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#define Time 15
#define D_numPins 10
byte D_Pins[D_numPins] = {2, 3, 4, 6, 7,8,9,10,11,12};
#define A_numPins 4
byte A_Pins[A_numPins] = {A0, A1, A2, A3};
 
 
 
void setup() {
  // initialize serial 
  Serial.begin(57600);
 
  // initialize timer1 
  Initialize_Timer1(Time);
  // initialize serial 
  Initialize_GPIO();
}
 
 
void loop() {
  digitalWrite(11, LOW);
  digitalWrite(7, LOW);
 
  Write_Data_To_Pin(TCNT1);
 
  if (TIFR1 & 0x02){
    digitalWrite(12, HIGH);//Set Dx til high, for Test
  } else {
    digitalWrite(12, LOW);//Set Dx til low, for Test
  }
 
  if (Serial.available() > 0) {
    int inByte = Serial.read();
        switch (inByte) {
      case '1'://Enable Timer1 
        TCNT1  = 0;
        digitalWrite(7, HIGH);
        TIMSK1 |= (1 << OCIE1A);
        break;
      case '2'://Enable Timer1 and clear OCF1A flag
        TCNT1  = 0;
        digitalWrite(7, HIGH);
        TIFR1 |= (1 << OCF1A);
        TIMSK1 |= (1 << OCIE1A);
        break;
      case '3'://Disable Timer1 
        TCNT1  = 0;
        digitalWrite(7, HIGH);
        TIMSK1 &= ~(1 << OCIE1A);
        break;
 
      default:
          break;
        }
  }
 
}
void Initialize_Timer1(int _OCR1A_Value){
  noInterrupts();           // disable all interrupts
  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1  = 0;            
 
  OCR1A = _OCR1A_Value;      // compare match register Freq.
  TCCR1B |= (1 << WGM12);   // CTC mode, Mode=4
  TCCR1B |= (1 << CS10);    // 
  TCCR1B |= (1 << CS11);    // 
  TCCR1B |= (1 << CS12);    // CS12=1,CS11=1,CS10=1, External clock source on T1 pin. Clock on rising edge.
  TIMSK1 &= ~(1 << OCIE1A); // disable timer compare interrupt
  interrupts();             // enable all interrupts
}
 
 
void Initialize_GPIO(void){
  for(int i = 0; i < D_numPins; i++) {
    pinMode(D_Pins[i], OUTPUT);
    digitalWrite(D_Pins[i], LOW);
  }
 
  pinMode(5, INPUT);//Set D5, for Test
 
}
void Write_Data_To_Pin(int var){
    digitalWrite(2, HIGH && (var & 1));
    digitalWrite(3, HIGH && (var & 2));
    digitalWrite(4, HIGH && (var & 4));
    digitalWrite(6, HIGH && (var & 8));
   // digitalWrite(7, HIGH && (var & 16));
   // digitalWrite(8, HIGH && (var & 32));
   // digitalWrite(9, HIGH && (var & 64));
   // digitalWrite(10, HIGH && (var & 128));
}
ISR(TIMER1_COMPA_vect)          // timer compare interrupt service routine
{
   digitalWrite(11, HIGH);//Set Dx til high, for Test
}
 

