NAME

RPi::WiringPi::Interrupt - Raspberry Pi GPIO pin interrupts

SYNOPSIS

use RPi::WiringPi::Interrupt;
use RPi::WiringPi::Constant qw(:all);

my $int = RPi::WiringPi::Interrupt->new;

my $pin = 6;

$int->set($pin, EDGE_HIGH, 'interrupt_handler');

sub interrupt_handler {
    print "in handler";
    # turn a pin on, or do other things
}

$int->unset($pin);

DESCRIPTION

This module allows you to set up, and un-set GPIO pin edge detection interrupts where you can supply the name of a Perl subroutine that you write that will act as the interrupt handler.

The backend is written in C and is threaded, so it doesn't block the main program thread from running while waiting for the interrupt to occur.

METHODS

new()

Returns a new RPi::WiringPi::Interrupt object.

set($pin, $edge, $callback)

Starts a new thread that waits for an interrupt on the specified pin, when the selected edge is triggered. The name of the Perl subroutine in $callback will be the code executed as the interrupt handler.

Parameters:

$pin

Mandatory: The pin number to set the interrupt on. We'll convert the pin number appropriately regardless of which pin mapping you're currently using.

$edge

Mandatory: One of 1 (LOW), 2 (HIGH) or 3 for both HIGH and LOW.

$callback

Mandatory: This is the name of a user-written Perl subroutine that contains the code you want to execute when the edge change is detected on the pin. (ie. the Interrupt Handler).

unset($pin)

Terminates an interrupt thread, and stops monitoring for more.

Parameters:

$pin

Mandatory: The pin number. You can also send in 'all', which will disable all currently implemented interrupts.

$edge

Mandatory: see set() for details.

SEE ALSO

AUTHOR

Steve Bertrand, <steveb@cpan.org>

COPYRIGHT AND LICENSE

Copyright (C) 2016 by Steve Bertrand

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.18.2 or, at your option, any later version of Perl 5 you may have available.

cpanm RPi::WiringPi

perl -MCPAN -e shell
install RPi::WiringPi