/* Copyright 2012 Jun Wako <wakojun@gmail.com> 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; } //debug debug_matrix = true; LED_ON(); _delay_ms(500); LED_OFF(); } 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) { debug("bounce!: "); debug_hex(debouncing); debug("\n"); } 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]; } } } matrix_scan_quantum(); 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++) { phex(row); print(": "); pbin_reverse16(matrix_get_row(row)); print("\n"); } } /* Column pin configuration * col: 0 1 2 3 4 5 6 7 * pin: B0 B1 B2 B3 B4 B5 B6 B7 */ static void init_cols(void) { // Input with pull-up(DDR:0, PORT:1) DDRB &= ~0b11111111; PORTB |= 0b11111111; } /* Returns status of switches(1:on, 0:off) */ static matrix_row_t read_cols(void) { // Invert because PIN indicates 'switch on' with low(0) and 'off' with high(1) return ~PINB; } /* Row pin configuration * row: 0 1 2 3 4 5 6 7 * pin: D0 D1 D2 D3 D4 D5 D6 C2 */ static void unselect_rows(void) { // Hi-Z(DDR:0, PORT:0) to unselect DDRD &= ~0b01111111; PORTD &= ~0b01111111; DDRC &= ~0b00000100; PORTC &= ~0b00000100; } static void select_row(uint8_t row) { // Output low(DDR:1, PORT:0) to select switch (row) { case 0: DDRD |= (1<<0); PORTD &= ~(1<<0); break; case 1: DDRD |= (1<<1); PORTD &= ~(1<<1); break; case 2: DDRD |= (1<<2); PORTD &= ~(1<<2); break; case 3: DDRD |= (1<<3); PORTD &= ~(1<<3); break; case 4: DDRD |= (1<<4); PORTD &= ~(1<<4); break; case 5: DDRD |= (1<<5); PORTD &= ~(1<<5); break; case 6: DDRD |= (1<<6); PORTD &= ~(1<<6); break; case 7: DDRC |= (1<<2); PORTC &= ~(1<<2); break; } }