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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>


int main()
{


int fd, retval, n;
char lett;
//char apriporta[5]={0x00,0x3E,0x64,0xE7,0x89};
//char rispondi_chiudi[5]={0x00,0xCC,0x64,0xE7,0x17};
//char occhio[5]={0x00,0x4F,0x64,0xE7,0x9A};


////////////////////////////////////////////////////////////////////////////////////////////
// Configurazione seriale

fd = open("/dev/ttyAMA0", O_RDWR);
 if (fd < 0)
  {
    printf ("Non posso aprire la porta seriale: /dev/ttyAMA0\n");
  }
		struct termios options;
		tcgetattr(fd, &options);
		options.c_cflag |= CREAD; //abilito ricezione
		options.c_cflag |= CSIZE + CS8; //8 caratteri
		cfsetispeed(&options, B1200); //boudrate 1200
		//options.c_lflag &= ~(ICANON | ECHO | ISIG); // disabilito terminatore
		tcsetattr(fd, TCSANOW, &options);
		tcflush(fd, TCIOFLUSH);
 

  char buf[256];
  
 while(1)
{


  n = read(fd, (void*)buf, 255);
  if (n < 0) {
    printf("\nRead failed");
    return -1;
  } else if (n == 0) printf("\nNo data on port");
  else {
    buf[n] = '\0';
    printf("\n%i bytes read : %s", n, buf);
  }
}

  close(fd);
  printf ("\n") ;
  return 0 ;
}//fine main