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+/*
+Copyright 2012-2020 Jun Wako, Jack Humbert, Yiancar, Takeshi Nishio
+
+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 <stdint.h>
+#include <stdbool.h>
+#include "matrix.h"
+#include "quantum.h"
+
+#define ROW_SHIFTER ((uint16_t)1)
+
+static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
+
+static void select_row(uint8_t row) {
+ setPinOutput(row_pins[row]);
+ writePinLow(row_pins[row]);
+}
+
+static void unselect_row(uint8_t row) {
+ setPinInputHigh(row_pins[row]);
+}
+
+static void unselect_rows(void) {
+ for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
+ setPinInputHigh(row_pins[x]);
+ }
+}
+
+static void init_pins(void) {
+ unselect_rows();
+ for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+ setPinInputHigh(col_pins[x]);
+ }
+}
+
+static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
+ // Store last value of row prior to reading
+ matrix_row_t last_row_value = current_matrix[current_row];
+
+ // Clear data in matrix row
+ current_matrix[current_row] = 0;
+
+ // Select row and wait for row selecton to stabilize
+ select_row(current_row);
+ matrix_io_delay();
+
+ // For each col...
+ for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
+
+ // skip reading when index equals (= pin itself)
+ if (col_index != current_row) {
+ // Check col pin pin_state
+ if (readPin(col_pins[col_index]) == 0) {
+ // Pin LO, set col bit
+ current_matrix[current_row] |= (ROW_SHIFTER << col_index);
+ } else {
+ // Pin HI, clear col bit
+ current_matrix[current_row] &= ~(ROW_SHIFTER << col_index);
+ }
+ }
+ }
+
+ // Unselect row
+ unselect_row(current_row);
+
+ return (last_row_value != current_matrix[current_row]);
+}
+
+void matrix_init_custom(void) {
+ // initialize key pins
+ init_pins();
+
+ matrix_init_quantum();
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+ bool changed = false;
+
+ // Set row, read cols
+ for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+ changed |= read_cols_on_row(current_matrix, current_row);
+ }
+
+ matrix_scan_quantum();
+ return changed;
+}