<HTML>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Mixed Handlers Example</title></head>
<BODY TOPMARGIN=4 BGCOLOR=#FFFFFF TEXT=#000000 VLINK=#0000CC LINK=#0000CC ALINK=#0000CC>
<FONT FACE="Arial, Lucida, Helvetica" >
<TABLE WIDTH="100%" ALIGN=CENTER CELLPADDING=1 CELLSPACING=0>
<TR>
<TD WIDTH="100%" ALIGN=CENTER>
<A HREF="contents.htm"><img align=center src="home.png" BORDER=0 ALT="Contents"></A>
<A HREF="interrupt.htm"><img align=center src="up.png" BORDER=0 ALT="Up"></A>
<A HREF="interrupt_example_callback.htm"><img align=center src="back.png" BORDER=0 ALT="Previous"></A>
<A HREF="mod_device.htm"><img align=center src="forward.png" BORDER=0 ALT="Next"></A>
</TD>
</TR>
<TR>
<TD COLSPAN=2 HEIGHT=2 BGCOLOR="#C0C0C0">
</TD>
</TR>
</TABLE>
<H2>Mixed Handlers Example</H2>
<pre><font color="#404040"><i>#!/usr/bin/perl</i></font>
<font color="#009A00"><i># If using interupts the HiPi::Interrupt module should be used
# before anything else in your script. This is because the
# module loads threads to handle interrupts for pins managed
# by HiPi::Device::GPIO, HiPi::BCM2835 and HiPi::Wiring.
# Loading first reduces your memory footprint and avoids issues
# with modules you may use that are not thread safe.</i></font>
use HiPi::Interrupt;
<font color="#009A00"><i># To demonstrate use with HiPi::BCM2835 access
# to pins we must run the script using 'sudo'.
# If we only used HiPi::Device::GPIO pins then
# sudo usage is not necessary provided the user
# running the process is a member of the gpio
# group.</i></font>
use HiPi::BCM2835;
<font color="#009A00"><i># Some basic modules loaded</i></font>
use 5.14.0;
use strict;
use warnings;
use HiPi::Device::GPIO;
use HiPi::Constant qw( :raspberry );
<font color="#009A00"><i># instead of deriving a class we use HiPi::Interrupt::Handler
# directly and register callbacks for one or more of:
#
# start, add, remove, interrupt,
# error, continue, stop</i></font>
use HiPi::Interrupt::Handler;
my $handler = HiPi::Interrupt::Handler->new;
<font color="#009A00"><i># register a callback for interrupts</i></font>
$handler->register_callback('interrupt', sub {
my ($self, $msg ) = @_;
say'--------------------------------';
my $output = ( $msg->error ) ? 'ERROR MESSAGE' : uc($msg->action) . ' HANDLED';
say $output;
say qq( action : ) . $msg->action;
say qq( pinid : ) . $msg->pinid;
say qq( error : ) . $msg->error;
say qq( value : ) . $msg->value;
say qq( timestamp : ) . $msg->timestamp;
say qq( msgtext : ) . $msg->msgtext;
say qq( pinclass : ) . $msg->pinclass;
say'--------------------------------';
});
<font color="#009A00"><i># register a callback for start</i></font>
$handler->register_callback('start', sub {
my ($self) = @_;
say 'INTERRUPT HANDLING STARTED';
});
<font color="#009A00"><i># register a callback for stop</i></font>
$handler->register_callback('stop', sub {
my ($self) = @_;
say 'INTERRUPT HANDLING STOPPED';
});
<font color="#009A00"><i># Create the pin monitoring</i></font>
{
<font color="#009A00"><i># setup a pin as input with a pull up
# resistor and falling edge interrupt
# using HiPi::Device::GPIO</i></font>
my $dev = HiPi::Device::GPIO->new;
my $pin1 = $dev->export_pin( RPI_PAD1_PIN_13 );
$pin1->mode(RPI_PINMODE_INPT);
$pin1->set_pud(RPI_PUD_OFF);
$pin1->set_pud(RPI_PUD_UP);
$pin1->interrupt( RPI_INT_FALL );
<font color="#009A00"><i># setup a pin as input with a pull down
# resistor and rising edge interrupt
# using HiPi::BCM2835 ( requires running
# using sudo for /dev/mem access so
# by default this example uses gpio
# device driver)</font>
my $bcm = HiPi::BCM2835->new;
my $pin2 = $bcm->get_pin( RPI_PAD1_PIN_11 );
$pin2->mode(RPI_PINMODE_INPT);
$pin2->set_pud(RPI_PUD_OFF);
$pin2->set_pud(RPI_PUD_DOWN);
$pin2->interrupt( RPI_INT_RISE );
<font color="#009A00"><i># add pins demonstrating using the alternate
# method specifying a pin number and class</i></font>
$handler->add_pin( RPI_PAD1_PIN_13, 'gpio' );
$handler->add_pin( RPI_PAD1_PIN_11, 'bcmd' );
}
<font color="#009A00"><i># run the application loop</i></font>
$handler->poll();
1;
</pre></FONT>
<br>
<p>
<br>
<hr>
<br>
<center>
<A HREF="contents.htm"><img align=center src="home.png" BORDER=0 ALT="Contents"></A>
<A HREF="interrupt.htm"><img align=center src="up.png" BORDER=0 ALT="Up"></A>
<A HREF="interrupt_example_callback.htm"><img align=center src="back.png" BORDER=0 ALT="Previous"></A>
<A HREF="mod_device.htm"><img align=center src="forward.png" BORDER=0 ALT="Next"></A>
</center>
<HR>
<br>
<center><FONT FACE="Arial, Lucida, Helvetica" size="2" color="#000080">HiPi Modules Copyright © 2013 Mark Dootson</font></center>
</BODY></HTML>