/* Copyright 2019 * * 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 <avr/io.h> #include <string.h> #include "matrix.h" #include "pca9555.h" #include "quantum.h" #include "debug.h" // PCA9555 slave addresses #define IC1 0x20 #define IC2 0x21 //_____Utility funcs___________________________________________________________ static void init_pins(void) { // init all cols high - IC2 all input pca9555_set_config(IC2, PCA9555_PORT0, ALL_INPUT); // same as initial state pca9555_set_config(IC2, PCA9555_PORT1, ALL_INPUT); // same as initial state // init all rows - IC1 port0 input pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT); // same as initial state pca9555_set_output(IC1, PCA9555_PORT0, ALL_LOW); } static void select_row(uint8_t row) { // For the XD84 all rows are on the same IC and port // so its safe enough to assume here row == pin uint8_t pin = row; uint8_t mask = 1 << pin; // we configure output once in init, as pca9555 remembers state when flipping between input/output // pca9555_set_output(IC1, PCA9555_PORT0, ALL_HIGH & (~mask)); pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT & (~mask)); } static uint16_t read_cols(void) { // uint16_t state_1 = pca9555_readPins(IC2, PCA9555_PORT0); // uint16_t state_2 = pca9555_readPins(IC2, PCA9555_PORT1); uint16_t state = pca9555_readAllPins(IC2); // For the XD84 all cols are on the same IC and mapped sequentially // while this technically gives 16 column reads, // the 16th column can never be set so is safely ignored // return ~((state_2 << 8) | state_1); return ~state; } 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 selection to stabilize select_row(current_row); // Skip the wait_us(30); as i2c is slow enough to debounce the io changes current_matrix[current_row] = read_cols(); // No need to Unselect row as the next `select_row` will blank everything return (last_row_value != current_matrix[current_row]); } //_____CUSTOM MATRIX IMPLEMENTATION____________________________________________________ void matrix_init_custom(void) { pca9555_init(IC1); pca9555_init(IC2); 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; }