#define BAUD 115200

//Pin connected to ST_CP of 74HC595
int latchPin = 13;
//Pin connected to SH_CP of 74HC595
int clockPin = 12;
////Pin connected to DS of 74HC595
int dataPin = 11;

byte min1=0;
byte min0=0;

byte hora1=0;
byte hora0=0;

byte dia1=0;
byte dia0=0;

byte mes1=0;
byte mes0=0;

byte year_a0=0;
byte year_a1=0;

byte year_b1=0;
byte year_b0=0;

byte minuto=0;
byte hora=0;
byte dia=1;
byte mes=1;
byte year_a=0;
byte year_b=0;
int year=2012;
byte time=60;
byte res=1;

byte ready = true;

byte display0[10]= {119,65,59,107,77,110,126,67,127,111}; 

ISR(TIMER2_OVF_vect) {
  sei(); //Reenable global interrupts, otherwise serial commands will get dropped
  if( Serial.available() > 7 ) {
    if (Serial.read()==0xF0){
      year_a=Serial.read();
      year_b=Serial.read();
      year=year_a*100+year_b;
      mes=Serial.read();
      dia=Serial.read();
      hora=Serial.read();
      minuto=Serial.read();
      min1=minuto/10;
      min0=minuto%10;
      time=Serial.read();   
      res=Serial.read(); 
      digitalWrite(latchPin, 0);
      
      shiftOut(dataPin, clockPin, display0[dia1]); 
      shiftOut(dataPin, clockPin, display0[dia0]);
      shiftOut(dataPin, clockPin, display0[mes1]); 
      shiftOut(dataPin, clockPin, display0[mes0]); 
      shiftOut(dataPin, clockPin, display0[year_a1]); 
      shiftOut(dataPin, clockPin, display0[year_a0]); 
      shiftOut(dataPin, clockPin, display0[year_b1]); 
      shiftOut(dataPin, clockPin, display0[year_b0]); 
      shiftOut(dataPin, clockPin, display0[hora1]); 
      shiftOut(dataPin, clockPin, display0[hora0]); 
      shiftOut(dataPin, clockPin, display0[min1]); 
      shiftOut(dataPin, clockPin, display0[min0]); 

      digitalWrite(latchPin, 1); 
      
      //Serial.print("Minutos: ");
      //minuto=(min1*10)+(min0);
      //Serial.print(minuto);
      //Serial.print(" Tiempo ficcion: ");
      //Serial.print(time);
    
    }
  }
}

void setup() {
  //Start Serial for debuging purposes	
  Serial.begin(BAUD);
  //set pins to output because they are addressed in the main loop
  pinMode(latchPin, OUTPUT);
  
  TCCR2A = 0;
  TCCR2B = 0<<CS22 | 1<<CS21 | 1<<CS20;

  //Timer2 Overflow Interrupt Enable
  TIMSK2 = 1<<TOIE2;

  year_a=year/100;
  year_b=year%100;
  
}

void loop() {
  //count up routine

  
  for (min0 = 0; min0 < 10; min0++) {
    //ground latchPin and hold low for as long as you are transmitting
    
    hora1=hora/10;
    hora0=hora%10;
    dia1=dia/10;
    dia0=dia%10;
    mes1=mes/10;
    mes0=mes%10;
    year_a1=year_a/10;
    year_a0=year_a%10;
    year_b1=year_b/10;
    year_b0=year_b%10;
    
    digitalWrite(latchPin, 0);
    //count up on GREEN LEDs
    
    shiftOut(dataPin, clockPin, display0[dia1]); 
    shiftOut(dataPin, clockPin, display0[dia0]);
    shiftOut(dataPin, clockPin, display0[mes1]); 
    shiftOut(dataPin, clockPin, display0[mes0]); 
    shiftOut(dataPin, clockPin, display0[year_a1]); 
    shiftOut(dataPin, clockPin, display0[year_a0]); 
    shiftOut(dataPin, clockPin, display0[year_b1]); 
    shiftOut(dataPin, clockPin, display0[year_b0]); 
    shiftOut(dataPin, clockPin, display0[hora1]); 
    shiftOut(dataPin, clockPin, display0[hora0]); 
    shiftOut(dataPin, clockPin, display0[min1]); 
    shiftOut(dataPin, clockPin, display0[min0]); 
    //count down on RED LEDs
    //shiftOut(dataPin, clockPin, 255-j);
    //return the latch pin high to signal chip that it 
    //no longer needs to listen for information
    digitalWrite(latchPin, 1);
    
    //Serial.print("Minutos: ");
    Serial.print(0xF0,BYTE);
    Serial.print(year_a);
    Serial.print(year_b);
    Serial.print(mes);
    Serial.print(dia);
    Serial.print(hora);
    minuto=(min1*10)+(min0);
    Serial.print(minuto);
    //Serial.print(" Tiempo ficcion: ");
    Serial.print(time);
    
    for (int i= 1; i <= time; i++) delay(res*10);
    
  
  }
  min1++;
  
  if (min1==6) 
  {
    min1=0;
    hora=hora+1;
  }
  if (hora==24) 
  {
    hora=0;
    dia=dia+1;
  }
  switch (mes) 
  {
    case 1:
     if (dia==32)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
     
    case 2:
     if (dia==29)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 3:
     if (dia==32)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 4:
     if (dia==31)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 5:
     if (dia==32)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 6:
     if (dia==31)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 7:
     if (dia==32)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 8:
     if (dia==32)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 9:
     if (dia==31)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 10:
     if (dia==32)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 11:
     if (dia==31)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
    
    case 12:
     if (dia==32)
     {
      dia=1;
      mes=mes+1;
     } 
    break;
  }
  if (mes>12)
     {
      mes=1;
      year=year+1;
      year_a=year/100;
      year_b=year%100;
     } 
}

void shiftOut(int myDataPin, int myClockPin, byte myDataOut) {
  // This shifts 8 bits out MSB first, 
  //on the rising edge of the clock,
  //clock idles low

//internal function setup
  int i=0;
  int pinState;
  pinMode(myClockPin, OUTPUT);
  pinMode(myDataPin, OUTPUT);

//clear everything out just in case to
//prepare shift register for bit shifting
  digitalWrite(myDataPin, 0);
  digitalWrite(myClockPin, 0);

  //for each bit in the byte myDataOut…
  //NOTICE THAT WE ARE COUNTING DOWN in our for loop
  //This means that %00000001 or "1" will go through such
  //that it will be pin Q0 that lights. 
  for (i=7; i>=0; i--)  {
    digitalWrite(myClockPin, 0);

    //if the value passed to myDataOut and a bitmask result 
    // true then... so if we are at i=6 and our value is
    // %11010100 it would the code compares it to %01000000 
    // and proceeds to set pinState to 1.
    if ( myDataOut & (1<<i) ) {
      pinState= 1;
    }
    else {	
      pinState= 0;
    }

    //Sets the pin to HIGH or LOW depending on pinState
    digitalWrite(myDataPin, pinState);
    //register shifts bits on upstroke of clock pin  
    digitalWrite(myClockPin, 1);
    //zero the data pin after shift to prevent bleed through
    digitalWrite(myDataPin, 0);
  }

  //stop shifting
  digitalWrite(myClockPin, 0);
}