2 Copyright 2012 Jun Wako <wakojun@gmail.com>
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <util/delay.h>
29 * Happy Buckling Keyboard(IBM Model M mod)
38 static uint8_t debouncing = DEBOUNCE;
40 /* matrix state(1:on, 0:off) */
41 static matrix_row_t matrix[MATRIX_ROWS];
42 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
44 #ifdef MATRIX_HAS_GHOST
45 static bool matrix_has_ghost_in_row(uint8_t row);
47 static matrix_row_t read_cols(void);
48 static void unselect_rows(void);
49 static void select_row(uint8_t row);
53 uint8_t matrix_rows(void)
59 uint8_t matrix_cols(void)
64 void matrix_init(void)
66 // JTAG disable for PORT F. write JTD bit twice within four cycles.
73 // initialize columns to input with pull-up(DDR:0, PORT:1)
77 // initialize matrix state: all keys off
78 for (uint8_t i=0; i < MATRIX_ROWS; i++) {
80 matrix_debouncing[i] = 0;
84 uint8_t matrix_scan(void)
86 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
88 _delay_us(30); // without this wait read unstable value.
89 matrix_row_t cols = read_cols();
90 if (matrix_debouncing[i] != cols) {
91 matrix_debouncing[i] = cols;
93 debug("bounce!: "); debug_hex(debouncing); debug("\n");
95 debouncing = DEBOUNCE;
104 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
105 matrix[i] = matrix_debouncing[i];
113 bool matrix_is_modified(void)
115 if (debouncing) return false;
120 bool matrix_is_on(uint8_t row, uint8_t col)
122 return (matrix[row] & ((matrix_row_t)1<<col));
126 matrix_row_t matrix_get_row(uint8_t row)
131 void matrix_print(void)
133 print("\nr/c 01234567\n");
134 for (uint8_t row = 0; row < matrix_rows(); row++) {
135 phex(row); print(": ");
136 pbin_reverse(matrix_get_row(row));
137 #ifdef MATRIX_HAS_GHOST
138 if (matrix_has_ghost_in_row(row)) {
146 #ifdef MATRIX_HAS_GHOST
148 static bool matrix_has_ghost_in_row(uint8_t row)
150 // no ghost exists in case less than 2 keys on
151 if (((matrix[row] - 1) & matrix[row]) == 0)
154 // ghost exists in case same state as other row
155 for (uint8_t i=0; i < MATRIX_ROWS; i++) {
156 if (i != row && (matrix[i] & matrix[row]))
164 static matrix_row_t read_cols(void)
170 static void unselect_rows(void)
172 // Hi-Z(DDR:0, PORT:0) to unselect
174 PORTB &= ~0b11111111;
176 PORTF &= ~0b11110000;
180 static void select_row(uint8_t row)
182 // Output low(DDR:1, PORT:0) to select
202 DDRF |= (1<<(row-4));
203 PORTF &= ~(1<<(row-4));