summaryrefslogtreecommitdiffstats
path: root/keyboards/gboards/gergoplex/matrix.c
blob: a075b8572584c84bee64e0a2ed2b58ea99017097 (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
/*

Copyright 2013 Oleg Kostyuk <cub.uanic@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 "matrix.h"
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include "wait.h"
#include "action_layer.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "debounce.h"
#include "gergoplex.h"

#ifdef BALLER
#    include <avr/interrupt.h>
#    include "pointing_device.h"
#endif

#ifndef DEBOUNCE
#    define DEBOUNCE 5
#endif

// ATmega pin defs
#define ROW1 (1 << 6)
#define ROW2 (1 << 5)
#define ROW3 (1 << 4)
#define ROW4 (1 << 1)

/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
/*
 * matrix state(1:on, 0:off)
 * contains the raw values without debounce filtering of the last read cycle.
 */
static matrix_row_t raw_matrix[MATRIX_ROWS];

static const pin_t row_pins[MATRIX_COLS] = MATRIX_ROW_PINS;
// Right-hand side only pins, the left side is controlled my MCP
static const pin_t col_pins[MATRIX_ROWS_PER_SIDE] = MATRIX_COL_PINS;

// Debouncing: store for each key the number of scans until it's eligible to
// change.  When scanning the matrix, ignore any changes in keys that have
// already changed in the last DEBOUNCE scans.

static matrix_row_t read_cols(uint8_t row);
static void         init_cols(void);
static void         unselect_rows(void);
static void         select_row(uint8_t row);

static uint8_t mcp23018_reset_loop;

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

void matrix_init(void) {
    // initialize row and col
    mcp23018_status = init_mcp23018();
    unselect_rows();
    init_cols();

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

    debounce_init(MATRIX_ROWS);
    matrix_init_quantum();
}
void matrix_power_up(void) {
    mcp23018_status = init_mcp23018();

    unselect_rows();
    init_cols();

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

// Reads and stores a row, returning
// whether a change occurred.
static inline bool store_raw_matrix_row(uint8_t index) {
    matrix_row_t temp = read_cols(index);
    if (raw_matrix[index] != temp) {
        raw_matrix[index] = temp;
        return true;
    }
    return false;
}
uint8_t matrix_scan(void) {
    if (mcp23018_status) {  // if there was an error
        if (++mcp23018_reset_loop == 0) {
            // if (++mcp23018_reset_loop >= 1300) {
            // since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
            // this will be approx bit more frequent than once per second
            print("trying to reset mcp23018\n");
            mcp23018_status = init_mcp23018();
            if (mcp23018_status) {
                print("left side not responding\n");
            } else {
                print("left side attached\n");
            }
        }
    }

    bool changed = false;
    for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
        // select rows from left and right hands
        uint8_t left_index  = i;
        uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
        select_row(left_index);
        select_row(right_index);

        // we don't need a 30us delay anymore, because selecting a
        // left-hand row requires more than 30us for i2c.

        changed |= store_raw_matrix_row(left_index);
        changed |= store_raw_matrix_row(right_index);

        unselect_rows();
    }

    debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
    matrix_scan_quantum();

#ifdef DEBUG_MATRIX
    for (uint8_t c = 0; c < MATRIX_COLS; c++)
        for (uint8_t r = 0; r < MATRIX_ROWS; r++)
            if (matrix_is_on(r, c)) xprintf("r:%d c:%d \n", r, c);
#endif

    return 1;
}

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) { return matrix[row]; }

void matrix_print(void) {
    print("\nr/c 0123456789ABCDEF\n");
    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
        print_hex8(row);
        print(": ");
        print_bin_reverse16(matrix_get_row(row));
        print("\n");
    }
}
uint8_t matrix_key_count(void) {
    uint8_t count = 0;
    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
        count += bitpop16(matrix[i]);
    }
    return count;
}

// Remember this means ROWS
static void init_cols(void) {
    for (uint8_t row = 0; row < MATRIX_COLS; row++) {
      setPinInputHigh(row_pins[row]);
    }
}

static matrix_row_t read_cols(uint8_t row) {
    if (row < 5) {
        if (mcp23018_status) {  // if there was an error
            return 0;
        } else {
            uint8_t data    = 0;
            mcp23018_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);
            if (mcp23018_status) goto out;
            mcp23018_status = i2c_read_nack(I2C_TIMEOUT);
            if (mcp23018_status < 0) goto out;
            data            = ~((uint8_t)mcp23018_status);
            mcp23018_status = I2C_STATUS_SUCCESS;
        out:
            i2c_stop();

#ifdef DEBUG_MATRIX
            if (data != 0x00) xprintf("I2C: %d\n", data);
#endif
            return data;
        }
    } else {
        return ~((((PINF & ROW4) >> 1) | ((PINF & (ROW1 | ROW2 | ROW3)) >> 3)) & 0xF);
    }
}

// Row pin configuration
static void unselect_rows(void) {
    // no need to unselect on mcp23018, because the select step sets all
    // the other row bits high, and it's not changing to a different direction

    for (uint8_t col = 0; col < MATRIX_ROWS_PER_SIDE; col++) {
      setPinInput(col_pins[col]);
      writePinLow(col_pins[col]);
    }
}

static void select_row(uint8_t row) {
    if (row < 5) {
        // select on mcp23018
        if (mcp23018_status) {  // do nothing on error
        } else {                // set active row low  : 0 // set other rows hi-Z : 1
            mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
            if (mcp23018_status) goto out;
            mcp23018_status = i2c_write(GPIOA, I2C_TIMEOUT);
            if (mcp23018_status) goto out;
            mcp23018_status = i2c_write(0xFF & ~(1 << (row + 1)), I2C_TIMEOUT);
            if (mcp23018_status) goto out;
        out:
            i2c_stop();
        }
    } else {
        setPinOutput(col_pins[row - MATRIX_ROWS_PER_SIDE]);
        writePinLow(col_pins[row - MATRIX_ROWS_PER_SIDE]);
    }
}