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- /*
- * Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
- * 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 QMK_KEYBOARD_H
- #include "mcp23018.h"
-
- #define SPLIT_MATRIX_COLS (MATRIX_COLS / 2)
- #define SECONDARY_ROW_OFFSET (MATRIX_ROWS / 2)
-
- typedef uint16_t mcp23018_pin_t;
-
- static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
- static const pin_t col_pins[SPLIT_MATRIX_COLS] = MATRIX_COL_PINS;
- static const mcp23018_pin_t secondary_row_pins[MATRIX_ROWS] = SECONDARY_ROW_PINS;
- static const mcp23018_pin_t secondary_col_pins[SPLIT_MATRIX_COLS] = SECONDARY_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_secondary_row(uint8_t row) {
- uint8_t gpioa = 0xFF & ~secondary_row_pins[row];
- mcp23018_writeReg(GPIOA, &gpioa, 1);
- }
-
- static void init_pins(void) {
- unselect_rows();
- for (uint8_t x = 0; x < SPLIT_MATRIX_COLS; x++) {
- setPinInputHigh(col_pins[x]);
- }
- }
-
- static matrix_row_t read_cols(void) {
- matrix_row_t state = 0;
-
- // For each col...
- for (uint8_t col_index = 0; col_index < SPLIT_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
- state |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
- }
-
- return state;
- }
-
- static matrix_row_t read_secondary_cols(void) {
- matrix_row_t state = 0;
-
- uint8_t mcp23018_pin_state[2];
- if (mcp23018_readReg(GPIOA, mcp23018_pin_state, 2)) {
- return 0;
- }
-
- uint16_t pins = mcp23018_pin_state[0] | (mcp23018_pin_state[1] << 8);
-
- for (uint8_t col_index = 0; col_index < SPLIT_MATRIX_COLS; col_index++) {
- uint16_t pin_state = pins & (secondary_col_pins[col_index]);
- state |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
- }
-
- return state;
- }
-
- static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
- matrix_row_t last_row_value = current_matrix[current_row];
-
- select_row(current_row);
- select_secondary_row(current_row);
-
- current_matrix[current_row] = read_cols() | (read_secondary_cols() << 6);
-
- unselect_row(current_row);
-
- return (last_row_value != current_matrix[current_row]);
- }
-
- void matrix_init_custom(void) { init_pins(); }
-
- bool matrix_scan_custom(matrix_row_t current_matrix[]) {
- bool changed = false;
-
- for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
- changed |= read_cols_on_row(current_matrix, current_row);
- }
-
- return changed;
- }
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