
 }
+};
 
 bool setAndRead(pin_t pin, bool val) {
     setPin(pin, val);
-    return encoder_read();
+    return encoder_task();
 }
 
 class EncoderSplitTestLeftGreaterThanRight : public ::testing::Test {
@@ -94,7 +101,8 @@ TEST_F(EncoderSplitTestLeftGreaterThanRight, TestInitRight) {
     EXPECT_EQ(updates_array_idx, 0); // no updates received
 }
 
-TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseLeft) {
+TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseLeftMaster) {
+    isMaster   = true;
     isLeftHand = true;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
@@ -106,9 +114,19 @@ TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseLeft) {
     EXPECT_EQ(updates_array_idx, 1); // one update received
     EXPECT_EQ(updates[0].index, 0);
     EXPECT_EQ(updates[0].clockwise, true);
+
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 0); // No events should be queued on master
 }
 
-TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseRightSent) {
+TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseRightMaster) {
+    isMaster   = true;
     isLeftHand = false;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
@@ -117,23 +135,60 @@ TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseRightSent) {
     setAndRead(6, true);
     setAndRead(7, true);
 
-    uint8_t slave_state[32] = {0};
-    encoder_state_raw(slave_state);
+    EXPECT_EQ(updates_array_idx, 1); // one update received
+    EXPECT_EQ(updates[0].index, 3);
+    EXPECT_EQ(updates[0].clockwise, true);
 
-    EXPECT_EQ(slave_state[0], 0xFF);
-    EXPECT_EQ(slave_state[1], 0);
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 0); // No events should be queued on master
 }
 
-TEST_F(EncoderSplitTestLeftGreaterThanRight, TestMultipleEncodersRightReceived) {
+TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseLeftSlave) {
+    isMaster   = false;
     isLeftHand = true;
     encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(0, false);
+    setAndRead(1, false);
+    setAndRead(0, true);
+    setAndRead(1, true);
 
-    uint8_t slave_state[32] = {1, 0xFF}; // First right encoder is CCW, Second right encoder no change, third right encoder CW
-    encoder_update_raw(slave_state);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
 
-    EXPECT_EQ(updates_array_idx, 2); // two updates received, one for each changed item on the right side
-    EXPECT_EQ(updates[0].index, 3);
-    EXPECT_EQ(updates[0].clockwise, false);
-    EXPECT_EQ(updates[1].index, 4);
-    EXPECT_EQ(updates[1].clockwise, true);
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 1); // One event should be queued on slave
+}
+
+TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseRightSlave) {
+    isMaster   = false;
+    isLeftHand = false;
+    encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(6, false);
+    setAndRead(7, false);
+    setAndRead(6, true);
+    setAndRead(7, true);
+
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 1); // One event should be queued on slave
 }

quantum/encoder/tests/encoder_tests_split_left_lt_right.cpp

@@ -33,22 +33,29 @@ struct update {
 uint8_t updates_array_idx = 0;
 update  updates[32];
 
+bool isMaster;
 bool isLeftHand;
 
+extern "C" {
+bool is_keyboard_master(void) {
+    return isMaster;
+}
+
 bool encoder_update_kb(uint8_t index, bool clockwise) {
-    if (!isLeftHand) {
+    if (!is_keyboard_master()) {
         // this method has no effect on slave half
-        printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
+        printf("ignoring update on slave (%d,%s)\n", index, clockwise ? "CW" : "CC");
         return true;
     }
     updates[updates_array_idx % 32] = {index, clockwise};
     updates_array_idx++;
     return true;
 }
+};
 
 bool setAndRead(pin_t pin, bool val) {
     setPin(pin, val);
-    return encoder_read();
+    return encoder_task();
 }
 
 class EncoderSplitTestLeftLessThanRight : public ::testing::Test {
@@ -94,7 +101,8 @@ TEST_F(EncoderSplitTestLeftLessThanRight, TestInitRight) {
     EXPECT_EQ(updates_array_idx, 0); // no updates received
 }
 
-TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseLeft) {
+TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseLeftMaster) {
+    isMaster   = true;
     isLeftHand = true;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
@@ -106,9 +114,19 @@ TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseLeft) {
     EXPECT_EQ(updates_array_idx, 1); // one update received
     EXPECT_EQ(updates[0].index, 0);
     EXPECT_EQ(updates[0].clockwise, true);
+
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 0); // No events should be queued on master
 }
 
-TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseRightSent) {
+TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseRightMaster) {
+    isMaster   = true;
     isLeftHand = false;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
@@ -117,23 +135,60 @@ TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseRightSent) {
     setAndRead(6, true);
     setAndRead(7, true);
 
-    uint8_t slave_state[32] = {0};
-    encoder_state_raw(slave_state);
+    EXPECT_EQ(updates_array_idx, 1); // one update received
+    EXPECT_EQ(updates[0].index, 3);
+    EXPECT_EQ(updates[0].clockwise, true);
 
-    EXPECT_EQ(slave_state[0], 0);
-    EXPECT_EQ(slave_state[1], 0xFF);
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 0); // No events should be queued on master
 }
 
-TEST_F(EncoderSplitTestLeftLessThanRight, TestMultipleEncodersRightReceived) {
+TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseLeftSlave) {
+    isMaster   = false;
     isLeftHand = true;
     encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(0, false);
+    setAndRead(1, false);
+    setAndRead(0, true);
+    setAndRead(1, true);
 
-    uint8_t slave_state[32] = {1, 0, 0xFF}; // First right encoder is CCW, Second right encoder no change, third right encoder CW
-    encoder_update_raw(slave_state);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
 
-    EXPECT_EQ(updates_array_idx, 2); // two updates received, one for each changed item on the right side
-    EXPECT_EQ(updates[0].index, 2);
-    EXPECT_EQ(updates[0].clockwise, false);
-    EXPECT_EQ(updates[1].index, 4);
-    EXPECT_EQ(updates[1].clockwise, true);
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 1); // One event should be queued on slave
+}
+
+TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseRightSlave) {
+    isMaster   = false;
+    isLeftHand = false;
+    encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(6, false);
+    setAndRead(7, false);
+    setAndRead(6, true);
+    setAndRead(7, true);
+
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 1); // One event should be queued on slave
 }

quantum/encoder/tests/encoder_tests_split_no_left.cpp

@@ -33,22 +33,29 @@ struct update {
 uint8_t updates_array_idx = 0;
 update  updates[32];
 
+bool isMaster;
 bool isLeftHand;
 
+extern "C" {
+bool is_keyboard_master(void) {
+    return isMaster;
+}
+
 bool encoder_update_kb(uint8_t index, bool clockwise) {
-    if (!isLeftHand) {
+    if (!is_keyboard_master()) {
         // this method has no effect on slave half
-        printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
+        printf("ignoring update on slave (%d,%s)\n", index, clockwise ? "CW" : "CC");
         return true;
     }
     updates[updates_array_idx % 32] = {index, clockwise};
     updates_array_idx++;
     return true;
 }
+};
 
 bool setAndRead(pin_t pin, bool val) {
     setPin(pin, val);
-    return encoder_read();
+    return encoder_task();
 }
 
 class EncoderSplitTestNoLeft : public ::testing::Test {
@@ -82,19 +89,8 @@ TEST_F(EncoderSplitTestNoLeft, TestInitRight) {
     EXPECT_EQ(updates_array_idx, 0); // no updates received
 }
 
-TEST_F(EncoderSplitTestNoLeft, TestOneClockwiseLeft) {
-    isLeftHand = true;
-    encoder_init();
-    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
-    setAndRead(0, false);
-    setAndRead(1, false);
-    setAndRead(0, true);
-    setAndRead(1, true);
-
-    EXPECT_EQ(updates_array_idx, 0); // no updates received
-}
-
-TEST_F(EncoderSplitTestNoLeft, TestOneClockwiseRightSent) {
+TEST_F(EncoderSplitTestNoLeft, TestOneClockwiseLeftMaster) {
+    isMaster   = true;
     isLeftHand = false;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
@@ -103,23 +99,38 @@ TEST_F(EncoderSplitTestNoLeft, TestOneClockwiseRightSent) {
     setAndRead(2, true);
     setAndRead(3, true);
 
-    uint8_t slave_state[32] = {0};
-    encoder_state_raw(slave_state);
+    EXPECT_EQ(updates_array_idx, 1); // one update received
+    EXPECT_EQ(updates[0].index, 1);
+    EXPECT_EQ(updates[0].clockwise, true);
 
-    EXPECT_EQ(slave_state[0], 0);
-    EXPECT_EQ(slave_state[1], 0xFF);
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 0); // No events should be queued on master
 }
 
