deskthority

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/* Copyright (C) 2018 David M. Bednarski
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
ypconst int keyCount = 92;
const long keyMap[12][8] = {
  { KEYPAD_0,       KEYPAD_1,      KEYPAD_2,       KEYPAD_3,      KEYPAD_4,        KEYPAD_5,         KEYPAD_6,          KEYPAD_7         },
  { KEYPAD_8,       KEYPAD_9,      KEYPAD_ASTERIX, KEYPAD_PLUS,   KEYPAD_ENTER,    KEY_COMMA,        KEYPAD_PERIOD,     KEYPAD_ENTER     },
  { KEY_LEFT_BRACE, KEY_A,         KEY_B,          KEY_C,         KEY_D,           KEY_E,            KEY_F,             KEY_G            },
  { KEY_H,          KEY_I,         KEY_J,          KEY_K,         KEY_L,           KEY_M,            KEY_N,             KEY_O            },
  { KEY_P,          KEY_Q,         KEY_R,          KEY_S,         KEY_T,           KEY_U,            KEY_V,             KEY_W            },
  { KEY_X,          KEY_Y,         KEY_Z,          KEY_TILDE,     KEY_SLASH,       KEY_SLASH,        KEY_EQUAL,         KEY_MINUS        },
  { KEY_0,          KEY_1,         KEY_2,          KEY_3,         KEY_4,           KEY_5,            KEY_6,             KEY_7            },
  { KEY_8,          KEY_9,         KEY_QUOTE,      KEY_SEMICOLON, KEY_COMMA,       KEY_PERIOD,       KEY_SLASH,         KEY_BACKSLASH    },
  { KEY_DELETE,     KEY_UP,        KEY_RIGHT,      KEY_BACKSPACE, MODIFIERKEY_ALT, MODIFIERKEY_CTRL, MODIFIERKEY_SHIFT, MODIFIERKEY_CTRL },
  { KEY_ESC,        KEY_F1,        KEY_F2,         KEY_F3,        KEY_F4,          KEY_F5,           KEY_SPACE,         KEY_ESC          },
  { KEY_TAB,        KEY_DOWN,      KEY_LEFT,       KEY_INSERT,    KEY_ESC,         KEYPAD_MINUS,     KEYPAD_SLASH,      KEY_CAPS_LOCK    },
  { KEY_PAGE_UP,    KEY_PAGE_DOWN, 0,              0,             0,               0,                0,                 0                }
};

long keysHeld[keyCount];
long keysPressed[keyCount];

void setup() {
  // put your setup code here, to run once:

  // Signal pins
  pinMode(0, INPUT_PULLUP);
  pinMode(1, INPUT_PULLUP);
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  
  // Input pins
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);
  pinMode(7, INPUT_PULLUP);
  pinMode(8, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);

  Serial.begin(115200);
  Serial.println("hidave");
}

void addHeldKey(long key) {
    for(int i = 0; i < keyCount; i++) {
      
    if(keysHeld[i] == 0) {
      keysHeld[i] = key;
      Keyboard.release(key);
      break;
    }
  } 
}

void removeHeldKey(long key) {
    for(int i = 0; i < keyCount; i++) {
      if(keysHeld[i] == key) {
        keysHeld[i] = 0;
        break;
      }
  }
}

void readInputPins(int row) {
  int col = 0;

  // For each column pin
  for(int i = 4; i < 12; i++) {

    // If the key is pressed
    if(digitalRead(i) == LOW) {
      long key = keyMap[row][col]; 

      // Place it in an empty slot
      for(int j = 0; j < keyCount; j++) {    
        if(keysPressed[j] == 0) {
          keysPressed[j] = key;
          break;
        }
      }
    }
    col++;
  }
}

void queryRow(int row) {
    // Pin 0
    if(row == 0 or 
       row == 1 or 
       row == 2 or 
       row == 3 or 
       row == 4 or 
       row == 5 or 
       row == 6 or 
       row == 7) {
      pinMode(0, OUTPUT);
      digitalWrite(0, LOW);
    }

    // Pin 1
    if(row == 0 or 
       row == 1 or 
       row == 2 or 
       row == 3 or 
       row == 8 or 
       row == 9 or 
       row == 10 or 
       row == 11) {
      pinMode(1, OUTPUT);
      digitalWrite(1, LOW);
    }

    // Pin 2
    if(row == 0 or 
       row == 1 or 
       row == 4 or 
       row == 5 or 
       row == 8 or 
       row == 9) {
      pinMode(2, OUTPUT);
      digitalWrite(2, LOW);
    }

    // Pin 3
    if(row == 0 or 
       row == 2 or 
       row == 4 or 
       row == 6 or 
       row == 8 or
       row == 10) {
      pinMode(3, OUTPUT);
      digitalWrite(3, LOW);
    }

    readInputPins(row);

    // Revert pin to input
    pinMode(0, INPUT_PULLUP);   
    pinMode(1, INPUT_PULLUP);  
    pinMode(2, INPUT_PULLUP); 
    pinMode(3, INPUT_PULLUP);
}

void updateKeysPressed() {
  for(int i = 0; i < 12; i++) {
    queryRow(i);
  }
}

void clearKeysPressed() {
  for(int i = 0; i < keyCount; i++) {
    keysPressed[i] = 0;
  }
}

void updateKeysHeld() {
  long key;

  for(int i = 0; i < keyCount; i++) {
    key = keysPressed[i];

    if(key != 0) {
      if(checkForHeldKey(key) == false) {
        Serial.println(key);
        addHeldKey(key);
        Keyboard.press(key);
      }
    }
  }

  for(int i = 0; i < keyCount; i++) {
    key = keysHeld[i];

    if(key != 0) {
      if(checkForReleasedKey(key) == true) {
        removeHeldKey(key);
        Keyboard.release(key);
      }
    }
    
  }
}

bool checkForHeldKey(long key) {
  bool result = false;
  
  for(int i = 0; i < keyCount; i++) {
    if(keysHeld[i] == key and key != 0) {
      result = true;
      break;
    }
  }

  return result;
}

bool checkForReleasedKey(long key) {
  bool result = true;

  for(int i = 0; i < keyCount; i++) {
    if(keysPressed[i] == key and key != 0) {
      result = false;
      break;
    }
  }
  
  return result;
}

void loop() {
  // Clear out the old keys
  clearKeysPressed();
  
  // Load up the currently pressed keys
  updateKeysPressed();

  updateKeysHeld();

    
}