int Received;

int i;
float temperature;
bool ok;
void setup(){
  InitUSART();
  DDRD = 0xFE;
  DDRB = 0x0F;
  TCCR2A |= (1<<COM2A1)| (1 << WGM20) | (1 << WGM21);
  TCCR2B |= (1<<CS22) | (1<CS21) | (1<<CS20); // prescaler 1024

  TCCR1A = 0;
  TCCR1B = 0;
  TCNT1 = 0;
  OCR1A = 15624;          //Formula pentru OCR1A:
                          //OCR1A = [16000000Hz/(1024*1Hz)]-1
  TCCR1B |= (1 << WGM12); //Mod CTC
  TCCR1B |= (1 << CS12) | (1 << CS10); //Prescaler 1024
  TIMSK1 |= (1 << OCIE1A); //Setare flag match
  sei(); //Activam intreruperile

}
void InitUSART()
{
    UBRR0 = 103; //BAUD 9600bps

    //Activare transmisie/receptie
    UCSR0B = (1<<RXEN0)|(1<<TXEN0);
    UCSR0C = (1<<USBS0)|(3<<UCSZ00); //8 data biti si 2 de stop
}

void loop(){
 S_A();

 PWM();
 if(TCNT1%512 == 0) //Facem ~2 citiri/secunda
      Temperature();
  delay(1);
}

void S_A(){
  unsigned char cRead = UDR0;
    if(cRead == 'A' || cRead == 'a')
      PORTB |= 0x04;
    else if(cRead == 'S' || cRead == 's')
      PORTB &= ~(0x04);
}

void segment(){
  PORTD = 0xEE;
  delay(1000);
  PORTD = 0x7A;
  delay(1000);
}

void PWM(){

  for (i = 0; i < 256; i++){
      OCR2A = i;
     _delay_ms(10);
    }

   for (i = 255; i; i--){
      OCR2A = i;
     _delay_ms(10);
    }
}

uint16_t ReadADC(uint8_t channel)
{
    ADMUX &= 0xF0;
    ADMUX |= channel;
    ADCSRA |= (1<<ADSC);
    while(ADCSRA & (1<<ADSC));
    return ADCW;
}

void Temperature(){
uint16_t nADC = ReadADC(0); //Citim CAN-ul
    //Conversia in grade C
    //Conversia nu se face ideal, desi formula e verificata
    //De mai multe ori (problema poate e la simulator)
    float temp = ((nADC*5.0/1024.0)-0.5)*100;
    //Variabilele pentru transmisie
    char intPart[5], fracPart[2];

    //Conversia intreg -> char a temperaturii
    itoa((int)temp, intPart, 10);
    itoa((int)(abs((temp-(int)temp))*100), fracPart, 10);
    strcat(intPart, ".");
    strcat(intPart, fracPart);
    strcat(intPart, "\n");

    //Conditionala cu histereza de 0.5 grade
    if(temp < 34.5)
      PORTB &= ~(0x02);
    else if(temp > 35.5)
      PORTB |= 0x02;

    //Transmisia temperaturii
    for(int i = 0; i < strlen(intPart); i++)
    {
       while (!(UCSR0A & (1<<UDRE0)));
       UDR0 = intPart[i];
    }
}

void adc_init() //adc initialization
{
  //set division factor between system clock frequency and the input clock to the ADC- 128
  ADCSRA |= ((1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0));
  ADMUX  |= (1  << REFS0); //AVcc with external capacitor at Aref pin
  ADCSRA |= (1  << ADEN); //enable ADC
  ADCSRA |= (1  << ADSC); //ADC start conversion
}

uint16_t read_adc(uint8_t channel)
{
  ADMUX &= 0xF0; //set input AO to A5
  ADMUX |= channel; //select chanel AO to A5
  ADCSRA |= (1<<ADSC); //start conversion
  while(ADCSRA & (1<<ADSC)); //wait while adc conversion are not updated
  return ADCW; //read and return voltage
}



ISR(TIMER1_COMPA_vect){
  PORTB ^= 0x08;
  if(ok == 0){
    ok = 1;
    PORTD =0xEE;
  }
  else{
    ok = 0;
    PORTD = 0x7A;

  }
}