summaryrefslogtreecommitdiffstats
path: root/keyboards/handwired/promethium/matrix.c
blob: e3a41af288c5c24ed4fecded25bef7e1ae21ddfe (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
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
/*
Copyright 2012 Jun Wako
Copyright 2014 Jack Humbert
Copyright 2017 Priyadi Iman Nurcahyo

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>
#if defined(__AVR__)
#include <avr/io.h>
#endif
#include "wait.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "timer.h"


/* Set 0 if debouncing isn't needed */

#ifndef DEBOUNCE
#   define DEBOUNCE 5
#endif

#if (DEBOUNCE > 0)
    static uint16_t debouncing_time;
    static bool debouncing = false;
#endif

#if (MATRIX_COLS <= 8)
#    define print_matrix_header()  print("\nr/c 01234567\n")
#    define print_matrix_row(row)  print_bin_reverse8(matrix_get_row(row))
#    define matrix_bitpop(i)       bitpop(matrix[i])
#    define ROW_SHIFTER ((uint8_t)1)
#elif (MATRIX_COLS <= 16)
#    define print_matrix_header()  print("\nr/c 0123456789ABCDEF\n")
#    define print_matrix_row(row)  print_bin_reverse16(matrix_get_row(row))
#    define matrix_bitpop(i)       bitpop16(matrix[i])
#    define ROW_SHIFTER ((uint16_t)1)
#elif (MATRIX_COLS <= 32)
#    define print_matrix_header()  print("\nr/c 0123456789ABCDEF0123456789ABCDEF\n")
#    define print_matrix_row(row)  print_bin_reverse32(matrix_get_row(row))
#    define matrix_bitpop(i)       bitpop32(matrix[i])
#    define ROW_SHIFTER  ((uint32_t)1)
#endif

#ifdef MATRIX_MASKED
    extern const matrix_row_t matrix_mask[];
#endif

static const uint8_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
static const uint8_t tp_pins[3] = TRACKPOINT_PINS;

/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];

static void init_cols(void);
static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row);
static void unselect_rows(void);
static void select_row(uint8_t row);
static void unselect_row(uint8_t row);


__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) {
}

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();
    init_cols();

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

    matrix_init_quantum();
}

uint8_t matrix_scan(void)
{
    // Set row, read cols
    for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
#       if (DEBOUNCE > 0)
            bool matrix_changed = read_cols_on_row(matrix_debouncing, current_row);

            if (matrix_changed) {
                debouncing = true;
                debouncing_time = timer_read();
            }

#       else
            read_cols_on_row(matrix, current_row);
#       endif

    }

#   if (DEBOUNCE > 0)
        if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCE)) {
            for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
                matrix[i] = matrix_debouncing[i];
            }
            debouncing = false;
        }
#   endif

    matrix_scan_quantum();
    return 1;
}

bool matrix_is_modified(void)
{
#if (DEBOUNCE > 0)
    if (debouncing) return false;
#endif
    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)
{
    // Matrix mask lets you disable switches in the returned matrix data. For example, if you have a
    // switch blocker installed and the switch is always pressed.
#ifdef MATRIX_MASKED
    return matrix[row] & matrix_mask[row];
#else
    return matrix[row];
#endif
}

void matrix_print(void)
{
    print_matrix_header();

    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
        print_hex8(row); print(": ");
        print_matrix_row(row);
        print("\n");
    }
}

uint8_t matrix_key_count(void)
{
    uint8_t count = 0;
    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
        count += matrix_bitpop(i);
    }
    return count;
}


#define ROW_MASK 0b11100000

static const uint8_t row_bit[MATRIX_ROWS] = {
  //  76543210
    0b00000000,
    0b00100000,
    0b01000000,
    0b01100000,
    0b10000000,
    0b10100000,
    0b11000000,
    0b11100000,
};

static void init_cols(void)
{
    // columns
    for(uint8_t x = 0; x < MATRIX_COLS; x++) {
        uint8_t pin = col_pins[x];
        _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
        _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
    }

    // rows
    DDRF  |=  ROW_MASK;
    PORTF &= ~ROW_MASK;

    // trackpoint
    for(uint8_t x = 0; x < 3; x++) {
        uint8_t pin = tp_pins[x];
        _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
        _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
    }
}

static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
    {
        // Store last value of row prior to reading
        matrix_row_t last_row_value = current_matrix[current_row];

        // Clear data in matrix row
        current_matrix[current_row] = 0;

        // special case for trackpoint
        if (current_row == 8) {
            for(uint8_t tp_index = 0; tp_index < 3; tp_index++) {

                // Select the TP pin to read (active low)
                uint8_t pin = tp_pins[tp_index];
                uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF));

                // Populate the matrix row with the state of the col pin
                current_matrix[current_row] |=  pin_state ? 0 : (ROW_SHIFTER << tp_index);
            }
            return (last_row_value != current_matrix[current_row]);
        }

        // Select row and wait for row selecton to stabilize
        select_row(current_row);
        _delay_us(5);       // without this wait it won't read stable value.
        // wait_us(50);

        // For each col...
        for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {

            // Select the col pin to read (active low)
            uint8_t pin = col_pins[col_index];
            uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF));

            // Populate the matrix row with the state of the col pin
            current_matrix[current_row] |=  pin_state ? 0 : (ROW_SHIFTER << col_index);
        }

        // Unselect row
        unselect_row(current_row);

        return (last_row_value != current_matrix[current_row]);
}

static void select_row(uint8_t row)
{
    PORTF = row_bit[row] | (PORTF & ~ROW_MASK);
}

static void unselect_row(uint8_t row)
{
}

static void unselect_rows(void)
{
}