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fail-ttl-counter.pl
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fail-ttl-counter.pl
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#!/usr/bin/env perl
use warnings;
use strict;
use lib qw(lib);
{
package Counter;
use Moose;
extends 'Reflex::Base';
use Reflex::Trait::EmitsOnChange;
use Reflex::Trait::Watched;
use Ttl::FlipFlop::T;
use Ttl::HexDecoder;
# Create a four-bit counter using T flip-flops.
# The counter schematic comes from Don Lancaster's _TTL Cookbook_.
# Other sources (like www.play-hookey.com) seem to be flaky.
watches t1 => ( isa => 'Ttl::FlipFlop::T', handles => ['clock'] );
watches t2 => ( isa => 'Ttl::FlipFlop::T' );
watches t4 => ( isa => 'Ttl::FlipFlop::T' );
watches t8 => ( isa => 'Ttl::FlipFlop::T' );
watches decoder => ( isa => 'Ttl::HexDecoder' );
emits out => ( isa => 'Str' );
sub on_t1_q {
my ($self, $args) = @_;
$self->decoder->ones($args->{value});
}
sub on_t2_q {
my ($self, $args) = @_;
$self->decoder->twos($args->{value});
}
sub on_t4_q {
my ($self, $args) = @_;
$self->decoder->fours($args->{value});
}
sub on_t8_q {
my ($self, $args) = @_;
$self->decoder->eights($args->{value});
}
sub on_decoder_out {
my ($self, $args) = @_;
$self->out($args->{value});
}
sub on_t1_not_q {
my ($self, $args) = @_;
$self->t2->clock($args->{value});
}
sub on_t2_not_q {
my ($self, $args) = @_;
$self->t4->clock($args->{value});
}
sub on_t4_not_q {
my ($self, $args) = @_;
$self->t8->clock($args->{value});
}
sub BUILD {
my $self = shift;
$self->t1( Ttl::FlipFlop::T->new() );
$self->t2( Ttl::FlipFlop::T->new() );
$self->t4( Ttl::FlipFlop::T->new() );
$self->t8( Ttl::FlipFlop::T->new() );
$self->decoder( Ttl::HexDecoder->new() );
}
}
### An object to drive the clock and display its output.
{
package Driver;
use Moose;
extends 'Reflex::Base';
use Reflex::Interval;
use Reflex::Trait::Watched;
watches counter => ( isa => 'Counter' );
watches clock => ( isa => 'Reflex::Interval' );
sub BUILD {
my $self = shift;
$self->counter( Counter->new() );
$self->clock( Reflex::Interval->new( interval => 1, auto_repeat => 1 ) );
}
sub on_clock_tick {
my $self = shift;
$self->counter->clock(1);
$self->counter->clock(0);
}
sub on_counter_out {
my ($self, $args) = @_;
print "Counter: $args->{value}\n";
}
}
### Main.
exit Driver->new()->run_all();