-TEST_F(EncoderSplitTestNoLeft, TestMultipleEncodersRightReceived) {
-    isLeftHand = true;
+TEST_F(EncoderSplitTestNoLeft, TestOneClockwiseRightSlave) {
+    isMaster   = false;
+    isLeftHand = false;
     encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(2, false);
+    setAndRead(3, false);
+    setAndRead(2, true);
+    setAndRead(3, true);
 
-    uint8_t slave_state[32] = {1, 0xFF}; // First right encoder is CCW, Second right encoder no change, third right encoder CW
-    encoder_update_raw(slave_state);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
 
-    EXPECT_EQ(updates_array_idx, 2); // two updates received, one for each changed item on the right side
-    EXPECT_EQ(updates[0].index, 0);
-    EXPECT_EQ(updates[0].clockwise, false);
-    EXPECT_EQ(updates[1].index, 1);
-    EXPECT_EQ(updates[1].clockwise, true);
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 1); // One event should be queued on slave
 }

quantum/encoder/tests/encoder_tests_split_no_right.cpp

@@ -33,22 +33,29 @@ struct update {
 uint8_t updates_array_idx = 0;
 update  updates[32];
 
+bool isMaster;
 bool isLeftHand;
 
+extern "C" {
+bool is_keyboard_master(void) {
+    return isMaster;
+}
+
 bool encoder_update_kb(uint8_t index, bool clockwise) {
-    if (!isLeftHand) {
+    if (!is_keyboard_master()) {
         // this method has no effect on slave half
-        printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
+        printf("ignoring update on slave (%d,%s)\n", index, clockwise ? "CW" : "CC");
         return true;
     }
     updates[updates_array_idx % 32] = {index, clockwise};
     updates_array_idx++;
     return true;
 }
+};
 
 bool setAndRead(pin_t pin, bool val) {
     setPin(pin, val);
-    return encoder_read();
+    return encoder_task();
 }
 
 class EncoderSplitTestNoRight : public ::testing::Test {
@@ -82,37 +89,48 @@ TEST_F(EncoderSplitTestNoRight, TestInitRight) {
     EXPECT_EQ(updates_array_idx, 0); // no updates received
 }
 
-TEST_F(EncoderSplitTestNoRight, TestOneClockwiseLeft) {
+TEST_F(EncoderSplitTestNoRight, TestOneClockwiseLeftMaster) {
+    isMaster   = true;
     isLeftHand = true;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
-    setAndRead(0, false);
-    setAndRead(1, false);
-    setAndRead(0, true);
-    setAndRead(1, true);
+    setAndRead(2, false);
+    setAndRead(3, false);
+    setAndRead(2, true);
+    setAndRead(3, true);
 
-    EXPECT_EQ(updates_array_idx, 1); // one updates received
-    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates_array_idx, 1); // one update received
+    EXPECT_EQ(updates[0].index, 1);
     EXPECT_EQ(updates[0].clockwise, true);
-}
 
-TEST_F(EncoderSplitTestNoRight, TestOneClockwiseRightSent) {
-    isLeftHand = false;
-    encoder_init();
-
-    uint8_t slave_state[32] = {0xAA, 0xAA};
-    encoder_state_raw(slave_state);
-
-    EXPECT_EQ(slave_state[0], 0xAA);
-    EXPECT_EQ(slave_state[1], 0xAA);
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 0); // No events should be queued on master
 }
 
-TEST_F(EncoderSplitTestNoRight, TestMultipleEncodersRightReceived) {
+TEST_F(EncoderSplitTestNoRight, TestOneClockwiseRightSlave) {
+    isMaster   = false;
     isLeftHand = true;
     encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(2, false);
+    setAndRead(3, false);
+    setAndRead(2, true);
+    setAndRead(3, true);
 
-    uint8_t slave_state[32] = {1, 0xFF}; // These values would trigger updates if there were encoders on the other side
-    encoder_update_raw(slave_state);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
 
