summaryrefslogtreecommitdiffstats
path: root/quantum/encoder.c
blob: 0a3d6f577c3825f8f1d8c13a8e4a29707d91b5f8 (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
/*
 * Copyright 2018 Jack Humbert <jack.humb@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 "encoder.h"
#ifdef SPLIT_KEYBOARD
#    include "split_util.h"
#endif

// for memcpy
#include <string.h>

#if !defined(ENCODER_RESOLUTIONS) && !defined(ENCODER_RESOLUTION)
#    define ENCODER_RESOLUTION 4
#endif

#if !defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)
#    error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B"
#endif

extern volatile bool isLeftHand;

static pin_t encoders_pad_a[NUM_ENCODERS_MAX_PER_SIDE] = ENCODERS_PAD_A;
static pin_t encoders_pad_b[NUM_ENCODERS_MAX_PER_SIDE] = ENCODERS_PAD_B;

#ifdef ENCODER_RESOLUTIONS
static uint8_t encoder_resolutions[NUM_ENCODERS] = ENCODER_RESOLUTIONS;
#endif

#ifndef ENCODER_DIRECTION_FLIP
#    define ENCODER_CLOCKWISE true
#    define ENCODER_COUNTER_CLOCKWISE false
#else
#    define ENCODER_CLOCKWISE false
#    define ENCODER_COUNTER_CLOCKWISE true
#endif
static int8_t encoder_LUT[] = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0};

static uint8_t encoder_state[NUM_ENCODERS]  = {0};
static int8_t  encoder_pulses[NUM_ENCODERS] = {0};

// encoder counts
static uint8_t thisCount;
#ifdef SPLIT_KEYBOARD
// encoder offsets for each hand
static uint8_t thisHand, thatHand;
// encoder counts for each hand
static uint8_t thatCount;
#endif

static uint8_t encoder_value[NUM_ENCODERS] = {0};

__attribute__((weak)) void encoder_wait_pullup_charge(void) {
    wait_us(100);
}

__attribute__((weak)) bool encoder_update_user(uint8_t index, bool clockwise) {
    return true;
}

__attribute__((weak)) bool encoder_update_kb(uint8_t index, bool clockwise) {
    return encoder_update_user(index, clockwise);
}

void encoder_init(void) {
#ifdef SPLIT_KEYBOARD
    thisHand  = isLeftHand ? 0 : NUM_ENCODERS_LEFT;
    thatHand  = NUM_ENCODERS_LEFT - thisHand;
    thisCount = isLeftHand ? NUM_ENCODERS_LEFT : NUM_ENCODERS_RIGHT;
    thatCount = isLeftHand ? NUM_ENCODERS_RIGHT : NUM_ENCODERS_LEFT;
#else // SPLIT_KEYBOARD
    thisCount                = NUM_ENCODERS;
#endif

#ifdef ENCODER_TESTS
    // Annoying that we have to clear out values during initialisation here, but
    // because all the arrays are static locals, rerunning tests in the same
    // executable doesn't reset any of these. Kinda crappy having test-only code
    // here, but it's the simplest solution.
    memset(encoder_value, 0, sizeof(encoder_value));
    memset(encoder_state, 0, sizeof(encoder_state));
    memset(encoder_pulses, 0, sizeof(encoder_pulses));
    static const pin_t encoders_pad_a_left[] = ENCODERS_PAD_A;
    static const pin_t encoders_pad_b_left[] = ENCODERS_PAD_B;
    for (uint8_t i = 0; i < thisCount; i++) {
        encoders_pad_a[i] = encoders_pad_a_left[i];
        encoders_pad_b[i] = encoders_pad_b_left[i];
    }
#endif

#if defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
    // Re-initialise the pads if it's the right-hand side
    if (!isLeftHand) {
        static const pin_t encoders_pad_a_right[] = ENCODERS_PAD_A_RIGHT;
        static const pin_t encoders_pad_b_right[] = ENCODERS_PAD_B_RIGHT;
        for (uint8_t i = 0; i < thisCount; i++) {
            encoders_pad_a[i] = encoders_pad_a_right[i];
            encoders_pad_b[i] = encoders_pad_b_right[i];
        }
    }
#endif // defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)

