src/lib/SCREEN/FiveWayButton/FiveWayButton.cpp

   1 #ifdef HAS_FIVE_WAY_BUTTON
   2 #include "FiveWayButton.h"
   3
   4 #define KEY_DEBOUNCE_TIME   500
   5 #define KEY_LONG_RPESS_TIME 1000
   6 #define KEY_CHECK_OVER_TIME 2000
   7
   8
   9 uint32_t key_debounce_start = 0;
  10
  11 int key = INPUT_KEY_NO_PRESS;
  12
  13
  14 #ifdef GPIO_PIN_JOYSTICK
  15 #define UP    0;
  16 #define DOWN  1;
  17 #define LEFT  2;
  18 #define RIGHT 3;
  19 #define ENTER 4;
  20 #define IDLE  5;
  21
  22 static int16_t joyAdcValues[] = JOY_ADC_VALUES;
  23
  24 // Returns minimum difference between any pair
  25 int findMinDiff(int16_t arr[], int n)
  26 {
  27 // Initialize difference as infinite
  28 int diff = 1000;
  29
  30 // Find the min diff by comparing difference
  31 // of all possible pairs in given array
  32 for (int i=0; i<n-1; i++)
  33     for (int j=i+1; j<n; j++)
  34         if (abs(arr[i] - arr[j]) < diff)
  35                 diff = abs(arr[i] - arr[j]);
  36
  37 // Return min diff
  38 return diff;
  39 }
  40
  41 bool checkValue(int direction){
  42     int value = analogRead(GPIO_PIN_JOYSTICK);
  43     if(value < (joyAdcValues[direction] + 50) && value > (joyAdcValues[direction] - 50)){
  44         return true;
  45     } else {
  46         return false;
  47     }
  48 }
  49
  50 int checkKey()
  51 {
  52     int fuzz = (findMinDiff(joyAdcValues, 6) /2 );
  53     int value = analogRead(GPIO_PIN_JOYSTICK);
  54
  55     if(value < (joyAdcValues[0] + fuzz) && value > (joyAdcValues[0] - fuzz))
  56         return INPUT_KEY_UP_PRESS;
  57     else if(value < (joyAdcValues[1] + fuzz) && value > (joyAdcValues[1] - fuzz))
  58         return INPUT_KEY_DOWN_PRESS;
  59     else if(value < (joyAdcValues[2] + fuzz) && value > (joyAdcValues[2] - fuzz))
  60         return INPUT_KEY_LEFT_PRESS;
  61     else if(value < (joyAdcValues[3] + fuzz) && value > (joyAdcValues[3] - fuzz))
  62         return INPUT_KEY_RIGHT_PRESS;
  63     else if(value < (joyAdcValues[4] + fuzz) && value > (joyAdcValues[4] - fuzz))
  64         return INPUT_KEY_OK_PRESS;
  65     else
  66         return INPUT_KEY_NO_PRESS;
  67 }
  68 #endif
  69
  70 void FiveWayButton::init()
  71 {
  72     #ifndef JOY_ADC_VALUES
  73     pinMode(GPIO_PIN_FIVE_WAY_INPUT1, INPUT|PULLUP );
  74     pinMode(GPIO_PIN_FIVE_WAY_INPUT2, INPUT|PULLUP );
  75     pinMode(GPIO_PIN_FIVE_WAY_INPUT3, INPUT|PULLUP );
  76     #endif
  77
  78     key_state = INPUT_KEY_NO_PRESS;
  79     keyPressed = false;
  80     isLongPressed = false;
  81 }
  82
  83 void FiveWayButton::handle()
  84 {
  85     if(keyPressed)
  86     {
  87         #ifndef JOY_ADC_VALUES
  88         int key_down = digitalRead(GPIO_PIN_FIVE_WAY_INPUT1) << 2 |  digitalRead(GPIO_PIN_FIVE_WAY_INPUT2) << 1 |  digitalRead(GPIO_PIN_FIVE_WAY_INPUT3);
  89         #else
  90         // Hack, we know that INPUT_KEY_NO_PRESS = 7 so for analog we would have to have it equal idle
  91         int key_down = checkKey();
  92         #endif
  93
  94
  95         if(key_down == INPUT_KEY_NO_PRESS)
  96         {
  97             //key released
  98             if(isLongPressed)
  99             {
 100                 clearKeyState();
 101             }
 102             else
 103             {
 104                 key_state = key;
 105                 if((millis() - key_debounce_start) > KEY_DEBOUNCE_TIME)
 106                 {
 107                     keyPressed = false;
 108                 }
 109             }
 110         }
 111         else
 112         {
 113             if((millis() - key_debounce_start) > KEY_LONG_RPESS_TIME)
 114             {
 115                 isLongPressed = true;
 116             }
 117         }
 118     }
 119     else
 120     {
 121         #ifndef JOY_ADC_VALUES
 122         key = digitalRead(GPIO_PIN_FIVE_WAY_INPUT1) << 2 |  digitalRead(GPIO_PIN_FIVE_WAY_INPUT2) << 1 |  digitalRead(GPIO_PIN_FIVE_WAY_INPUT3);
 123         #else
 124         key = checkKey();
 125         #endif
 126
 127         if(key != INPUT_KEY_NO_PRESS)
 128         {
 129             keyPressed = true;
 130             isLongPressed = false;
 131             key_debounce_start = millis();
 132         }
 133     }
 134 }
 135
 136 void FiveWayButton::getKeyState(int *keyValue, bool *keyLongPressed)
 137 {
 138     *keyValue = key_state;
 139     *keyLongPressed = isLongPressed;
 140     if(key_state != INPUT_KEY_NO_PRESS)
 141     {
 142         clearKeyState();
 143     }
 144 }
 145
 146 void FiveWayButton::clearKeyState()
 147 {
 148    keyPressed = false;
 149    isLongPressed = false;
 150    key_state = INPUT_KEY_NO_PRESS;
 151 }
 152 #endif