#!/opt/perl/bin/perl -w

# cross-platform example1

use strict;
use vars qw( $OS_win $ob $port );

BEGIN {
        $OS_win = ($^O eq "MSWin32") ? 1 : 0;
        eval "use Device::SerialPort";
        die "$@\n" if ($@);
} # End BEGIN

$port = '/dev/ttyUSB0';
$ob = Device::SerialPort->new ($port);
die "Can't open serial port $port: $^E\n" unless ($ob);

$ob->user_msg(1);	# misc. warnings
$ob->error_msg(1);	# hardware and data errors

$ob->baudrate(4800);
$ob->parity("none");
## $ob->parity_enable(1);   # for any parity except "none"
$ob->databits(8);
$ob->stopbits(1);
$ob->handshake('none');

my $baud = $ob->baudrate;
my $parity = $ob->parity;
my $data = $ob->databits;
my $stop = $ob->stopbits;
my $hshake = $ob->handshake;

my @baud_opt = $ob->baudrate;
my @parity_opt = $ob->parity;
my @data_opt = $ob->databits;
my @stop_opt = $ob->stopbits;
my @hshake_opt = $ob->handshake;

my $c = 8;

print "\nData Bit Options:   ";
foreach $a (@data_opt) { print "  $a"; }

print "\n\nStop Bit Options:   ";
foreach $a (@stop_opt) { print "  $a"; }

print "\n\nHandshake Options:  ";
foreach $a (@hshake_opt) { print "  $a"; }

print "\n\nParity Options:     ";
foreach $a (@parity_opt) { print "  $a"; }

print "\n\nBaudrate Options:   ";
foreach $a (@baud_opt) {
    print "  $a";
    unless (--$c > 0) {
        $c = 8;
        print "\n                    ";
    }
}
print "\n\nCurrent Settings:     ";
print "B = $baud, D = $data, P = $parity, S = $stop,  H = $hshake\n";

$ob->read_interval(0) if ($OS_win);
$ob->read_const_time(10000);

sleep 1;
my $result = $ob->input;
print "result = $result\n";

print "Starting 500 character background read\n";
my $in;
$in = $ob->read_bg(500) if ($OS_win);
my $done = 0;
my $blk;
my $err;
my $out;
for (;;) {
    ($blk, $in, $out, $err)=$ob->status;
    print "got $in characters so far..\n";
    sleep 1;
    ($done, $in, $result) = $ob->read_done(0) if ($OS_win);
    last if $done;
    last if ($in >= 500);
}


my $active = $ob->input;
print "result = $active\n";
sleep 1;
$active = $ob->input;
$result = "";

while ($active) {
   sleep 1;
   $active = $ob->input;
   print "result = $active\n";
}

print "\n\n....And now the rest = \n$result\n";

undef $ob;

print "Hello World\n";

<STDIN>;