/* Copyright 2011 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]; #ifdef MATRIX_HAS_GHOST static bool matrix_has_ghost_in_row(uint8_t row); #endif static matrix_row_t read_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(); // Input with pull-up(DDR:0, PORT:1) DDRB = 0x00; PORTB = 0xFF; // 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) { 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]; } } } return 1; } bool matrix_is_modified(void) { if (debouncing) return false; return true; } 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 01234567\n"); for (uint8_t row = 0; row < matrix_rows(); row++) { phex(row); print(": "); pbin_reverse(matrix_get_row(row)); #ifdef MATRIX_HAS_GHOST if (matrix_has_ghost_in_row(row)) { print(" <ghost"); } #endif print("\n"); } } #ifdef MATRIX_HAS_GHOST inline static bool matrix_has_ghost_in_row(uint8_t row) { // no ghost exists in case less than 2 keys on if (((matrix[row] - 1) & matrix[row]) == 0) return false; // ghost exists in case same state as other row for (uint8_t i=0; i < MATRIX_ROWS; i++) { if (i != row && (matrix[i] & matrix[row])) return true; } return false; } #endif inline static matrix_row_t read_cols(void) { return ~PINB; } inline static void unselect_rows(void) { // Hi-Z(DDR:0, PORT:0) to unselect DDRC &= ~0b01000000; // PC: 6 PORTC &= ~0b01000000; DDRD &= ~0b11100111; // PD: 7,6,5,2,1,0 PORTD &= ~0b11100111; DDRF &= ~0b11000000; // PF: 7,6 PORTF &= ~0b11000000; } inline static void select_row(uint8_t row) { // Output low(DDR:1, PORT:0) to select // row: 0 1 2 3 4 5 6 7 8 // pin: PD0, PD5, PD7, PF6, PD6, PD1, PD2, PC6, PF7 switch (row) { case 0: DDRD |= (1<<0); PORTD &= ~(1<<0); break; case 1: DDRD |= (1<<5); PORTD &= ~(1<<5); break; case 2: DDRD |= (1<<7); PORTD &= ~(1<<7); break; case 3: DDRF |= (1<<6); PORTF &= ~(1<<6); break; case 4: DDRD |= (1<<6); PORTD &= ~(1<<6); break; case 5: DDRD |= (1<<1); PORTD &= ~(1<<1); break; case 6: DDRD |= (1<<2); PORTD &= ~(1<<2); break; case 7: DDRC |= (1<<6); PORTC &= ~(1<<6); break; case 8: DDRF |= (1<<7); PORTF &= ~(1<<7); break; } }