1 files changed, 52 insertions, 0 deletions

diff --git a/quantum/debounce/sym_defer_g.c b/quantum/debounce/sym_defer_g.c
new file mode 100644
index 000000000..3ed9055d2
--- /dev/null
+++ b/quantum/debounce/sym_defer_g.c
@@ -0,0 +1,52 @@
+/*
+Copyright 2017 Alex Ong<the.onga@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/>.
+*/
+
+/*
+Basic global debounce algorithm. Used in 99% of keyboards at time of implementation
+When no state changes have occured for DEBOUNCE milliseconds, we push the state.
+*/
+#include "matrix.h"
+#include "timer.h"
+#include "quantum.h"
+#ifndef DEBOUNCE
+#    define DEBOUNCE 5
+#endif
+
+void        debounce_init(uint8_t num_rows) {}
+static bool debouncing = false;
+
+#if DEBOUNCE > 0
+static uint16_t debouncing_time;
+void            debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
+    if (changed) {
+        debouncing      = true;
+        debouncing_time = timer_read();
+    }
+
+    if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
+        for (int i = 0; i < num_rows; i++) {
+            cooked[i] = raw[i];
+        }
+        debouncing = false;
+    }
+}
+#else  // no debouncing.
+void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
+    for (int i = 0; i < num_rows; i++) {
+        cooked[i] = raw[i];
+    }
+}
+#endif
+
+bool debounce_active(void) { return debouncing; }