3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation, either version 2 of the License, or
6 * (at your option) any later version.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 // PCA9555 slave addresses
30 //_____Utility funcs___________________________________________________________
32 static void init_pins(void) {
33 // init all cols high - IC2 all input
34 pca9555_set_config(IC2, PCA9555_PORT0, ALL_INPUT);//same as initial state
35 pca9555_set_config(IC2, PCA9555_PORT1, ALL_INPUT);//same as initial state
37 // init all rows - IC1 port0 input
38 pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT);//same as initial state
41 static void select_row(uint8_t row) {
42 // For the XD84 all rows are on the same IC and port
43 // so its safe enough to assume here row == pin
45 uint8_t mask = 1 << pin;
47 pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH & (~mask));
48 pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT & (~mask));
51 static uint16_t read_cols(void) {
52 uint16_t state_1 = pca9555_readPins(IC2, PCA9555_PORT0);
53 uint16_t state_2 = pca9555_readPins(IC2, PCA9555_PORT1);
55 // For the XD84 all cols are on the same IC and mapped sequentially
56 // while this technically gives 16 column reads,
57 // the 16th column can never be set so is safely ignored
58 return ~((state_2 << 8) | state_1);
61 static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
62 // Store last value of row prior to reading
63 matrix_row_t last_row_value = current_matrix[current_row];
65 // Clear data in matrix row
66 current_matrix[current_row] = 0;
68 // Select row and wait for row selecton to stabilize
69 select_row(current_row);
72 current_matrix[current_row] = read_cols();
74 // No need to Unselect row as the next `select_row` will blank everything
76 return (last_row_value != current_matrix[current_row]);
79 //_____CUSTOM MATRIX IMPLEMENTATION____________________________________________________
81 void custom_matrix_init(void) {
88 bool custom_matrix_scan(matrix_row_t current_matrix[]) {
90 for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
91 changed |= read_cols_on_row(current_matrix, current_row);