aboutsummaryrefslogtreecommitdiffstats
path: root/converter/terminal_usb/matrix.c
blob: 36901536f14e512a3d40b79f031979fa46664d66 (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
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
/*
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/>.
*/

#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "print.h"
#include "util.h"
#include "debug.h"
#include "ps2.h"
#include "matrix.h"


static void matrix_make(uint8_t code);
static void matrix_break(uint8_t code);
#ifdef MATRIX_HAS_GHOST
static bool matrix_has_ghost_in_row(uint8_t row);
#endif


/*
 * Matrix Array usage:
 * 'Scan Code Set 3' is assigned into 17x8 cell matrix.
 *
 *    8bit wide
 *   +---------+
 *  0|         |
 *  :|         | 0x00-0x87
 *  ;|         |
 * 17|         |
 *   +---------+
 */
static uint8_t matrix[MATRIX_ROWS];
#define ROW(code)      (code>>3)
#define COL(code)      (code&0x07)

static bool is_modified = false;


inline
uint8_t matrix_rows(void)
{
    return MATRIX_ROWS;
}

inline
uint8_t matrix_cols(void)
{
    return MATRIX_COLS;
}

void matrix_init(void)
{
    debug_enable = true;
    //debug_matrix = true;
    //debug_keyboard = true;
    //debug_mouse = false;

    ps2_host_init();

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

    return;
}

uint8_t matrix_scan(void)
{

    // scan code reading states
    static enum {
        RESET,
        RESET_RESPONSE,
        KBD_ID0,
        KBD_ID1,
        CONFIG,
        READY,
        F0,
    } state = RESET;

    is_modified = false;

    uint8_t code;
    if ((code = ps2_host_recv())) {
        debug("r"); debug_hex(code); debug(" ");
    }

    switch (state) {
        case RESET:
            debug("wFF ");
            if (ps2_host_send(0xFF) == 0xFA) {
                debug("[ack]\nRESET_RESPONSE: ");
                state = RESET_RESPONSE;
            }
            break;
        case RESET_RESPONSE:
            if (code == 0xAA) {
                debug("[ok]\nKBD_ID: ");
                state = KBD_ID0;
            } else if (code) {
                debug("err\nRESET: ");
                state = RESET;
            }
            break;
        // after reset receive keyboad ID(2 bytes)
        case KBD_ID0:
            if (code) {
                state = KBD_ID1;
            }
            break;
        case KBD_ID1:
            if (code) {
                debug("\nCONFIG: ");
                state = CONFIG;
            }
            break;
        case CONFIG:
            debug("wF8 ");
            if (ps2_host_send(0xF8) == 0xFA) {
                debug("[ack]\nREADY\n");
                state = READY;
            }
            break;
        case READY:
            switch (code) {
                case 0x00:
                    break;
                case 0xF0:
                    state = F0;
                    debug(" ");
                    break;
                default:    // normal key make
                    if (code < 0x88) {
                        matrix_make(code);
                    } else {
                        debug("unexpected scan code at READY: "); debug_hex(code); debug("\n");
                    }
                    state = READY;
                    debug("\n");
            }
            break;
        case F0:    // Break code
            switch (code) {
                case 0x00:
                    break;
                default:
                    if (code < 0x88) {
                        matrix_break(code);
                    } else {
                        debug("unexpected scan code at F0: "); debug_hex(code); debug("\n");
                    }
                    state = READY;
                    debug("\n");
            }
            break;
    }
    return 1;
}

bool matrix_is_modified(void)
{
    return is_modified;
}

inline
bool matrix_has_ghost(void)
{
#ifdef MATRIX_HAS_GHOST
    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
        if (matrix_has_ghost_in_row(i))
            return true;
    }
#endif
    return false;
}

inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
    return (matrix[row] & (1<<col));
}

inline
uint8_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");
    }
}

uint8_t matrix_key_count(void)
{
    uint8_t count = 0;
    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
        count += bitpop(matrix[i]);
    }
    return count;
}

#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]) == matrix[row])
            return true;
    }
    return false;
}
#endif


inline
static void matrix_make(uint8_t code)
{
    if (!matrix_is_on(ROW(code), COL(code))) {
        matrix[ROW(code)] |= 1<<COL(code);
        is_modified = true;
    }
}

inline
static void matrix_break(uint8_t code)
{
    if (matrix_is_on(ROW(code), COL(code))) {
        matrix[ROW(code)] &= ~(1<<COL(code));
        is_modified = true;
    }
}