char  inByte = 0;         // incoming serial byte
 
const int rtsPin = 16;
const int ctsPin = 17;
  
#include <SoftwareSerial.h>
  
char ChaineEmission[]="\r\nLe caractere envoye est ";
 
#define FIFOSIZE 32
char FifoBuffer[FIFOSIZE];
////////////////////////////////////////////
 
struct charFifo{
  char * data ;
  unsigned int fifo_size ;
  unsigned int write_index ;
  unsigned int read_index ;
  unsigned int nb_token_available ; 
};

struct charFifo myFifo;    // la variable FIFO à utiliser
////////////////////////////////////////////
void char_fifo_init(struct charFifo * pf, char * buf, unsigned int f_size){
   pf -> data = buf ;
   pf -> fifo_size = f_size ;
   pf -> write_index = 0 ;
   pf -> read_index = 0 ;
   pf -> nb_token_available = 0 ;
 }
//////////////////////////////////////////// 
 char write_char_fifo(struct charFifo * pf, const char token){
  if(pf->nb_token_available >= pf->fifo_size) return 0 ;
  pf->data[pf->write_index] = token ;
  pf->write_index = pf->write_index + 1;
  if(pf->write_index >= pf->fifo_size) pf->write_index = 0 ;
  pf->nb_token_available = pf->nb_token_available + 1 ;
  return 1 ;
}
//////////////////////////////////////////// 
 char read_char_fifo(struct charFifo * pf, char * ptr_token){
  if(pf->nb_token_available == 0) return 0;
  *ptr_token = pf->data[pf->read_index]  ;
  pf->read_index = pf->read_index + 1;
  if(pf->read_index >= pf->fifo_size) pf->read_index = 0 ;
  pf->nb_token_available = pf->nb_token_available -1 ;
  return 1 ;
 
}
//////////////////////////////////////////// 
 char peek_char_fifo(struct charFifo * pf, char * ptr_token){
  if(pf->nb_token_available == 0) return 0 ;
  *ptr_token = pf->data[pf->read_index]  ;
  return 1 ;
}
////////////////////////////////////////////

 
 
SoftwareSerial mySerial(5, 6); // uart soft avec les broches RX,TX
// http://arduino.cc/en/Reference/softwareSerial
 
//////////////////////////////////////////// 
void setup()
{
  pinMode(rtsPin, OUTPUT);      
  pinMode(ctsPin, INPUT);     
  Serial.begin(115200);  // start serial port at 115200 bps:
  Serial.print("Bonjour");       
  mySerial.begin(1200);  // set the data rate for the SoftwareSerial port
  mySerial.println("Hello, world?");
  char_fifo_init(&myFifo,FifoBuffer, FIFOSIZE);   //initialisation de la FIFO
  digitalWrite(rtsPin, 1);      //éteind la led RTS
}
//////////////////////////////////////////// 
 void RemplirFifo(char c)
 {
  //écrire tous les caractères de la chaine ChaineEmission + le caractère c et mettre RTS à 0 si débordement de la FIFO
  //à implémenter
 }
//////////////////////////////////////////// 
void loop()
{
   int i; 
    
 //réception du nouveau caractère
   if (Serial.available() != 0)
     {
    //à compléter
     }  
   //vidage de la FIFO
   if(read_char_fifo(&myFifo,&inByte)==1)
     {
    //à compléter
     }
     
}