- /*
- Copyright 2011 Jun Wako <[email protected]>
-
- 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;
- }
- }
|