serial_old.pl - The first version of the program
================================================

#!/usr/bin/perl -w

# Routines

# comunicate: adds a customary terminator to the string, which is then sent to
# the serial port, the standard output and the logfile; finally it reads the 
# reply coming from the serial port and prints it on the standard output and
# the logfile

sub comunicate{
    $terminator = "\n";
    $stringout = $_[0].$terminator;
    print PORTA $stringout;
    print "Sent: $stringout\n";
    print FOUT "Sent: $stringout\n";
    ascspell($stringout);
    $answer = <PORTA>;
    print "Received: $answer\n";
    print FOUT "Received: $answer\n";
    ascspell($answer);
}

# ascspell: displays the ASCII codes for each character in a given string

sub ascspell{
    @array = unpack("C*", $_[0]);
    print "[";
    foreach $ch (@array) {
            print "$ch ";
            print FOUT "$ch ";
    }
    print "]\n";
}

# Main

open(FIN,$ARGV[0])
  or
      die ("error opening input file because: $!");
@inner = <FIN>;
close(FIN);

open(FOUT, "+>serial_old.log");
open(PORTA, "+</dev/ttyS0");

foreach $riga (@inner)
{
   chomp($riga);
   comunicate($riga);
}

close(PORTA);
close(FOUT);
============

serconf.pl - The script that sets the port parameters and writes them to a config file
======================================================================================

#!/usr/bin/perl -w

use Device::SerialPort;

# Initialisation

$PortName="/dev/ttyS0";
$ConfigurationFileName="./ttyS0.conf";
$quiet=1;
$lockfile="./lock";
$PortObj = new Device::SerialPort ($PortName, $quiet, $lockfile)
              || die "Can't open $PortName: $!\n";

$PortObj->user_msg(ON);
$PortObj->databits(8);
$PortObj->baudrate(9600);
$PortObj->parity("none");
$PortObj->stopbits(1);
$PortObj->handshake("rts");

print "Given configuration\n\n";
print "Port Name: $PortName\n";
$baud = $PortObj->baudrate;
$parity = $PortObj->parity;
$data = $PortObj->databits;
$stop = $PortObj->stopbits;
$hshake = $PortObj->handshake;

print "B = $baud, D = $data, S = $stop, P = $parity, H = $hshake\n";


$PortObj->write_settings;
$PortObj->save($ConfigurationFileName) || warn "Can't save $ConfigurationFileName: $!\n";
=========================================================================================

serial.pl - The Device::SerialPort version
==========================================

#!/usr/bin/perl -w

use Device::SerialPort;

# Routines

# comunicate: adds a customary terminator to the string, which is then sent to
# the serial port, the standard output and the logfile; finally it reads the 
# reply coming from the serial port and prints it on the standard output and
# the logfile

sub comunicate{
    $terminator = "\n";
    $stringout = $_[0].$terminator;
    print PORTA $stringout;
    print "Sent: $stringout\n";
    print FOUT "Sent: $stringout\n";
    ascspell($stringout);
    $answer = <PORTA>;
    print "Received: $answer\n";
    print FOUT "Received: $answer\n";
    ascspell($answer);
}

# ascspell: displays the ASCII codes for each character in a given string

sub ascspell{
    @array = unpack("C*", $_[0]);
    print "[";
    foreach $ch (@array) {
            print "$ch ";
            print FOUT "$ch ";
    }
    print "]\n";
}

# Initialisation

$cfgfile="./ttyS0.conf";                            # created by serconf.pl
$PortObj= tie(*PORTA,'Device::SerialPort', $cfgfile)
          || die "Can't start $cfgfile\n";

my $name= $PortObj->alias;
my $baud = $PortObj->baudrate;
my $parity = $PortObj->parity;
my $data = $PortObj->databits;
my $stop = $PortObj->stopbits;
my $hshake = $PortObj->handshake;

print "Port: $name\nB = $baud, D = $data, S = $stop, P = $parity, H = $hshake\n";

# Main

open(FIN,$ARGV[0])
  or
      die ("error opening input file because: $!");
@inner = <FIN>;
close FIN;

open(FOUT, "+>serial.log");

foreach $riga (@inner)
{
   chomp($riga);
   comunicate($riga);
}

close PORTA || print "port close failed\n"; 
undef $PortObj;
untie *PORTA;

close FOUT;