Make debounce() signal changes in the cooked matrix as return value (#17554)

1 files changed, 9 insertions, 3 deletions

diff --git a/quantum/debounce/sym_defer_g.c b/quantum/debounce/sym_defer_g.c
index 47450992a4..d04310a761 100644
--- a/quantum/debounce/sym_defer_g.c
+++ b/quantum/debounce/sym_defer_g.c
@@ -20,6 +20,7 @@ When no state changes have occured for DEBOUNCE milliseconds, we push the state.
 #include "matrix.h"
 #include "timer.h"
 #include "quantum.h"
+#include <string.h>
 #ifndef DEBOUNCE
 #    define DEBOUNCE 5
 #endif
@@ -30,18 +31,23 @@ static fast_timer_t debouncing_time;
 
 void debounce_init(uint8_t num_rows) {}
 
-void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
+bool debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
+    bool cooked_changed = false;
+
     if (changed) {
         debouncing      = true;
         debouncing_time = timer_read_fast();
     }
 
     if (debouncing && timer_elapsed_fast(debouncing_time) >= DEBOUNCE) {
-        for (int i = 0; i < num_rows; i++) {
-            cooked[i] = raw[i];
+        if (memcmp(cooked, raw, sizeof(matrix_row_t) * num_rows) != 0) {
+            memcpy(cooked, raw, sizeof(matrix_row_t) * num_rows);
+            cooked_changed = true;
         }
         debouncing = false;
     }
+
+    return cooked_changed;
 }
 
 void debounce_free(void) {}