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- /* Copyright 2023 ebastler and elpekenin
- *
- * 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 "matrix.h"
- #include "pca9555.h"
- #include "timer.h"
-
- // PCA9555 i2c address, 0x20: A0 = 0, A1 = 0, A2 = 0
- #define IC1 0x20
-
- // Define how long to wait to reach the IO expander after connection loss again
- // Since this board is modular, it should not spam unnecessary i2c requests if used without a module
- #define RETRY_TIMESPAN 2000
-
- typedef enum {
- PLUGGED,
- DOUBTFUL,
- UNPLUGGED
- } expander_status_t;
-
- void pca9555_setup(void) {
- // Initialize the expander, no need to set ports to inputs as that is the default behavior
- pca9555_init(IC1);
- }
-
- void matrix_init_custom(void) {
- // Encoder pushbutton on the MCU is connected to PD2
- setPinInputHigh(D2);
- pca9555_setup();
- }
-
- bool matrix_scan_custom(matrix_row_t current_matrix[]) {
- static expander_status_t status = DOUBTFUL;
- static uint32_t retry_timer = 0;
-
- // initialize one byte filled with 1
- uint8_t pin_states = 0xFF;
-
-
- if (status != UNPLUGGED || timer_elapsed32(retry_timer) > RETRY_TIMESPAN) {
- // If the chip was unplugged before, it needs to be re-initialized
- if(status==UNPLUGGED) {
- pca9555_setup();
- }
- // Read the entire port into this byte, 1 = not pressed, 0 = pressed
- bool ret = pca9555_read_pins(IC1, PCA9555_PORT0, &pin_states);
-
- // Update state
- if (ret) {
- status = PLUGGED;
- } else {
- switch (status) {
- case PLUGGED:
- status = DOUBTFUL;
- break;
-
- case DOUBTFUL:
- status = UNPLUGGED;
- break;
-
- // If we've diagnosed as unplugged, update timer to not read I2C
- case UNPLUGGED:
- retry_timer = timer_read32();
- }
- }
- }
-
- // Shift pin states by 1 to make room for the switch connected to the MCU, then OR them together and invert (as QMK uses inverted logic compared to the electrical levels)
- matrix_row_t data = ~(pin_states << 1 | readPin(D2));
-
- bool changed = current_matrix[0] != data;
- current_matrix[0] = data;
-
- return changed;
- }
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