int zuendSignal = 2; //Standard auf 5V, geht auf 0V bei Signal
volatile byte isIgn = 0; //FLAG byte für Zündsignal
int isrAllowed = 0;

//internal Simulator of ignition Signal
int millisBefore = 0;
int ignFlag = 0;

//for RPM Calculation
int ignSigMillisBefore = 0;
float rpm;

//MAP
int mapSensor = A1;


//Injector Actuating
int injector = 3;

//ignition Actuating
int ignition = 4;

void setup() {
  Serial.begin(2000000);
  
  pinMode(zuendSignal, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(zuendSignal), zuendISR, FALLING);
  pinMode(mapSensor, INPUT);
  pinMode(injector, OUTPUT);
  pinMode(ignition, OUTPUT);
}



void loop() {
  
      //this is for cycletime calculation
  int microsBeforeStartCycle = micros();
  int timeNow = millis();
//internal Ignition Signal Simulator...
  //Serial.println(timeNow);
  //Serial.println(millisBefore);
 if(timeNow>millisBefore+10) //10 ms makes real 11-12ms
  {
    int difference = timeNow-millisBefore;
    //Serial.println(difference); //just for time testing
    millisBefore = timeNow;
    ignFlag = 1;

  }

  //this is the fuel table which is called on every loop
  int fuelTable[5][15] = {
    {500,500,500,500,500,500,500,500,500,500,500,500,500,500,500},
    {500,500,500,500,500,500,500,500,500,500,500,500,500,500,500},
    {500,500,500,500,500,500,500,500,500,500,500,500,500,500,500},
    {500,500,500,500,500,500,500,500,500,500,500,500,500,500,500},
    {500,500,500,500,500,500,500,500,500,500,500,500,500,500,500}
  };

  //this is the MAP Sensor Scaling in mbar per mV
    float mapSensorScaling[2][2] = {

      {50, 1000},
      {100.0, 1000.0}

      };
    float mapSensorFunction =  (mapSensorScaling[1][1]-mapSensorScaling[1][0])/(mapSensorScaling[0][1]-mapSensorScaling[0][0]);
    //mapSensorFunction declares what pressure is applied at the ingoing voltage.


  //this is ignitionTable

  float ignitionTable[5][15] = {
    {30,30,30,30,30,30,30,25,25,20,20,15,15,10,10},
    {30,30,30,30,30,30,30,25,25,20,20,15,15,10,10},
    {30,30,30,30,30,30,30,25,25,20,20,15,15,10,10},
    {30,30,30,30,30,30,30,25,25,20,20,15,15,10,10},
    {30,30,30,30,30,30,30,25,25,20,20,15,15,10,10}

  };

  //this is fixed Angle Ignition Delay (set by Ignition Stator)
  float fixedDegree = 40.0;


//This is the routine that occurs on every ignition Signal
  if(ignFlag == 1)
  {

    //this is for RPM Calculation
    int ignSigMillisNow = millis();
    int revTime = ignSigMillisNow-ignSigMillisBefore;
    ignSigMillisBefore = ignSigMillisNow;
    rpm = (1000.0/revTime)*60.0;

    //now the MAP Value is read;
    int mapValueVoltage = analogRead(mapSensor);
    float mapValuePressure = mapValueVoltage*mapSensorFunction;
    

    //now the correct Injector duration is picked!!!!!!!!
    //first the parameters are declared in ranges
    int rpmRange = rpm/1000;
    int mapRange = mapValuePressure/100;

    //These are the real ranges to make sure that they dont oversize the fuel table size
    int realRpmRange = 0;
    int realMapRange = 0;
    if(rpmRange <= 14)
      realRpmRange = rpmRange;
    else realRpmRange = 14;
    if(mapRange <= 4)
      realMapRange = mapRange;
    else realMapRange = 4;

    //now the correct duration can be picked
    int injectorDurationMs = fuelTable[realMapRange][realRpmRange];
    int ignitionDelayDegree = fixedDegree - ignitionTable[realMapRange][realRpmRange];
    int ignitionDelayTime = (revTime*1000 / 360)*ignitionDelayDegree;
    
    //TIME: we are at PickUpSignal
    delayMicroseconds(ignitionDelayTime);
    
    //TIME: we are at Igniting
    digitalWrite(ignition, LOW);
    //delayMicroseconds(10);//this is ignition pulse time... please vary..
    digitalWrite(ignition, HIGH);
    
    delay((revTime/360)*ignitionTable[realMapRange][realRpmRange]); //waiting till TDC
    //TIME: we are at TDC
    delayMicroseconds(revTime*1000/2);
    //TIME: we are at BTC. Now we can start to inject
    //SOI
    
    digitalWrite(injector, HIGH);
    Serial.print("Injector open ");
    //Serial.println(micros());
    delayMicroseconds(injectorDurationMs);
    digitalWrite(injector, LOW);
    Serial.print("Injector closed ");
    //Serial.println(micros());
    //EOI
    
    

//This is for cycle time calculation. 
    int microsAfterCycle = micros();
    int cycleTime = microsAfterCycle-microsBeforeStartCycle;
    Serial.println(cycleTime);

  }



Serial.println("Check");
ignFlag = 0;

}

void zuendISR(){

  isIgn = 1;
}