/*
 * File Name: XOR.h 
*/
            /***********************************************************************************************************************************
                                                       --------Truth Table for Quad 7486 XOR Chip----------
            /***********************************************************************************************************************************/  
                                               /* Input A   Input B | Output #1 Output #2 Output #3 Output #4
                                                    1         1     |    0         0         0         0      Test 1
                                                    1         0     |    1         1         1         1      Test 2
                                                    0         1     |    1         1         1         1      Test 3
                                                    0         0     |    0         0         0         0      Test 4
                                               */            
boolean XOR()
{
                                                                     /*      ------------      */  
                                                int xor_A1=FP;       /*  1A  |   \_/    | VCC  */  int xorVcc=FP+1;
                                                int xor_B1=FP+2;     /*  1B  |          | 4B   */  int xor_B4=FP+3;    
                                                int xor_R1=FP+4;     /*  1Y  |          | 4A   */  int xor_A4=FP+5;
                                                int xor_A2=FP+6;     /*  2A  |          | 4Y   */  int xor_R4=FP+7; 
                                                int xor_B2=FP+8;     /*  2B  |          | 3B   */  int xor_B3=FP+9;
                                                int xor_R2=FP+10;    /*  2Y  |          | 3A   */  int xor_A3=FP+11; 
                                                int xorGND=FP+12;    /*  GND |          | 3Y   */  int xor_R3=FP+13; 
                                                                     /*      ------------      */ 
                                                                             int xor_G1;
                                                                             int xor_G2;
                                                                             int xor_G3;
                                                                             int xor_G4;
                                                                         boolean test1 = false;
                                                                         boolean test2 = false;
                                                                         boolean test3 = false;
                                                                         boolean test4 = false;
          
                                                          pinMode(xor_A1, OUTPUT);  pinMode(xorVcc, OUTPUT);
                                                          pinMode(xor_B1, OUTPUT);  pinMode(xor_B4, OUTPUT);
                                                          pinMode(xor_R1, INPUT);   pinMode(xor_A4, OUTPUT);
                                                          pinMode(xor_A2, OUTPUT);  pinMode(xor_R4, INPUT);
                                                          pinMode(xor_B2, OUTPUT);  pinMode(xor_B3, OUTPUT);
                                                          pinMode(xor_R2, INPUT);   pinMode(xor_A3, OUTPUT);
                                                          pinMode(xorGND, OUTPUT);  pinMode(xor_R3, INPUT);
        
/**********************************************************************************
            ------------------------TEST 1------------------------
 **********************************************************************************/
        Serial.println("Testing with inputs 1 1");
        digitalWrite(xorGND, LOW); digitalWrite(xorVcc, HIGH);
        delay(readDelay);
        
        digitalWrite(xor_A1, HIGH); digitalWrite(xor_B1, HIGH);
        digitalWrite(xor_A2, HIGH); digitalWrite(xor_B2, HIGH);
        digitalWrite(xor_A3, HIGH); digitalWrite(xor_B3, HIGH);
        digitalWrite(xor_A4, HIGH); digitalWrite(xor_B4, HIGH);
        delay(readDelay);
        
        xor_G1 = digitalRead(xor_R1); Serial.print("Gate 1: "); Serial.print(xor_G1);
        xor_G2 = digitalRead(xor_R2); Serial.print("\nGate 2: "); Serial.print(xor_G2);
        xor_G3 = digitalRead(xor_R3); Serial.print("\nGate 3: "); Serial.print(xor_G3);
        xor_G4 = digitalRead(xor_R4); Serial.print("\nGate 4: "); Serial.print(xor_G4);
        
        if(xor_G1 == 0 && 
           xor_G2 == 0 && 
           xor_G3 == 0 && 
           xor_G4 == 0)
        {
          test1 = true;
        }   
        Serial.print("\nResult: ");
        Serial.println(test1);