-    EXPECT_EQ(updates_array_idx, 0); // no updates received -- no right-hand encoders
+    int              events_queued = 0;
+    encoder_events_t events;
+    encoder_retrieve_events(&events);
+    while (events.tail != events.head) {
+        events.tail = (events.tail + 1) % MAX_QUEUED_ENCODER_EVENTS;
+        ++events_queued;
+    }
+    EXPECT_EQ(events_queued, 1); // One event should be queued on slave
 }

quantum/encoder/tests/encoder_tests_split_role.cpp

@@ -50,7 +50,7 @@ bool encoder_update_kb(uint8_t index, bool clockwise) {
 
 bool setAndRead(pin_t pin, bool val) {
     setPin(pin, val);
-    return encoder_read();
+    return encoder_task();
 }
 
 class EncoderSplitTestRole : public ::testing::Test {
@@ -87,9 +87,6 @@ TEST_F(EncoderSplitTestRole, TestPrimaryRight) {
     setAndRead(6, true);
     setAndRead(7, true);
 
-    uint8_t slave_state[32] = {0};
-    encoder_state_raw(slave_state);
-
     EXPECT_EQ(num_updates, 1); // one update received
 }
 
@@ -116,8 +113,5 @@ TEST_F(EncoderSplitTestRole, TestNotPrimaryRight) {
     setAndRead(6, true);
     setAndRead(7, true);
 
-    uint8_t slave_state[32] = {0};
-    encoder_state_raw(slave_state);
-
     EXPECT_EQ(num_updates, 0); // zero updates received
 }

quantum/encoder/tests/mock_split.c

@@ -36,7 +36,3 @@ bool setPin(pin_t pin, bool val) {
 }
 
 void last_encoder_activity_trigger(void) {}
-
-__attribute__((weak)) bool is_keyboard_master(void) {
-    return true;
-}

quantum/encoder/tests/mock_split.h

@@ -22,9 +22,6 @@
 #define SPLIT_KEYBOARD
 typedef uint8_t pin_t;
 
-void encoder_state_raw(uint8_t* slave_state);
-void encoder_update_raw(uint8_t* slave_state);
-
 extern bool pins[];
 extern bool pinIsInputHigh[];
 

quantum/encoder/tests/rules.mk

@@ -3,6 +3,7 @@ encoder_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock.h
 
 encoder_SRC := \
 	platforms/test/timer.c \
+	drivers/encoder/encoder_quadrature.c \
 	$(QUANTUM_PATH)/encoder/tests/mock.c \
 	$(QUANTUM_PATH)/encoder/tests/encoder_tests.cpp \
 	$(QUANTUM_PATH)/encoder.c
@@ -13,6 +14,7 @@ encoder_split_left_eq_right_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_
 
 encoder_split_left_eq_right_SRC := \
 	platforms/test/timer.c \
+	drivers/encoder/encoder_quadrature.c \
 	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
 	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_left_eq_right.cpp \
 	$(QUANTUM_PATH)/encoder.c
@@ -23,6 +25,7 @@ encoder_split_left_gt_right_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_
 
 encoder_split_left_gt_right_SRC := \
 	platforms/test/timer.c \
+	drivers/encoder/encoder_quadrature.c \
 	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
 	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_left_gt_right.cpp \
 	$(QUANTUM_PATH)/encoder.c
@@ -33,6 +36,7 @@ encoder_split_left_lt_right_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_
 
 encoder_split_left_lt_right_SRC := \
 	platforms/test/timer.c \
+	drivers/encoder/encoder_quadrature.c \
 	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
 	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_left_lt_right.cpp \
 	$(QUANTUM_PATH)/encoder.c
@@ -43,6 +47,7 @@ encoder_split_no_left_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_split_
 
 encoder_split_no_left_SRC := \
 	platforms/test/timer.c \
+	drivers/encoder/encoder_quadrature.c \
 	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
 	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_no_left.cpp \
 	$(QUANTUM_PATH)/encoder.c
@@ -53,6 +58,7 @@ encoder_split_no_right_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_split
 
 encoder_split_no_right_SRC := \
 	platforms/test/timer.c \
+	drivers/encoder/encoder_quadrature.c \
 	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
 	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_no_right.cpp \
 	$(QUANTUM_PATH)/encoder.c
@@ -63,6 +69,7 @@ encoder_split_role_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_split_rol
 
 encoder_split_role_SRC := \
 	platforms/test/timer.c \
+	drivers/encoder/encoder_quadrature.c \
 	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
 	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_role.cpp \
 	$(QUANTUM_PATH)/encoder.c

quantum/keyboard.c

@@ -689,7 +689,7 @@ void keyboard_task(void) {
 #endif
 
 #ifdef ENCODER_ENABLE
-    if (encoder_read()) {
+    if (encoder_task()) {
         last_encoder_activity_trigger();
         activity_has_occurred = true;
     }

quantum/split_common/transaction_id_define.h

@@ -31,6 +31,7 @@ enum serial_transaction_id {
 #ifdef ENCODER_ENABLE
     GET_ENCODERS_CHECKSUM,
     GET_ENCODERS_DATA,
+    PUT_ENCODER_TAIL,
 #endif // ENCODER_ENABLE
 
