File Coverage

blib/lib/RPi/SPI.pm

Criterion	Covered	Total	%
statement	7	9	77.7
branch			n/a
condition			n/a
subroutine	3	3	100.0
pod			n/a
total	10	12	83.3

package RPi::SPI;

use strict;
use warnings;

use WiringPi::API qw(:wiringPi);

our $VERSION = '2.3607';

sub new {
    my ($class, $channel, $speed) = @_;

    my $self = bless {}, $class;

    $self->_channel($channel);
    $self->_channel($speed);

    # check if we're in bit-banging mode

    if ($self->_cs){
        pin_mode($self->_cs, 1);
        write_pin($self->_cs, 1);
    }

    if (wiringPiSPISetup($self->_channel, $self->_speed) < 0){
        die "couldn't establish communication on the SPI bus\n";
    }

    return $self;
}
sub rw {
    my ($self, $buf, $len) = @_;

    if ($self->_cs){
        pin_mode($self->_cs, 0);
        @$buf = spiDataRW($self->_channel, $buf, $len);
        pin_mode($self->_cs, 1);
    }
    else {
        @$buf = spiDataRW($self->_channel, $buf, $len);
    }

    return @$buf;
}
sub _channel {
    my ($self, $chan) = @_;

    if (defined $chan){
        if ($chan > 1){
            $self->_cs($chan);
            $self->{channel} = 0;
        }
        else {
            $self->{channel} = $chan;
        }
    }

    return $self->{channel};
}
sub _cs {
    my ($self, $cs) = @_;

    $self->{cs} = $cs if defined $cs;
    return $self->{cs};
}
sub _speed {
    my ($self, $speed) = @_;
    $self->{speed} = $speed if defined $speed;
    return $self->{speed} || 1000000;
}
sub _vim{};

1;
__END__