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1 // rewritten from distro version by drewp 2015-01-04
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2
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3 #include "Arduino.h"
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4 #include "DFR_Key.h"
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5
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6 static int DEFAULT_KEY_PIN = 0;
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7 static int DEFAULT_THRESHOLD = 5;
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8
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9 // Updated for my board
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10 static int UPKEY_ARV = 103; //that's read "analogue read value"
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11 static int DOWNKEY_ARV = 266;
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12 static int LEFTKEY_ARV = 426;
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13 static int RIGHTKEY_ARV = 0;
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14 static int SELKEY_ARV = 668;
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15 static int NOKEY_ARV = 1023;
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16
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17 DFR_Key::DFR_Key()
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18 {
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19 _refreshRate = 10;
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20 _keyPin = DEFAULT_KEY_PIN;
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21 _threshold = DEFAULT_THRESHOLD;
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22 _keyIn = NO_KEY;
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23 _curInput = NO_KEY;
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24 _curKey = NO_KEY;
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25 _prevInput = NO_KEY;
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26 _prevKey = NO_KEY;
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27 _oldTime = 0;
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28 }
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29
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30 int DFR_Key::getKey()
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31 {
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32 if (millis() < _oldTime + _refreshRate) {
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33 return SAMPLE_WAIT;
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34 }
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35
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36 _prevInput = _curInput;
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37 _curInput = analogRead(_keyPin);
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38 _oldTime = millis();
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39
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40 if (_curInput != _prevInput) {
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41 // We could be in the middle of a key change
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42 return SAMPLE_WAIT;
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43 }
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44
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45 _prevKey = _curKey;
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46
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47 int curLo = _curInput - _threshold;
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48 int curHi = _curInput + _threshold;
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49 if ( curHi > UPKEY_ARV && curLo < UPKEY_ARV) _curKey = UP_KEY;
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50 else if ( curHi > DOWNKEY_ARV && curLo < DOWNKEY_ARV) _curKey = DOWN_KEY;
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51 else if ( curHi > RIGHTKEY_ARV && curLo < RIGHTKEY_ARV) _curKey = RIGHT_KEY;
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52 else if ( curHi > LEFTKEY_ARV && curLo < LEFTKEY_ARV) _curKey = LEFT_KEY;
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53 else if ( curHi > SELKEY_ARV && curLo < SELKEY_ARV) _curKey = SELECT_KEY;
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54 else _curKey = NO_KEY;
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55
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56 return _curKey;
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57 }
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58
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59 void DFR_Key::setRate(int rate)
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60 {
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61 _refreshRate = rate;
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62 }
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