/* 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_kb(); } 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_kb(); return changed; }