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Please read the instructions on how to post source code:
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void envoi_data(void)
{

int i; printf ("Debut de transmission\r\n\r\n"); printf ("Toutes les valeur sont en volts\r\n\r\n"); for(i=0;i<9/* message[i]!='\0'*/;i++) { printf ("\r Resultat de conversion: %.12f\n\r",message[i]);} printf("\n\r la transmission est terminee!!!\r\n\r"); printf("\n\r-----------Au Revoir------------\r\n\r"); printf ("\r\n\r\n"); printf ("||****************************************||"); printf ("\r\n\r\n");

}
-------------------------------------------------------

void main (void)
{ choix_voie=0; init_system(); setup_SPI(); com_initialize (); /* initialize interrupt driven serial I/O */ mux_voie() ; //configuration du switch

EAI=1; // enable Auxiliary interrupts EA = 1;

while (1) { if(transfert==1){PDCON = PDCON& 0xFF; hexa_decimal(); envoi_data(); transfert=0; PDCON = PDCON& 0xFE;}
} }

Hmm... do you call that legible?

Did it look OK in the preview?

Illegible source code and a quite general thread title doesn't directly improve on the chances of getting qualified help.

Here is the formated code usinf pre and /pre tags

Now what was the question?

void envoi_data(void)
{

   int i;
   printf ("Debut de transmission\r\n\r\n");
   printf ("Toutes les valeur sont en volts\r\n\r\n");
   for(i=0;i<9/* message[i]!='\0'*/;i++)
   {
      printf ("\r Resultat de conversion:%.12f\n\r",message[i]);
   }
   printf("\n\r la transmission est terminee!!!\r\n\r");
   printf("\n\r-----------Au Revoir------------\r\n\r");
   printf ("\r\n\r\n");
   printf ("||****************************************||");
   printf ("\r\n\r\n");

}
-------------------------------------------------------

void main (void)
{
   choix_voie=0;
   init_system();
   setup_SPI();
   com_initialize ();   /* initialize interrupt driven serial I/O */
   mux_voie() ;         //configuration du switch

   EAI=1;               // enable Auxiliary interrupts EA = 1;

   while (1)
   {
      if(transfert==1)
      {
         PDCON = PDCON& 0xFF;
         hexa_decimal();
         envoi_data();
         transfert=0;
         PDCON = PDCON& 0xFE;
      }
    }
}
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