2 Copyright 2013 Mathias Andersson <wraul@dbox.se>
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>
31 static uint8_t debouncing = DEBOUNCE;
33 /* matrix state(1:on, 0:off) */
34 static matrix_row_t matrix[MATRIX_ROWS];
35 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
37 static uint8_t read_rows(void);
38 static uint8_t read_caps(void);
39 static void init_rows(void);
40 static void unselect_cols(void);
41 static void select_col(uint8_t col);
44 uint8_t matrix_rows(void)
50 uint8_t matrix_cols(void)
55 void matrix_init(void)
59 // initialize matrix state: all keys off
60 for (uint8_t i=0; i < MATRIX_ROWS; i++) {
62 matrix_debouncing[i] = 0;
66 uint8_t matrix_scan(void)
68 for (uint8_t col = 0; col < MATRIX_COLS; col++) { // 0-16
70 _delay_us(3); // TODO: Determine the correct value needed here.
71 uint8_t rows = read_rows();
72 // Use the otherwise unused col: 0 row: 3 for caps lock.
76 for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5
77 bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
78 bool curr_bit = rows & (1<<row);
79 if (prev_bit != curr_bit) {
80 matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
82 dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
84 debouncing = DEBOUNCE;
94 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
95 matrix[i] = matrix_debouncing[i];
103 bool matrix_is_modified(void)
105 if (debouncing) return false;
110 bool matrix_is_on(uint8_t row, uint8_t col)
112 return (matrix[row] & ((matrix_row_t)1<<col));
116 matrix_row_t matrix_get_row(uint8_t row)
121 void matrix_print(void)
123 print("\nr/c 0123456789ABCDEF\n");
124 for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
125 xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
129 uint8_t matrix_key_count(void)
132 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
133 count += bitpop32(matrix[i]);
138 /* Row pin configuration
140 * pin: D0 D1 D2 D3 D5 B7
142 * Caps lock uses its own pin PE2
144 static void init_rows(void)
146 // Input (DDR:0, PORT:0)
148 PORTD &= ~0b00101111;
152 // Input with pull-up (DDR:0, PORT:1)
157 static uint8_t read_rows(void)
159 return (PIND&(1<<0) ? (1<<0) : 0) |
160 (PIND&(1<<1) ? (1<<1) : 0) |
161 (PIND&(1<<2) ? (1<<2) : 0) |
162 (PIND&(1<<3) ? (1<<3) : 0) |
163 (PIND&(1<<5) ? (1<<4) : 0) |
164 (PINB&(1<<7) ? (1<<5) : 0);
167 static uint8_t read_caps(void)
169 return PINE&(1<<2) ? 0 : (1<<3);
173 * These columns uses two 74HC237D 3 to 8 bit demultiplexers.
174 * col / pin: PC6 PB6 PF0 PF1 PC7
195 static void unselect_cols(void)
197 DDRB |= (1<<5) | (1<<6);
198 PORTB &= ~((1<<5) | (1<<6));
200 DDRC |= (1<<6) | (1<<7);
201 PORTC &= ~((1<<6) | (1<<7));
203 DDRF |= (1<<0) | (1<<1);
204 PORTF &= ~((1<<0) | (1<<1));
207 static void select_col(uint8_t col)
209 // Output high (DDR:1, PORT:1) to select
224 PORTF |= (1<<0) | (1<<1);
242 PORTF |= (1<<0) | (1<<1);
258 PORTF |= (1<<0) | (1<<1);
276 PORTF |= (1<<0) | (1<<1);