/* Copyright 2018 Carlos Filoteo 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/>. */ /* * scan matrix */ #include <stdint.h> #include <stdbool.h> #include <avr/io.h> #include <util/delay.h> #include "print.h" #include "debug.h" #include "util.h" #include "matrix.h" #ifndef DEBOUNCE # define DEBOUNCE 5 #endif static uint8_t debouncing = DEBOUNCE; /* matrix state(1:on, 0:off) */ static matrix_row_t matrix[MATRIX_ROWS]; static matrix_row_t matrix_debouncing[MATRIX_ROWS]; static matrix_row_t read_cols(void); static void init_cols(void); static void unselect_rows(void); static void select_row(uint8_t row); inline uint8_t matrix_rows(void) { return MATRIX_ROWS; } inline uint8_t matrix_cols(void) { return MATRIX_COLS; } void matrix_init(void) { // initialize row and col unselect_rows(); init_cols(); // initialize matrix state: all keys off for (uint8_t i=0; i < MATRIX_ROWS; i++) { matrix[i] = 0; matrix_debouncing[i] = 0; } } uint8_t matrix_scan(void) { for (uint8_t i = 0; i < MATRIX_ROWS; i++) { select_row(i); _delay_us(30); // without this wait read unstable value. matrix_row_t cols = read_cols(); if (matrix_debouncing[i] != cols) { matrix_debouncing[i] = cols; if (debouncing) { dprintf("bounce!: %02X\n", debouncing); } debouncing = DEBOUNCE; } unselect_rows(); } if (debouncing) { if (--debouncing) { _delay_ms(1); } else { for (uint8_t i = 0; i < MATRIX_ROWS; i++) { matrix[i] = matrix_debouncing[i]; } } } return 1; } inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1<<col)); } inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; } void matrix_print(void) { print("\nr/c 0123456789ABCDEF\n"); for (uint8_t row = 0; row < MATRIX_ROWS; row++) { print_hex8(row); print(": "); print_bin_reverse16(matrix_get_row(row)); print("\n"); } } /* Column pin configuration * col: 0 1 2 3 4 5 6 7 8 9 10 11 * pin: D7 E6 B4 B5 B6 B2 B3 B1 F7 F6 F5 F4 */ static void init_cols(void) { // Input with pull-up(DDR:0, PORT:1) gpio_set_pin_input_high(F4); gpio_set_pin_input_high(F5); gpio_set_pin_input_high(F6); gpio_set_pin_input_high(F7); gpio_set_pin_input_high(E6); gpio_set_pin_input_high(D7); gpio_set_pin_input_high(B1); gpio_set_pin_input_high(B2); gpio_set_pin_input_high(B3); gpio_set_pin_input_high(B4); gpio_set_pin_input_high(B5); gpio_set_pin_input_high(B6); } static matrix_row_t read_cols(void) { return (PIND&(1<<7) ? 0 : (1<<0)) | (PINE&(1<<6) ? 0 : (1<<1)) | (PINB&(1<<4) ? 0 : (1<<2)) | (PINB&(1<<5) ? 0 : (1<<3)) | (PINB&(1<<6) ? 0 : (1<<4)) | (PINB&(1<<2) ? 0 : (1<<5)) | (PINB&(1<<3) ? 0 : (1<<6)) | (PINB&(1<<1) ? 0 : (1<<7)) | (PINF&(1<<7) ? 0 : (1<<8)) | (PINF&(1<<6) ? 0 : (1<<9)) | (PINF&(1<<5) ? 0 : (1<<10)) | (PINF&(1<<4) ? 0 : (1<<11)); } /* Row pin configuration * row: 0 1 2 3 * pin: D1 D0 D4 C6 */ static void unselect_rows(void) { // Hi-Z(DDR:0, PORT:0) to unselect gpio_set_pin_input(C6); gpio_set_pin_input(D0); gpio_set_pin_input(D1); gpio_set_pin_input(D4); } static void select_row(uint8_t row) { // Output low(DDR:1, PORT:0) to select switch (row) { case 0: gpio_set_pin_output(D1); gpio_write_pin_low(D1); break; case 1: gpio_set_pin_output(D0); gpio_write_pin_low(D0); break; case 2: gpio_set_pin_output(D4); gpio_write_pin_low(D4); break; case 3: gpio_set_pin_output(C6); gpio_write_pin_low(C6); break; } }