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diff --git a/keyboards/kmac_pad/matrix.c b/keyboards/kmac_pad/matrix.c
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+/*
+Copyright 2021 talsu <talsu84@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/>.
+*/
+
+#include "wait.h"
+#include "matrix.h"
+#include "quantum.h"
+
+static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
+
+/* Columns 0 - 3
+ * col / pin:
+ * 0: C7
+ * 1: C6
+ * 2: B6
+ * 3: B5
+ */
+static void unselect_cols(void) {
+ for (uint8_t col = 0; col < MATRIX_COLS; col++) {
+ setPinOutput(col_pins[col]);
+ writePinLow(col_pins[col]);
+ }
+}
+
+static void select_col(uint8_t col) {
+ writePinHigh(col_pins[col]);
+}
+
+static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
+ bool matrix_changed = false;
+
+ // Select col and wait for col selecton to stabilize
+ select_col(current_col);
+ wait_us(30);
+
+ // row:0 , col:0 FN key is DIRECT_PIN
+ if (current_col == 0) {
+
+ matrix_row_t last_row_value = current_matrix[0];
+ if (readPin(row_pins[0]) == 0) {
+ // Pin LO, set col bit
+ current_matrix[0] |= (1 << current_col);
+ } else {
+ // Pin HI, clear col bit
+ current_matrix[0] &= ~(1 << current_col);
+ }
+
+ // Determine if the matrix changed state
+ if ((last_row_value != current_matrix[0]) && !(matrix_changed)) {
+ matrix_changed = true;
+ }
+ }
+
+ // other row use MATRIX
+ for (uint8_t row_index = 1; row_index < MATRIX_ROWS; row_index++) {
+
+ matrix_row_t last_row_value = current_matrix[row_index];
+ if (readPin(row_pins[row_index]) == 0) {
+ // Pin HI, clear col bit
+ current_matrix[row_index] &= ~(1 << current_col);
+ } else {
+ // Pin LO, set col bit
+ current_matrix[row_index] |= (1 << current_col);
+ }
+
+ // Determine if the matrix changed state
+ if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) {
+ matrix_changed = true;
+ }
+ }
+
+
+ // Unselect cols
+ unselect_cols();
+
+ return matrix_changed;
+}
+
+void matrix_init_custom(void) {
+ // initialize hardware and global matrix state here
+ unselect_cols();
+
+ // initialize key pins
+ for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
+ setPinInputHigh(row_pins[row_index]);
+ }
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+ bool changed = false;
+
+ for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
+ changed |= read_rows_on_col(current_matrix, current_col);
+ }
+
+ return changed;
+}