diff options
Diffstat (limited to 'keyboards/geistmaschine/macropod/matrix.c')
| -rw-r--r-- | keyboards/geistmaschine/macropod/matrix.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/keyboards/geistmaschine/macropod/matrix.c b/keyboards/geistmaschine/macropod/matrix.c new file mode 100644 index 0000000000..60b1dafe63 --- /dev/null +++ b/keyboards/geistmaschine/macropod/matrix.c @@ -0,0 +1,87 @@ +/* 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 "pca9555.h" +#include "quantum.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_readPins(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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