summaryrefslogtreecommitdiffstats
path: root/keyboards/fc980c/matrix.c
blob: 3a3a13de588c65ea7b90f7314bbb129cc2715374 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/*
Copyright 2017 Balz Guenat
based on work by 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 "wait.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "timer.h"
#include "matrix.h"
#include "led.h"
// #include "fc980c.h"


// Timer resolution check
#if (1000000/TIMER_RAW_FREQ > 20)
#   error "Timer resolution(>20us) is not enough for HHKB matrix scan tweak on V-USB."
#endif


/*
 * Pin configuration for ATMega32U4
 *
 * Row:     PD4-6, PD7(~EN)
 * Col:     PB0-3
 * Key:     PC6(pull-uped)
 * Hys:     PC7
 */
static inline void KEY_ENABLE(void) { (PORTD &= ~(1<<7)); }
static inline void KEY_UNABLE(void) { (PORTD |=  (1<<7)); }
static inline bool KEY_STATE(void) { return (PINC & (1<<6)); }
static inline void KEY_HYS_ON(void) { (PORTC |=  (1<<7)); }
static inline void KEY_HYS_OFF(void) { (PORTC &= ~(1<<7)); }
static inline void KEY_INIT(void)
{
    /* Col */
    DDRB  |=  0x0F;
    /* Key: input with pull-up */
    DDRC  &= ~(1<<6);
    PORTC |=  (1<<6);
    /* Hys */
    DDRC  |=  (1<<7);
    /* Row */
    DDRD  |=  0xF0;

    KEY_UNABLE();
    KEY_HYS_OFF();
}
static inline void SET_ROW(uint8_t ROW)
{
    // PD4-6
    PORTD = (PORTD & 0x8F) | ((ROW & 0x07) << 4);
}
static inline void SET_COL(uint8_t COL)
{
    // PB0-3
    PORTB = (PORTB & 0xF0) | (COL & 0x0F);
}

static uint32_t matrix_last_modified = 0;

// matrix state buffer(1:on, 0:off)
static matrix_row_t *matrix;
static matrix_row_t *matrix_prev;
static matrix_row_t _matrix0[MATRIX_ROWS];
static matrix_row_t _matrix1[MATRIX_ROWS];


__attribute__ ((weak))
void matrix_init_quantum(void) {
    matrix_init_kb();
}

__attribute__ ((weak))
void matrix_scan_quantum(void) {
    matrix_scan_kb();
}

__attribute__ ((weak))
void matrix_init_kb(void) {
    matrix_init_user();
}

__attribute__ ((weak))
void matrix_scan_kb(void) {
    matrix_scan_user();
}

__attribute__ ((weak))
void matrix_init_user(void) {
}

__attribute__ ((weak))
void matrix_scan_user(void) {
}


void matrix_init(void)
{
    debug_enable = true;
    debug_matrix = true;

    KEY_INIT();

    // LEDs on NumLock, CapsLock and ScrollLock(PB4, PB5, PB6)
    DDRB  |= (1<<4) | (1<<5) | (1<<6);
    PORTB |= (1<<4) | (1<<5) | (1<<6);

    // initialize matrix state: all keys off
    for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
    for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
    matrix = _matrix0;
    matrix_prev = _matrix1;
    matrix_init_quantum();
}

uint8_t matrix_scan(void)
{
    matrix_row_t *tmp;

    tmp = matrix_prev;
    matrix_prev = matrix;
    matrix = tmp;

    uint8_t row, col;
    for (col = 0; col < MATRIX_COLS; col++) {
        SET_COL(col);
        for (row = 0; row < MATRIX_ROWS; row++) {
            //KEY_SELECT(row, col);
            SET_ROW(row);
            _delay_us(2);

            // Not sure this is needed. This just emulates HHKB controller's behaviour.
            if (matrix_prev[row] & (1<<col)) {
                KEY_HYS_ON();
            }
            _delay_us(10);

            // NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE.
            // If V-USB interrupts in this section we could lose 40us or so
            // and would read invalid value from KEY_STATE.
            uint8_t last = TIMER_RAW;

            KEY_ENABLE();

            // Wait for KEY_STATE outputs its value.
            _delay_us(2);

            if (KEY_STATE()) {
                matrix[row] &= ~(1<<col);
            } else {
                matrix[row] |= (1<<col);
            }

            // Ignore if this code region execution time elapses more than 20us.
            // MEMO: 20[us] * (TIMER_RAW_FREQ / 1000000)[count per us]
            // MEMO: then change above using this rule: a/(b/c) = a*1/(b/c) = a*(c/b)
            if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) {
                matrix[row] = matrix_prev[row];
            }

            _delay_us(5);
            KEY_HYS_OFF();
            KEY_UNABLE();

            // NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE.
            // This takes 25us or more to make sure KEY_STATE returns to idle state.
            _delay_us(75);
        }
        if (matrix[row] ^ matrix_prev[row]) {
            matrix_last_modified = timer_read32();
        }
    }
    matrix_scan_quantum();
    return 1;
}

inline
matrix_row_t matrix_get_row(uint8_t row) {
    return matrix[row];
}

void matrix_print(void)
{
#if (MATRIX_COLS <= 8)
    print("r/c 01234567\n");
#elif (MATRIX_COLS <= 16)
    print("r/c 0123456789ABCDEF\n");
#elif (MATRIX_COLS <= 32)
    print("r/c 0123456789ABCDEF0123456789ABCDEF\n");
#endif

    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {

#if (MATRIX_COLS <= 8)
        xprintf("%02X: %08b%s\n", row, bitrev(matrix_get_row(row)),
#elif (MATRIX_COLS <= 16)
        xprintf("%02X: %016b%s\n", row, bitrev16(matrix_get_row(row)),
#elif (MATRIX_COLS <= 32)
        xprintf("%02X: %032b%s\n", row, bitrev32(matrix_get_row(row)),
#endif
#ifdef MATRIX_HAS_GHOST
        matrix_has_ghost_in_row(row) ?  " <ghost" : ""
#else
        ""
#endif
        );
    }
}