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1 /*
2  * Copyright 2018 Jack Humbert <jack.humb@gmail.com>
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17
18 #include "encoder.h"
19 #ifdef SPLIT_KEYBOARD
20 #    include "split_util.h"
21 #endif
22
23 // for memcpy
24 #include <string.h>
25
26 #ifndef ENCODER_RESOLUTION
27 #    define ENCODER_RESOLUTION 4
28 #endif
29
30 #if !defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)
31 #    error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B"
32 #endif
33
34 #define NUMBER_OF_ENCODERS (sizeof(encoders_pad_a) / sizeof(pin_t))
35 static pin_t encoders_pad_a[] = ENCODERS_PAD_A;
36 static pin_t encoders_pad_b[] = ENCODERS_PAD_B;
37
38 static int8_t encoder_LUT[] = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0};
39
40 static uint8_t encoder_state[NUMBER_OF_ENCODERS] = {0};
41
42 #ifdef SPLIT_KEYBOARD
43 // slave half encoders come over as second set of encoders
44 static int8_t encoder_value[NUMBER_OF_ENCODERS * 2] = {0};
45 #else
46 static int8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
47 #endif
48
49 __attribute__((weak)) void encoder_update_user(int8_t index, bool clockwise) {}
50
51 __attribute__((weak)) void encoder_update_kb(int8_t index, bool clockwise) { encoder_update_user(index, clockwise); }
52
53 void encoder_init(void) {
54 #if defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
55     if (!isLeftHand) {
56         const pin_t encoders_pad_a_right[] = ENCODERS_PAD_A_RIGHT;
57         const pin_t encoders_pad_b_right[] = ENCODERS_PAD_B_RIGHT;
58         for (uint8_t i = 0; i < NUMBER_OF_ENCODERS; i++) {
59             encoders_pad_a[i] = encoders_pad_a_right[i];
60             encoders_pad_b[i] = encoders_pad_b_right[i];
61         }
62     }
63 #endif
64
65     for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
66         setPinInputHigh(encoders_pad_a[i]);
67         setPinInputHigh(encoders_pad_b[i]);
68
69         encoder_state[i] = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
70     }
71 }
72
73 void encoder_read(void) {
74     for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
75         encoder_state[i] <<= 2;
76         encoder_state[i] |= (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
77         encoder_value[i] += encoder_LUT[encoder_state[i] & 0xF];
78         if (encoder_value[i] >= ENCODER_RESOLUTION) {
79             encoder_update_kb(i, false);
80         }
81         if (encoder_value[i] <= -ENCODER_RESOLUTION) {  // direction is arbitrary here, but this clockwise
82             encoder_update_kb(i, true);
83         }
84         encoder_value[i] %= ENCODER_RESOLUTION;
85     }
86 }
87
88 #ifdef SPLIT_KEYBOARD
89 void encoder_state_raw(uint8_t* slave_state) { memcpy(slave_state, encoder_state, sizeof(encoder_state)); }
90
91 void encoder_update_raw(uint8_t* slave_state) {
92     for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
93         encoder_value[NUMBER_OF_ENCODERS + i] += encoder_LUT[slave_state[i] & 0xF];
94         if (encoder_value[NUMBER_OF_ENCODERS + i] >= ENCODER_RESOLUTION) {
95             encoder_update_kb(NUMBER_OF_ENCODERS + i, false);
96         }
97         if (encoder_value[NUMBER_OF_ENCODERS + i] <= -ENCODER_RESOLUTION) {  // direction is arbitrary here, but this clockwise
98             encoder_update_kb(NUMBER_OF_ENCODERS + i, true);
99         }
100         encoder_value[NUMBER_OF_ENCODERS + i] %= ENCODER_RESOLUTION;
101     }
102 }
103 #endif