const int pinSw     = 2; //入力スイッチ

//7セグピン
const int pin7segA  = 6;
const int pin7segB  = 7;
const int pin7segC  = 8;
const int pin7segD  = 9;
const int pin7segE  = 10;
const int pin7segF  = 12;
const int pin7segG  = 13;

//7セグ桁制御
const int pin7segDig4 = 5;
const int pin7segDig3 = 3;


//エッジ検出
int swPrevState = 0;  //1つ前のスイッチ状態
int swCurrState = 0;  //現在のスイッチ状態
int detectUpEdge  = 0;  //立ち上がりエッジ検出

//スイッチカウンター値
int ctSw = 0;

//時間
long timeNow;  //現在時刻
long timeStart = millis();  //タイマー開始時刻
long timeDisp;  //表示時刻
int  numDisp[2];  //LEDに表示する数字
int  i;


void setup()
{
  //入出力の初期化
  pinMode( pinSw, INPUT );
  pinMode( pin7segA,  OUTPUT );
  pinMode( pin7segB,  OUTPUT );
  pinMode( pin7segC,  OUTPUT );
  pinMode( pin7segD,  OUTPUT );
  pinMode( pin7segE,  OUTPUT );
  pinMode( pin7segF,  OUTPUT );
  pinMode( pin7segG,  OUTPUT );
  pinMode( pin7segDig4,  OUTPUT );
  pinMode( pin7segDig3,  OUTPUT );
  
  //デバッグ用シリアル
  Serial.begin(9600);

}

void loop()
{
  //立ち上がりエッジ検出
  swCurrState = digitalRead(pinSw); //現在のスイッチ状態
  if( swCurrState==HIGH && swCurrState!=swPrevState ) //現在のスイッチ状態と一つ前のスイッチ状態を比較
    detectUpEdge = 1;
  else
    detectUpEdge = 0;
  swPrevState = swCurrState; //一つ前のスイッチ状態
  
  //表示時刻の取得
  if( detectUpEdge == 1 ) //スイッチが押された場合はタイマー開始時刻をリセット
    timeStart = millis();
    timeNow = millis();  //現在時刻の取得
  
  timeDisp = ( (timeNow-timeStart)/1000 );  //開始時刻と現在時刻の差が表示時刻
  for( i=0; i<2; i++ ){  //表示時刻から桁表示の数字を求める
    numDisp[i] = timeDisp % 10;
    timeDisp = timeDisp / 10;
  }
   
  //7セグLEDの制御
  for( i=0; i<2; i++ ){
    switch(i){
      case 1:
        digitalWrite(pin7segDig4  , HIGH  );
        digitalWrite(pin7segDig3  , LOW   );
        break;
    
     default :
        digitalWrite(pin7segDig4  , LOW   );
        digitalWrite(pin7segDig3  , HIGH  );
        break;
    }

    switch(numDisp[i]){
      case 1:
        digitalWrite(pin7segA  , LOW  );
        digitalWrite(pin7segB  , HIGH );
        digitalWrite(pin7segC  , HIGH );
        digitalWrite(pin7segD  , LOW  );
        digitalWrite(pin7segE  , LOW  );
        digitalWrite(pin7segF  , LOW  );
        digitalWrite(pin7segG  , LOW  );
        break;
    
      case 2:
        digitalWrite(pin7segA  , HIGH );
        digitalWrite(pin7segB  , HIGH );
        digitalWrite(pin7segC  , LOW  );
        digitalWrite(pin7segD  , HIGH );
        digitalWrite(pin7segE  , HIGH );
        digitalWrite(pin7segF  , LOW  );
        digitalWrite(pin7segG  , HIGH );
        break;
    
      case 3:
        digitalWrite(pin7segA  , HIGH );
        digitalWrite(pin7segB  , HIGH );
        digitalWrite(pin7segC  , HIGH );
        digitalWrite(pin7segD  , HIGH );
        digitalWrite(pin7segE  , LOW  );
        digitalWrite(pin7segF  , LOW  );
        digitalWrite(pin7segG  , HIGH );
        break;
    
      case 4:
        digitalWrite(pin7segA  , LOW  );
        digitalWrite(pin7segB  , HIGH );
        digitalWrite(pin7segC  , HIGH );
        digitalWrite(pin7segD  , LOW  );
        digitalWrite(pin7segE  , LOW  );
        digitalWrite(pin7segF  , HIGH );
        digitalWrite(pin7segG  , HIGH );
        break;
    
      case 5:
        digitalWrite(pin7segA  , HIGH );
        digitalWrite(pin7segB  , LOW  );
        digitalWrite(pin7segC  , HIGH );
        digitalWrite(pin7segD  , HIGH );
        digitalWrite(pin7segE  , LOW  );
        digitalWrite(pin7segF  , HIGH );
        digitalWrite(pin7segG  , HIGH );
        break;
    
      case 6:
        digitalWrite(pin7segA  , HIGH );
        digitalWrite(pin7segB  , LOW  );
        digitalWrite(pin7segC  , HIGH );
        digitalWrite(pin7segD  , HIGH );
        digitalWrite(pin7segE  , HIGH );
        digitalWrite(pin7segF  , HIGH );
        digitalWrite(pin7segG  , HIGH );
        break;
    
      case 7:
        digitalWrite(pin7segA  , HIGH );
        digitalWrite(pin7segB  , HIGH );
        digitalWrite(pin7segC  , HIGH );
        digitalWrite(pin7segD  , LOW  );
        digitalWrite(pin7segE  , LOW  );
        digitalWrite(pin7segF  , HIGH );
        digitalWrite(pin7segG  , LOW  );
        break;
    
      case 8:
        digitalWrite(pin7segA  , HIGH );
        digitalWrite(pin7segB  , HIGH );
        digitalWrite(pin7segC  , HIGH );
        digitalWrite(pin7segD  , HIGH );
        digitalWrite(pin7segE  , HIGH );
        digitalWrite(pin7segF  , HIGH );
        digitalWrite(pin7segG  , HIGH );
        break;
    
      case 9:
        digitalWrite(pin7segA  , HIGH );
        digitalWrite(pin7segB  , HIGH );
        digitalWrite(pin7segC  , HIGH );
        digitalWrite(pin7segD  , HIGH );
        digitalWrite(pin7segE  , LOW  );
        digitalWrite(pin7segF  , HIGH );
        digitalWrite(pin7segG  , HIGH );
        break;
    
      default :  //0
        digitalWrite(pin7segA  , HIGH );
        digitalWrite(pin7segB  , HIGH );
        digitalWrite(pin7segC  , HIGH );
        digitalWrite(pin7segD  , HIGH );
        digitalWrite(pin7segE  , HIGH );
        digitalWrite(pin7segF  , HIGH );
        digitalWrite(pin7segG  , LOW  );
        break;
    }

    delay(5);
  }
}