prog.c:3:1: error: unknown type name 'byte'
 byte D_Pins[D_numPins] = {2, 3, 4, 6, 7,8,9,10,11,12};
 ^
prog.c:5:1: error: unknown type name 'byte'
 byte A_Pins[A_numPins] = {A0, A1, A2, A3};
 ^
prog.c:5:27: error: 'A0' undeclared here (not in a function)
 byte A_Pins[A_numPins] = {A0, A1, A2, A3};
                           ^
prog.c:5:31: error: 'A1' undeclared here (not in a function)
 byte A_Pins[A_numPins] = {A0, A1, A2, A3};
                               ^
prog.c:5:35: error: 'A2' undeclared here (not in a function)
 byte A_Pins[A_numPins] = {A0, A1, A2, A3};
                                   ^
prog.c:5:39: error: 'A3' undeclared here (not in a function)
 byte A_Pins[A_numPins] = {A0, A1, A2, A3};
                                       ^
prog.c: In function 'setup':
prog.c:11:3: error: 'Serial' undeclared (first use in this function)
   Serial.begin(57600);
   ^
prog.c:11:3: note: each undeclared identifier is reported only once for each function it appears in
prog.c:14:3: warning: implicit declaration of function 'Initialize_Timer1' [-Wimplicit-function-declaration]
   Initialize_Timer1(Time);
   ^
prog.c:16:3: warning: implicit declaration of function 'Initialize_GPIO' [-Wimplicit-function-declaration]
   Initialize_GPIO();
   ^
prog.c: In function 'loop':
prog.c:21:3: warning: implicit declaration of function 'digitalWrite' [-Wimplicit-function-declaration]
   digitalWrite(11, LOW);
   ^
prog.c:21:20: error: 'LOW' undeclared (first use in this function)
   digitalWrite(11, LOW);
                    ^
prog.c:24:3: warning: implicit declaration of function 'Write_Data_To_Pin' [-Wimplicit-function-declaration]
   Write_Data_To_Pin(TCNT1);
   ^
prog.c:24:21: error: 'TCNT1' undeclared (first use in this function)
   Write_Data_To_Pin(TCNT1);
                     ^
prog.c:26:7: error: 'TIFR1' undeclared (first use in this function)
   if (TIFR1 & 0x02){
       ^
prog.c:27:22: error: 'HIGH' undeclared (first use in this function)
     digitalWrite(12, HIGH);//Set Dx til high, for Test
                      ^
prog.c:32:7: error: 'Serial' undeclared (first use in this function)
   if (Serial.available() > 0) {
       ^
prog.c:38:9: error: 'TIMSK1' undeclared (first use in this function)
         TIMSK1 |= (1 << OCIE1A);
         ^
prog.c:38:25: error: 'OCIE1A' undeclared (first use in this function)
         TIMSK1 |= (1 << OCIE1A);
                         ^
prog.c:43:24: error: 'OCF1A' undeclared (first use in this function)
         TIFR1 |= (1 << OCF1A);
                        ^
prog.c: At top level:
prog.c:58:6: warning: conflicting types for 'Initialize_Timer1'
 void Initialize_Timer1(int _OCR1A_Value){
      ^
prog.c:14:3: note: previous implicit declaration of 'Initialize_Timer1' was here
   Initialize_Timer1(Time);
   ^
prog.c: In function 'Initialize_Timer1':
prog.c:59:3: warning: implicit declaration of function 'noInterrupts' [-Wimplicit-function-declaration]
   noInterrupts();           // disable all interrupts
   ^
prog.c:60:3: error: 'TCCR1A' undeclared (first use in this function)
   TCCR1A = 0;
   ^
prog.c:61:3: error: 'TCCR1B' undeclared (first use in this function)
   TCCR1B = 0;
   ^
prog.c:62:3: error: 'TCNT1' undeclared (first use in this function)
   TCNT1  = 0;            
   ^
prog.c:64:3: error: 'OCR1A' undeclared (first use in this function)
   OCR1A = _OCR1A_Value;      // compare match register Freq.
   ^
prog.c:65:19: error: 'WGM12' undeclared (first use in this function)
   TCCR1B |= (1 << WGM12);   // CTC mode, Mode=4
                   ^
prog.c:66:19: error: 'CS10' undeclared (first use in this function)
   TCCR1B |= (1 << CS10);    // 
                   ^
prog.c:67:19: error: 'CS11' undeclared (first use in this function)
   TCCR1B |= (1 << CS11);    // 
                   ^
prog.c:68:19: error: 'CS12' undeclared (first use in this function)
   TCCR1B |= (1 << CS12);    // CS12=1,CS11=1,CS10=1, External clock source on T1 pin. Clock on rising edge.
                   ^
prog.c:69:3: error: 'TIMSK1' undeclared (first use in this function)
   TIMSK1 &= ~(1 << OCIE1A); // disable timer compare interrupt
   ^
prog.c:69:20: error: 'OCIE1A' undeclared (first use in this function)
   TIMSK1 &= ~(1 << OCIE1A); // disable timer compare interrupt
                    ^
prog.c:70:3: warning: implicit declaration of function 'interrupts' [-Wimplicit-function-declaration]
   interrupts();             // enable all interrupts
   ^
prog.c: At top level:
prog.c:74:6: warning: conflicting types for 'Initialize_GPIO'
 void Initialize_GPIO(void){
      ^
prog.c:16:3: note: previous implicit declaration of 'Initialize_GPIO' was here
   Initialize_GPIO();
   ^
prog.c: In function 'Initialize_GPIO':
prog.c:76:5: warning: implicit declaration of function 'pinMode' [-Wimplicit-function-declaration]
     pinMode(D_Pins[i], OUTPUT);
     ^
prog.c:76:24: error: 'OUTPUT' undeclared (first use in this function)
     pinMode(D_Pins[i], OUTPUT);
                        ^
prog.c:77:29: error: 'LOW' undeclared (first use in this function)
     digitalWrite(D_Pins[i], LOW);
                             ^
prog.c:80:14: error: 'INPUT' undeclared (first use in this function)
   pinMode(5, INPUT);//Set D5, for Test
              ^
prog.c: At top level:
prog.c:83:6: warning: conflicting types for 'Write_Data_To_Pin'
 void Write_Data_To_Pin(int var){
      ^
prog.c:24:3: note: previous implicit declaration of 'Write_Data_To_Pin' was here
   Write_Data_To_Pin(TCNT1);
   ^
prog.c: In function 'Write_Data_To_Pin':
prog.c:84:21: error: 'HIGH' undeclared (first use in this function)
     digitalWrite(2, HIGH && (var & 1));
                     ^
prog.c: At top level:
prog.c:93:1: warning: return type defaults to 'int' [-Wimplicit-int]
 ISR(TIMER1_COMPA_vect)          // timer compare interrupt service routine
 ^
prog.c: In function 'ISR':
prog.c:93:1: warning: type of 'TIMER1_COMPA_vect' defaults to 'int' [-Wimplicit-int]
prog.c:95:21: error: 'HIGH' undeclared (first use in this function)
    digitalWrite(11, HIGH);//Set Dx til high, for Test
                     ^
prog.c:96:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty