- /*
- * Copyright 2018-2023 Jack Humbert <jack.humb@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 "matrix.h"
- #include "wait.h"
-
- /* matrix state(1:on, 0:off) */
- static pin_t matrix_row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
- static pin_t matrix_col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
-
- static matrix_row_t matrix_inverted[MATRIX_COLS];
-
- void matrix_init_custom(void) {
- // actual matrix setup - cols
- for (int i = 0; i < MATRIX_COLS; i++) {
- setPinOutput(matrix_col_pins[i]);
- writePinLow(matrix_col_pins[i]);
- }
-
- // rows
- for (int i = 0; i < MATRIX_ROWS; i++) {
- setPinInputLow(matrix_row_pins[i]);
- }
- }
-
- bool matrix_scan_custom(matrix_row_t current_matrix[]) {
- bool changed = false;
-
- // actual matrix
- for (int col = 0; col < MATRIX_COLS; col++) {
- matrix_row_t data = 0;
-
- // strobe col
- writePinHigh(matrix_col_pins[col]);
-
- // need wait to settle pin state
- wait_us(20);
-
- // read row data
- for (int row = 0; row < MATRIX_ROWS; row++) {
- data |= (readPin(matrix_row_pins[row]) << row);
- }
-
- // unstrobe col
- writePinLow(matrix_col_pins[col]);
-
- if (matrix_inverted[col] != data) {
- matrix_inverted[col] = data;
- }
- }
-
- for (int row = 0; row < MATRIX_ROWS; row++) {
- matrix_row_t old = current_matrix[row];
- current_matrix[row] = 0;
- for (int col = 0; col < MATRIX_COLS; col++) {
- current_matrix[row] |= ((matrix_inverted[col] & (1 << row) ? 1 : 0) << col);
- }
- changed |= old != current_matrix[row];
- }
-
- return changed;
- }
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