/* Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar 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" #if (MATRIX_COLS <= 8) # define ROW_SHIFTER ((uint8_t)1) #elif (MATRIX_COLS <= 16) # define ROW_SHIFTER ((uint16_t)1) #elif (MATRIX_COLS <= 32) # define ROW_SHIFTER ((uint32_t)1) #endif 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 select_col(uint8_t col) { setPinOutput(col_pins[col]); writePinLow(col_pins[col]); } static void unselect_col(uint8_t col) { setPinInputHigh(col_pins[col]); } static void unselect_cols(void) { for (uint8_t x = 0; x < MATRIX_COLS; x++) { setPinInputHigh(col_pins[x]); } } static void init_pins(void) { unselect_rows(); unselect_cols(); for (uint8_t x = 0; x < MATRIX_COLS; x++) { setPinInputHigh(col_pins[x]); } for (uint8_t x = 0; x < MATRIX_ROWS; x++) { setPinInputHigh(row_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++) { // Select the col pin to read (active low) uint8_t pin_state = readPin(col_pins[col_index]); // Populate the matrix row with the state of the col pin current_matrix[current_row] |= pin_state ? 0 : (ROW_SHIFTER << col_index); } // Unselect row unselect_row(current_row); return (last_row_value != current_matrix[current_row]); } 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); matrix_io_delay(); // For each row... for(uint8_t row_index = 0; row_index < MATRIX_ROWS / 2; row_index++) { uint8_t tmp = row_index + MATRIX_ROWS / 2; // Store last value of row prior to reading matrix_row_t last_row_value = current_matrix[tmp]; // Check row pin state if (readPin(row_pins[row_index]) == 0) { // Pin LO, set col bit current_matrix[tmp] |= (ROW_SHIFTER << current_col); } else { // Pin HI, clear col bit current_matrix[tmp] &= ~(ROW_SHIFTER << current_col); } // Determine if the matrix changed state if ((last_row_value != current_matrix[tmp]) && !(matrix_changed)) { matrix_changed = true; } } // Unselect col unselect_col(current_col); return matrix_changed; } void matrix_init_custom(void) { // initialize key pins init_pins(); } 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 / 2; current_row++) { changed |= read_cols_on_row(current_matrix, current_row); } // Set col, read rows for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) { changed |= read_rows_on_col(current_matrix, current_col); } return changed; }