int RAM_Addr0 = A0;
int RAM_Addr1 = A1;
int RAM_Addr2 = A2;
int RAM_Addr3 = A3;
int RAM_Addr4 = A4;
int RAM_Addr5 = A5;
int RAM_Addr6 = A6;
int RAM_Addr7 = A7;

int RAM_Data0 = A8;
int RAM_Data1 = A9;
int RAM_Data2 = A10;
int RAM_Data3 = A11;
int RAM_Data4 = A12;
int RAM_Data5 = A13;
int RAM_Data6 = A14;
int RAM_Data7 = A15;

int analogPin_H = 650;

int val0 = 0; // Variable, die den gelesenen Wert speichert
int val1 = 0; // Variable, die den gelesenen Wert speichert
int val2 = 0; // Variable, die den gelesenen Wert speichert
int val3 = 0; // Variable, die den gelesenen Wert speichert
int val4 = 0; // Variable, die den gelesenen Wert speichert
int val5 = 0; // Variable, die den gelesenen Wert speichert
int val6 = 0; // Variable, die den gelesenen Wert speichert
int val7 = 0; // Variable, die den gelesenen Wert speichert

void readBus(int bus_size, char debug)
{
  unsigned char byte = 0;

  for(int i=0;i <= bus_size;i++)
  {
    switch(i)
    {
      case 0:
        val0 = analogRead(RAM_Data0); // Pin einlesen
        if(debug == 0x01) Serial.println(val0);
        if(val0 > analogPin_H) byte += 0x01;
        break;
      case 1:
        val1 = analogRead(RAM_Data1);// Pin einlesen
        if(debug == 0x01) Serial.println(val1);
        if(val1 > analogPin_H) byte += 0x02;
        break;
      case 2:
        val2 = analogRead(RAM_Data2); // Pin einlesen
        if(debug == 0x01) Serial.println(val2);
        if(val2 > analogPin_H) byte += 0x04;
        break;
      case 3:
        val3 = analogRead(RAM_Data3); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val3 > analogPin_H) byte += 0x08;
        break;
      case 4:
        val4 = analogRead(RAM_Data4); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val4 > analogPin_H) byte += 0x10;
        break;
      case 5:
        val5 = analogRead(RAM_Data5); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val5 > analogPin_H) byte += 0x20;
        break;
      case 6:
        val6 = analogRead(RAM_Data6); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val6 > analogPin_H) byte += 0x40;
        break;
      case 7:
        val7 = analogRead(RAM_Data7); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val7 > analogPin_H) byte += 0x80;
        break;        
    }
  }

  Serial.print("0x");
  Serial.println(byte, HEX);

}

void readRAMAddr(int bus_size, char debug)
{
  unsigned char byte = 0;

  for(int i=0;i <= bus_size;i++)
  {
    switch(i)
    {
      case 0:
        val0 = analogRead(RAM_Addr0); // Pin einlesen
        if(debug == 0x01) Serial.println(val0);
        if(val0 > analogPin_H) byte += 0x01;
        break;
      case 1:
        val1 = analogRead(RAM_Addr1);// Pin einlesen
        if(debug == 0x01) Serial.println(val1);
        if(val1 > analogPin_H) byte += 0x02;
        break;
      case 2:
        val2 = analogRead(RAM_Addr2); // Pin einlesen
        if(debug == 0x01) Serial.println(val2);
        if(val2 > analogPin_H) byte += 0x04;
        break;
      case 3:
        val3 = analogRead(RAM_Addr3); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val3 > analogPin_H) byte += 0x08;
        break;
      case 4:
        val4 = analogRead(RAM_Addr4); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val4 > analogPin_H) byte += 0x10;
        break;
      case 5:
        val5 = analogRead(RAM_Addr5); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val5 > analogPin_H) byte += 0x20;
        break;
      case 6:
        val6 = analogRead(RAM_Addr6); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val6 > analogPin_H) byte += 0x40;
        break;
      case 7:
        val7 = analogRead(RAM_Addr7); // Pin einlesen
        if(debug == 0x01) Serial.println(val3);
        if(val7 > analogPin_H) byte += 0x80;
        break;        
    }
  }

  Serial.print("0x");
  Serial.println(byte, HEX);

}


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

  pinMode(RAM_Addr0, INPUT);
  pinMode(RAM_Addr1, INPUT);
  pinMode(RAM_Addr2, INPUT);
  pinMode(RAM_Addr3, INPUT);
  pinMode(RAM_Addr4, INPUT);
  pinMode(RAM_Addr5, INPUT);
  pinMode(RAM_Addr6, INPUT);
  pinMode(RAM_Addr7, INPUT);

  pinMode(RAM_Data0, INPUT);
  pinMode(RAM_Data1, INPUT);
  pinMode(RAM_Data2, INPUT);
  pinMode(RAM_Data3, INPUT);
  pinMode(RAM_Data4, INPUT);
  pinMode(RAM_Data5, INPUT);
  pinMode(RAM_Data6, INPUT);
  pinMode(RAM_Data7, INPUT);

  Serial.begin(9600);

}

void loop() {

  //Serial.println("Starte Programm:");
  delay(1000);
  
  Serial.print("Lese: ");
  readBus(8, 0x00);
  Serial.print("an Adresse: ");
  readRAMAddr(8,0x00);
  Serial.println();

   if (Serial.available() > 0) {
    // Lies das eingehende Byte:
    //SerialIncoming = Serial.read();
    
    String buffer = Serial.readString();
    
    // Ausgeben:
    Serial.print("I received: ");
    Serial.println(buffer);

    

    if(buffer.compareTo("setdata\n") == 0)
    {
      Serial.println("Schreibe 0xFF");

      pinMode(RAM_Data0, OUTPUT);
      digitalWrite(RAM_Data0, HIGH);
      pinMode(RAM_Data1, OUTPUT);
      digitalWrite(RAM_Data1, HIGH);
      pinMode(RAM_Data2, OUTPUT);
      digitalWrite(RAM_Data2, HIGH);
      pinMode(RAM_Data3, OUTPUT);
      digitalWrite(RAM_Data3, HIGH);
      pinMode(RAM_Data4, OUTPUT);
      digitalWrite(RAM_Data4, HIGH);
      pinMode(RAM_Data5, OUTPUT);
      digitalWrite(RAM_Data5, HIGH);
      pinMode(RAM_Data6, OUTPUT);
      digitalWrite(RAM_Data6, HIGH);
      pinMode(RAM_Data7, OUTPUT);
      digitalWrite(RAM_Data7, HIGH);

      Serial.println("Warte 4 Sekunden");
      delay(4000);

      pinMode(RAM_Data0, INPUT);
      pinMode(RAM_Data1, INPUT);
      pinMode(RAM_Data2, INPUT);
      pinMode(RAM_Data3, INPUT);
      pinMode(RAM_Data4, INPUT);
      pinMode(RAM_Data5, INPUT);
      pinMode(RAM_Data6, INPUT);
      pinMode(RAM_Data7, INPUT);
  
    }
   }

  //Serial.println(analogRead(RAM_Data0));
  // put your main code here, to run repeatedly:
  

}