#include <avr/io.h>			// for the input/output register
  #include <avr/interrupt.h> 	
  #include <util/delay.h>  

  #include <string.h>

  #include <stdio.h>

  #include <stdlib.h>

  #define PRESCALER 1024
  #define TIME_SLOT 20

  #define BAUDRATE	103
  

  #define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
  #define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))

  char Donnee[24];
  float temp;

  
  void init_serial(void)
  {
  	/* ACHTUNG : we suppose UBRR value < 0xff */
  	/* Not true in all case */
  	uint8_t baudrate = BAUDRATE;
  	/* Set baud rate */
  	UBRR0H = 0;
  	UBRR0L = baudrate;

  	/* Enable transmitter *///task_led_red();
        //task_send_serial('A');
  	UCSR0B = (1<<TXEN0);

  	/* Set frame format */
  	UCSR0C = 0x06;
      
  }
  

  void send_serial(unsigned char c)
  {
  	loop_until_bit_is_set(UCSR0A, UDRE0);
  	UDR0 = c;
  }
  
  
  void send_msg2(char Donnee[]){
   
      while (( UCSR0A & (1<<UDRE0))  == 0){};
              
              for (int i = 0; i < strlen(Donnee); i++){ 
                  while (( UCSR0A & (1<<UDRE0))  == 0){};
                  UDR0 = Donnee[i]; 
                  if (i == (strlen(Donnee) - 1)){
                      send_serial('\n');
                      send_serial('\r');
                  }
              } 
  }
  
  void send_msg(char Donnee[]){
          int i=0;
        for(i=0; i<strlen(Donnee); i++){
            if (i==strlen(Donnee)-1){
                send_serial(Donnee[i]);
                send_serial('\n');
                send_serial('\r');
          }
            else{
                send_serial(Donnee[i]);
          } 
          _delay_ms(100);
          }
  }

  
  // équivalent de analogueRead()
  int analogReadNew(uint8_t pin) {
    /*
    // Définition de la référence de tension
    ADMUX |= (1 << REFS0);
    // On sélectionne notre pin
    ADMUX |= pin & 0x07;
    
    // On lance la conversion
    sbi(ADCSRA, ADSC);
  
    // Le bit sera désactivé à la fin de la conversion
    while(bit_is_set(ADCSRA, ADSC));
  
    // Lire ADCL en premier est obligatoire, sinon l'ADC se bloque
    uint8_t low = ADCL;
  
    // Récupérer le résultat
    return ((ADCH << 8) | low);
    */
    ADCSRA |= (1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0);
    ADMUX |= (1<<REFS0)|(1<<ADLAR);
    ADMUX = (ADMUX&0xf0)|pin;
    ADCSRA |= (1<<ADEN);
    
    ADCSRA |= (1<<ADSC);
    while(bit_is_set(ADCSRA, ADSC));
    return ADCH;
  }
  
  int main()

  {

     int reading;

     init_serial();
     while(1){

      reading=analogReadNew(0);
      temp = reading * 1.9607843;
      dtostrf(temp, 4, 1, Donnee);
      send_serial('T');
      send_serial('=');
      send_msg2(Donnee);
      _delay_ms(2000);
     }
     return 0;  

  }