Tiny-Tetris/dpad.cpp at master · AJRussell/Tiny-Tetris · GitHub

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/*
 *
 * Dpad for Arduino TinyTetris
 *
 * Designed for https://github.com/AJRussell/Tiny-Tetris
 *
 * Clumsy code by tobozo (c+) 2016
 * Apologies for coding horror
 *
 */

#ifndef DPADCPP
#define DPADCPP

#include <Arduino.h>

#ifndef KEYPAD_PIN
#define KEYPAD_PIN  A0
#endif

// this is for analog 5x momentary buttons dpad
// as seen here http://fritzing.org/projects/arduino-5-buttons-keypad
// put your resistor calibration values here
const int dpad[5][2] = {
  {460, 480}, //KEY_MIDDLE 0
  {122, 234}, //KEY_LEFT 1
  {700, 750}, //KEY_RIGHT 2
  {-1,   70}, //KEY_DOWN 3
  {260, 350}  //KEY_ROTATE 4
};

static int dpadwarp[5] = { 0,0,0,0,0 };
static volatile int Debounce = 0;
static volatile bool processKey = true;
static volatile int currentPos;


class Dpad
{

  static const int DebounceMax = 10;

  public:

    static int getPos() {

      currentPos = getPosition(KEYPAD_PIN)*1;
      delay(100);

      for(int i=0;i<5;i++) {
        if(currentPos > dpad[i][0] && currentPos < dpad[i][1]) {
          return i;
        }
      }
      return -1;
    }

    static boolean DoDebounce() {
      Debounce++;
      if(Debounce > DebounceMax) {
        return true;
      }
      return false;
    }

    static int setAccel(int acceleration, int offset) {
      if(processKey) {
        dpadwarp[currentPos] = millis();
      }
      if(millis() < dpadwarp[currentPos] + offset) {
        processKey = false;
      } else {
        processKey = true;
        acceleration = acceleration + 70;
        if (acceleration > offset) {
          acceleration = offset;
        }
      }
      return acceleration;
    }

  private:

    static int getPosition(int pin) {
      return analogRead(pin);
    }
};

#endif