1 files changed, 111 insertions, 0 deletions

diff --git a/keyboards/kmac_pad/matrix.c b/keyboards/kmac_pad/matrix.c
new file mode 100644
index 000000000..476e40f51
--- /dev/null
+++ b/keyboards/kmac_pad/matrix.c
@@ -0,0 +1,111 @@
+/*
+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;
+}