/* Copyright 2021 Matthew Dias 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 "wait.h" #include "quantum.h" #include "i2c_master.h" static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS; static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS; static void unselect_rows(void) { for(uint8_t x = 0; x < MATRIX_ROWS; x++) { setPinInputHigh(row_pins[x]); } } 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 init_pins(void) { unselect_rows(); // Set I/O uint8_t send_data[2] = { 0xFF, 0x03}; i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x00, &send_data[0], 2, 20); // Set Pull-up i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x0C, &send_data[0], 2, 20); for (uint8_t x = 0; x < MATRIX_COLS; x++) { if ( x < 8 ) { setPinInputHigh(col_pins[x]); } } } void matrix_init_custom(void) { // TODO: initialize hardware here // Initialize I2C i2c_init(); // initialize key pins init_pins(); wait_ms(50); } 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(); uint8_t port_expander_col_buffer[2]; i2c_readReg((PORT_EXPANDER_ADDRESS << 1), 0x12, &port_expander_col_buffer[0], 2, 20); // For each col... for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) { uint8_t pin_state; // Select the col pin to read (active low) switch (col_index) { case 8 : pin_state = port_expander_col_buffer[0] & (1 << 0); break; case 9 : pin_state = port_expander_col_buffer[0] & (1 << 1); break; case 10 : pin_state = port_expander_col_buffer[0] & (1 << 2); break; case 11 : pin_state = port_expander_col_buffer[0] & (1 << 3); break; case 12 : pin_state = port_expander_col_buffer[0] & (1 << 4); break; case 13 : pin_state = port_expander_col_buffer[0] & (1 << 5); break; case 14 : pin_state = port_expander_col_buffer[0] & (1 << 6); break; case 15 : pin_state = port_expander_col_buffer[0] & (1 << 7); break; case 16 : pin_state = port_expander_col_buffer[1] & (1 << 0); break; case 17 : pin_state = port_expander_col_buffer[1] & (1 << 1); break; default : 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 : (MATRIX_ROW_SHIFTER << col_index); } // Unselect row unselect_row(current_row); return (last_row_value != current_matrix[current_row]); } bool matrix_scan_custom(matrix_row_t current_matrix[]) { bool matrix_has_changed = false; // Set row, read cols for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) { matrix_has_changed |= read_cols_on_row(current_matrix, current_row); } return matrix_has_changed; }