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86 lines
1.7 KiB
Perl
86 lines
1.7 KiB
Perl
package Device::Firmata::IO;
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=head1 NAME
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Device::Firmata::IO - implement the low level serial IO
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=cut
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use strict;
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use warnings;
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use vars qw/ $SERIAL_CLASS /;
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use Device::Firmata::Base
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ISA => 'Device::Firmata::Base',
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FIRMATA_ATTRIBS => {
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handle => undef,
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baudrate => 57600,
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};
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$SERIAL_CLASS = $^O eq 'MSWin32' ? 'Win32::Serialport'
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: 'Device::SerialPort';
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eval "require $SERIAL_CLASS";
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=head2 open
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=cut
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sub open {
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# --------------------------------------------------
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my ( $pkg, $serial_port, $opts ) = @_;
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my $self = ref $pkg ? $pkg : $pkg->new($opts);
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my $serial_obj = $SERIAL_CLASS->new( $serial_port, 1, 0 ) or return;
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$self->attach($serial_obj,$opts);
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$self->{handle}->baudrate($self->{baudrate});
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$self->{handle}->databits(8);
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$self->{handle}->stopbits(1);
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return $self;
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}
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sub attach {
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my ( $pkg, $serial_obj, $opts ) = @_;
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my $self = ref $pkg ? $pkg : $pkg->new($opts);
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$self->{handle} = $serial_obj;
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return $self;
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}
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=head2 data_write
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Dump a bunch of data into the comm port
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=cut
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sub data_write {
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# --------------------------------------------------
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my ( $self, $buf ) = @_;
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$Device::Firmata::DEBUG and print ">".join(",",map{sprintf"%02x",ord$_}split//,$buf)."\n";
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return $self->{handle}->write( $buf );
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}
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=head2 data_read
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We fetch up to $bytes from the comm port
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This function is non-blocking
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=cut
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sub data_read {
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# --------------------------------------------------
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my ( $self, $bytes ) = @_;
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my ( $count, $string ) = $self->{handle}->read($bytes);
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if ( $Device::Firmata::DEBUG and $string ) {
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print "<".join(",",map{sprintf"%02x",ord$_}split//,$string)."\n";
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}
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return $string;
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}
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1;
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