/**********************************************************************************
            ------------------------TEST 2------------------------
 **********************************************************************************/
        Serial.println("Testing with inputs 1 0");
        digitalWrite(xorGND, LOW); digitalWrite(xorVcc, HIGH);
        delay(readDelay);

        digitalWrite(xor_A1, HIGH); digitalWrite(xor_B1, LOW);
        digitalWrite(xor_A2, HIGH); digitalWrite(xor_B2, LOW);
        digitalWrite(xor_A3, HIGH); digitalWrite(xor_B3, LOW);
        digitalWrite(xor_A4, HIGH); digitalWrite(xor_B4, LOW);
        delay(readDelay);

        xor_G1 = digitalRead(xor_R1); Serial.print("Gate 1: "); Serial.print(xor_G1);
        xor_G2 = digitalRead(xor_R2); Serial.print("\nGate 2: "); Serial.print(xor_G2);
        xor_G3 = digitalRead(xor_R3); Serial.print("\nGate 3: "); Serial.print(xor_G3);
        xor_G4 = digitalRead(xor_R4); Serial.print("\nGate 4: "); Serial.print(xor_G4);
        
        if(xor_G1 == 1 && 
           xor_G2 == 1 && 
           xor_G3 == 1 && 
           xor_G4 == 1)
        {
              test2 = true;
        } 
        Serial.print("\nResult: ");
        Serial.println(test2);
        
/**********************************************************************************
            ------------------------TEST 3------------------------
 **********************************************************************************/
        Serial.println("Testing with inputs 0 1");
        digitalWrite(xorGND, LOW); digitalWrite(xorVcc, HIGH);
        delay(readDelay);

        digitalWrite(xor_A1, LOW); digitalWrite(xor_B1, HIGH);
        digitalWrite(xor_A2, LOW); digitalWrite(xor_B2, HIGH);
        digitalWrite(xor_A3, LOW); digitalWrite(xor_B3, HIGH);
        digitalWrite(xor_A4, LOW); digitalWrite(xor_B4, HIGH);
        delay(readDelay);

        xor_G1 = digitalRead(xor_R1); Serial.print("Gate 1: "); Serial.print(xor_G1);
        xor_G2 = digitalRead(xor_R2); Serial.print("\nGate 2: "); Serial.print(xor_G2);
        xor_G3 = digitalRead(xor_R3); Serial.print("\nGate 3: "); Serial.print(xor_G3);
        xor_G4 = digitalRead(xor_R4); Serial.print("\nGate 4: "); Serial.print(xor_G4);
        
        if(xor_G1 == 1 && 
           xor_G2 == 1 && 
           xor_G3 == 1 && 
           xor_G4 == 1)
        {
              test3 = true;
        }
        Serial.print("\nResult: ");
        Serial.println(test3);

/**********************************************************************************
            ------------------------TEST 4------------------------
 **********************************************************************************/
        Serial.println("Testing with inputs 0 0");
        digitalWrite(xorGND, LOW); digitalWrite(xorVcc, HIGH);
        delay(readDelay);

        digitalWrite(xor_A1, LOW); digitalWrite(xor_B1, LOW);
        digitalWrite(xor_A2, LOW); digitalWrite(xor_B2, LOW);
        digitalWrite(xor_A3, LOW); digitalWrite(xor_B3, LOW);
        digitalWrite(xor_A4, LOW); digitalWrite(xor_B4, LOW);
        delay(readDelay);

        xor_G1 = digitalRead(xor_R1); Serial.print("Gate 1: "); Serial.print(xor_G1);
        xor_G2 = digitalRead(xor_R2); Serial.print("\nGate 2: "); Serial.print(xor_G2);
        xor_G3 = digitalRead(xor_R3); Serial.print("\nGate 3: "); Serial.print(xor_G3);
        xor_G4 = digitalRead(xor_R4); Serial.print("\nGate 4: "); Serial.print(xor_G4);
        
        if(xor_G1 == 0 && 
           xor_G2 == 0 && 
           xor_G3 == 0 && 
           xor_G4 == 0)
        {
          test4 = true;
        }   
        Serial.print("\nResult: ");
        Serial.println(test4);

/**********************************************************************************
            ------------------------XOR Results------------------------
 **********************************************************************************/
        if(test1 == true && 
           test2 == true && 
           test3 == true && 
           test4 == true)
        {
          test1 = test2 = test3 = test4 = false;
          return 1;
        }
        else
        {
          test1 = test2 = test3 = test4 = false;
          return 0;
        }
}
