1  // Copyright (C) 2024, Mark Qvist
 2  
 3  // This program is free software: you can redistribute it and/or modify
 4  // it under the terms of the GNU General Public License as published by
 5  // the Free Software Foundation, either version 3 of the License, or
 6  // (at your option) any later version.
 7  
 8  // This program is distributed in the hope that it will be useful,
 9  // but WITHOUT ANY WARRANTY; without even the implied warranty of
10  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  // GNU General Public License for more details.
12  
13  // You should have received a copy of the GNU General Public License
14  // along with this program.  If not, see <https://www.gnu.org/licenses/>.
15  
16  #ifndef INPUT_H
17    #define INPUT_H
18    
19    #define PIN_BUTTON pin_btn_usr1
20  
21    #define PRESSED LOW
22    #define RELEASED HIGH
23  
24    #define EVENT_ALL                 0x00
25    #define EVENT_CLICKS              0x01
26    #define EVENT_BUTTON_DOWN         0x11
27    #define EVENT_BUTTON_UP           0x12
28    #define EVENT_BUTTON_CLICK        0x13
29    #define EVENT_BUTTON_DOUBLE_CLICK 0x14
30    #define EVENT_BUTTON_TRIPLE_CLICK 0x15
31    
32    int button_events = EVENT_CLICKS;
33    int button_state = RELEASED;
34    int debounce_state = button_state;
35    unsigned long button_debounce_last = 0;
36    unsigned long button_debounce_delay = 25;
37    unsigned long button_down_last = 0;
38    unsigned long button_up_last = 0;
39  
40    // Forward declaration
41    void button_event(uint8_t event, unsigned long duration);
42  
43    void input_init() {
44      pinMode(PIN_BUTTON, INPUT_PULLUP);
45    }
46  
47    void input_get_all_events() {
48      button_events = EVENT_ALL;
49    }
50  
51    void input_get_click_events() {
52      button_events = EVENT_CLICKS;
53    }
54  
55    void input_read() {
56      int button_reading = digitalRead(PIN_BUTTON);
57      if (button_reading != debounce_state) {
58        button_debounce_last = millis();
59        debounce_state = button_reading;
60      }
61  
62      if ((millis() - button_debounce_last) > button_debounce_delay) {
63        if (button_reading != button_state) {
64          // State changed
65          int previous_state = button_state;
66          button_state = button_reading;
67  
68          if (button_events == EVENT_ALL) {
69            if (button_state == PRESSED) {
70              button_event(EVENT_BUTTON_DOWN, 0);
71            } else if (button_state == RELEASED) {
72              button_event(EVENT_BUTTON_UP, 0);
73            }
74          } else if (button_events == EVENT_CLICKS) {
75            if (previous_state == PRESSED && button_state == RELEASED) {
76              button_up_last = millis();
77              button_event(EVENT_BUTTON_CLICK, button_up_last-button_down_last);
78            } else if (previous_state == RELEASED && button_state == PRESSED) {
79              button_down_last = millis();
80            }
81          }
82        }
83      }
84  
85    }
86  
87    bool button_pressed() {
88      if (button_state == PRESSED) {
89        return true;
90      } else {
91        return false;
92      }
93    }
94  
95  #endif