    // Encoder resolutions is handled purely master-side, so concatenate the two arrays
#if defined(SPLIT_KEYBOARD) && defined(ENCODER_RESOLUTIONS)
#    if defined(ENCODER_RESOLUTIONS_RIGHT)
    static const uint8_t encoder_resolutions_right[NUM_ENCODERS_RIGHT] = ENCODER_RESOLUTIONS_RIGHT;
#    else  // defined(ENCODER_RESOLUTIONS_RIGHT)
    static const uint8_t encoder_resolutions_right[NUM_ENCODERS_RIGHT] = ENCODER_RESOLUTIONS;
#    endif // defined(ENCODER_RESOLUTIONS_RIGHT)
    for (uint8_t i = 0; i < NUM_ENCODERS_RIGHT; i++) {
        encoder_resolutions[NUM_ENCODERS_LEFT + i] = encoder_resolutions_right[i];
    }
#endif // defined(SPLIT_KEYBOARD) && defined(ENCODER_RESOLUTIONS)

    for (uint8_t i = 0; i < thisCount; i++) {
        setPinInputHigh(encoders_pad_a[i]);
        setPinInputHigh(encoders_pad_b[i]);
    }
    encoder_wait_pullup_charge();
    for (uint8_t i = 0; i < thisCount; i++) {
        encoder_state[i] = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
    }
}

static bool encoder_update(uint8_t index, uint8_t state) {
    bool    changed = false;
    uint8_t i       = index;

#ifdef ENCODER_RESOLUTIONS
    const uint8_t resolution = encoder_resolutions[i];
#else
    const uint8_t resolution = ENCODER_RESOLUTION;
#endif

#ifdef SPLIT_KEYBOARD
    index += thisHand;
#endif
    encoder_pulses[i] += encoder_LUT[state & 0xF];
    if (encoder_pulses[i] >= resolution) {
        encoder_value[index]++;
        changed = true;
        encoder_update_kb(index, ENCODER_COUNTER_CLOCKWISE);
    }
    if (encoder_pulses[i] <= -resolution) { // direction is arbitrary here, but this clockwise
        encoder_value[index]--;
        changed = true;
        encoder_update_kb(index, ENCODER_CLOCKWISE);
    }
    encoder_pulses[i] %= resolution;
#ifdef ENCODER_DEFAULT_POS
    if ((state & 0x3) == ENCODER_DEFAULT_POS) {
        encoder_pulses[i] = 0;
    }
#endif
    return changed;
}

bool encoder_read(void) {
    bool changed = false;
    for (uint8_t i = 0; i < thisCount; i++) {
        uint8_t new_status = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
        if ((encoder_state[i] & 0x3) != new_status) {
            encoder_state[i] <<= 2;
            encoder_state[i] |= new_status;
            changed |= encoder_update(i, encoder_state[i]);
        }
    }
    return changed;
}

#ifdef SPLIT_KEYBOARD
void last_encoder_activity_trigger(void);

void encoder_state_raw(uint8_t *slave_state) {
    memcpy(slave_state, &encoder_value[thisHand], sizeof(uint8_t) * thisCount);
}

void encoder_update_raw(uint8_t *slave_state) {
    bool changed = false;
    for (uint8_t i = 0; i < thatCount; i++) { // Note inverted logic -- we want the opposite side
        const uint8_t index = i + thatHand;
        int8_t        delta = slave_state[i] - encoder_value[index];
        while (delta > 0) {
            delta--;
            encoder_value[index]++;
            changed = true;
            encoder_update_kb(index, ENCODER_COUNTER_CLOCKWISE);
        }
        while (delta < 0) {
            delta++;
            encoder_value[index]--;
            changed = true;
            encoder_update_kb(index, ENCODER_CLOCKWISE);
        }
    }

    // Update the last encoder input time -- handled external to encoder_read() when we're running a split
    if (changed) last_encoder_activity_trigger();
}
#endif