 #ifndef DISABLE_SYNC_TIMER

quantum/split_common/transactions.c

@@ -234,21 +234,28 @@ static void master_matrix_handlers_slave(matrix_row_t master_matrix[], matrix_ro
 #ifdef ENCODER_ENABLE
 
 static bool encoder_handlers_master(matrix_row_t master_matrix[], matrix_row_t slave_matrix[]) {
-    static uint32_t last_update = 0;
-    uint8_t         temp_state[NUM_ENCODERS_MAX_PER_SIDE];
+    static uint32_t  last_update = 0;
+    encoder_events_t temp_events;
 
-    bool okay = read_if_checksum_mismatch(GET_ENCODERS_CHECKSUM, GET_ENCODERS_DATA, &last_update, temp_state, split_shmem->encoders.state, sizeof(temp_state));
-    if (okay) encoder_update_raw(temp_state);
+    bool okay = read_if_checksum_mismatch(GET_ENCODERS_CHECKSUM, GET_ENCODERS_DATA, &last_update, &temp_events, &split_shmem->encoders.events, sizeof(temp_events));
+    if (okay) {
+        encoder_handle_slave_events(&split_shmem->encoders.events);
+        transport_write(PUT_ENCODER_TAIL, &split_shmem->encoders.events.tail, sizeof(split_shmem->encoders.events.tail));
+        split_shmem->encoders.checksum = crc8(&split_shmem->encoders.events, sizeof(split_shmem->encoders.events));
+    }
     return okay;
 }
 
 static void encoder_handlers_slave(matrix_row_t master_matrix[], matrix_row_t slave_matrix[]) {
-    uint8_t encoder_state[NUM_ENCODERS_MAX_PER_SIDE];
-    encoder_state_raw(encoder_state);
     // Always prepare the encoder state for read.
-    memcpy(split_shmem->encoders.state, encoder_state, sizeof(encoder_state));
+    encoder_retrieve_events(&split_shmem->encoders.events);
     // Now update the checksum given that the encoders has been written to
-    split_shmem->encoders.checksum = crc8(encoder_state, sizeof(encoder_state));
+    split_shmem->encoders.checksum = crc8(&split_shmem->encoders.events, sizeof(split_shmem->encoders.events));
+}
+
+static void encoder_handlers_slave_reset(uint8_t initiator2target_buffer_size, const void *initiator2target_buffer, uint8_t target2initiator_buffer_size, void *target2initiator_buffer) {
+    uint8_t tail_index = *(uint8_t *)initiator2target_buffer;
+    encoder_set_tail_index(tail_index);
 }
 
 // clang-format off
@@ -256,7 +263,8 @@ static void encoder_handlers_slave(matrix_row_t master_matrix[], matrix_row_t sl
 #    define TRANSACTIONS_ENCODERS_SLAVE() TRANSACTION_HANDLER_SLAVE_AUTOLOCK(encoder)
 #    define TRANSACTIONS_ENCODERS_REGISTRATIONS \
     [GET_ENCODERS_CHECKSUM] = trans_target2initiator_initializer(encoders.checksum), \
-    [GET_ENCODERS_DATA]     = trans_target2initiator_initializer(encoders.state),
+    [GET_ENCODERS_DATA]     = trans_target2initiator_initializer(encoders.events), \
+    [PUT_ENCODER_TAIL]      = trans_initiator2target_initializer_cb(encoders.events.tail, encoder_handlers_slave_reset),
 // clang-format on
 
 #else // ENCODER_ENABLE

quantum/split_common/transport.h

@@ -65,8 +65,8 @@ typedef struct _split_master_matrix_sync_t {
 
 #ifdef ENCODER_ENABLE
 typedef struct _split_slave_encoder_sync_t {
-    uint8_t checksum;
-    uint8_t state[NUM_ENCODERS_MAX_PER_SIDE];
+    uint8_t          checksum;
+    encoder_events_t events;
 } split_slave_encoder_sync_t;
 #endif // ENCODER_ENABLE