/* * 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; }