From e702c7f1b4cfa8fe1579498ef2877994baa64056 Mon Sep 17 00:00:00 2001
From: Nick Brassel <nick@tzarc.org>
Date: Mon, 18 Jan 2021 05:01:38 +1100
Subject: Keep track of last matrix activity. (#11552)

Co-authored-by: Dasky <daskygit@users.noreply.github.com>

Co-authored-by: Dasky <daskygit@users.noreply.github.com>
---
 quantum/split_common/matrix.c | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

(limited to 'quantum/split_common')

diff --git a/quantum/split_common/matrix.c b/quantum/split_common/matrix.c
index 22ff89bfc6..631e960ead 100644
--- a/quantum/split_common/matrix.c
+++ b/quantum/split_common/matrix.c
@@ -251,21 +251,33 @@ void matrix_init(void) {
     split_post_init();
 }
 
-void matrix_post_scan(void) {
+bool matrix_post_scan(void) {
+    bool changed = false;
     if (is_keyboard_master()) {
         static uint8_t error_count;
 
-        if (!transport_master(matrix + thatHand)) {
+        matrix_row_t slave_matrix[ROWS_PER_HAND] = {0};
+        if (!transport_master(slave_matrix)) {
             error_count++;
 
             if (error_count > ERROR_DISCONNECT_COUNT) {
                 // reset other half if disconnected
                 for (int i = 0; i < ROWS_PER_HAND; ++i) {
                     matrix[thatHand + i] = 0;
+                    slave_matrix[i] = 0;
                 }
+
+                changed = true;
             }
         } else {
             error_count = 0;
+
+            for (int i = 0; i < ROWS_PER_HAND; ++i) {
+                if (matrix[thatHand + i] != slave_matrix[i]) {
+                    matrix[thatHand + i] = slave_matrix[i];
+                    changed              = true;
+                }
+            }
         }
 
         matrix_scan_quantum();
@@ -274,25 +286,27 @@ void matrix_post_scan(void) {
 
         matrix_slave_scan_user();
     }
+
+    return changed;
 }
 
 uint8_t matrix_scan(void) {
-    bool changed = false;
+    bool local_changed = false;
 
 #if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW)
     // Set row, read cols
     for (uint8_t current_row = 0; current_row < ROWS_PER_HAND; current_row++) {
-        changed |= read_cols_on_row(raw_matrix, current_row);
+        local_changed |= read_cols_on_row(raw_matrix, current_row);
     }
 #elif (DIODE_DIRECTION == ROW2COL)
     // Set col, read rows
     for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
-        changed |= read_rows_on_col(raw_matrix, current_col);
+        local_changed |= read_rows_on_col(raw_matrix, current_col);
     }
 #endif
 
-    debounce(raw_matrix, matrix + thisHand, ROWS_PER_HAND, changed);
+    debounce(raw_matrix, matrix + thisHand, ROWS_PER_HAND, local_changed);
 
-    matrix_post_scan();
-    return (uint8_t)changed;
+    bool remote_changed = matrix_post_scan();
+    return (uint8_t)(local_changed || remote_changed);
 }
-- 
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