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package USB::HID::Report::Field; |
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use strict; |
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use warnings; |
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use feature 'switch'; |
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our $VERSION = '1'; |
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=head1 NAME |
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USB::HID::Report::Field - USB HID Report Field |
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=head1 SYNOPSIS |
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An object representation of a USB HID Report Field. L |
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doesn't directly correspond to any particular part of a HID report desriptor. It |
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provides a convenience interface for specifying the properties of a report |
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field that can be translated into the appropriate descriptor items. |
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use USB::HID::Report::Field; |
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my $field = USB::HID::Report::Field->new( 'usage' => 1, ... ); |
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$field->set_attribute('variable'); |
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... |
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=head1 DESCRIPTION |
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L is an abstract representation of a field in a USB HID |
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Report. When added to an instance of L it can be used to |
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generate the items in HID Report Descriptor. |
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Several convenience constructors are provided for creating commonly used field |
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types. |
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use USB::HID::Report::Field; |
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# Button 1 |
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my $button = USB::HID::Report::Field->button( 'usage' => 1 ); |
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# 7 bits of padding |
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my $constant = USB::HID::Report::Field->constant(7); |
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=head1 CONSTRUCTORS |
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Several convenience constructors are provided for creating commonly used field |
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types. Each constructor accepts the same arguments as the default constructor |
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(C). Some constructors also accept a simplified argument set. |
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=over |
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=item $field = USB::HID::Report::Field->new('usage'=>$usage, ...); |
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Constructs and returns a new L object using the passed |
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options. Each option key is the name of an accessor method. |
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56
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=item $button = USB::HID::Report::Field->button(); |
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Constructs and returns a L configured as a button. |
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B and B are automatically set and override any |
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corresponding arguments. Specify a B to set the button number. |
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Alternatively, a single scalar can be passed to set the button number: |
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64
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$button = USB::HID::Report::Field->button(3); # Button 3 |
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66
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=item $padding = USB::HID::Report::Field->constant($num_bits); |
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Constructs and returns a L configured to be used as |
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constant padding bits in a report. Pass a single integer to set the number of |
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bits. Alternatively, a hash containing a 'bits' key can be used to set the |
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number of bits. |
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=back |
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=cut |
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sub new |
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{ |
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my ($this, %options) = @_; |
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my $class = ref($this) || $this; |
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# Set defaults |
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my $self = |
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{ |
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'usage' => 0, # Undefined |
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}; |
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bless $self, $class; |
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while( my ($key, $value) = each %options ) |
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{ |
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$self->$key($value); |
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} |
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return $self; |
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} |
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sub button |
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{ |
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# If a single scalar was passed, assume it's a button number and pass it |
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# as the field's Usage |
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0
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push @_, 'usage' => pop(@_) if( 2 == @_ ); |
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my $s = new(@_); |
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$s->logical_range(0,1); # Binary |
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$s->page(9); # Buttons |
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$s->count(1); # Each button is a single bit |
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$s->size(1); # Each button is a single bit |
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$s->set_attribute('variable'); |
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return $s; |
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} |
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# Accepts a single integer that behaves like 'bits' |
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sub constant |
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{ |
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if( 2 == @_ ) |
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{ |
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new($_[0], 'bits' => $_[1], 'attributes' => ['constant']); |
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} |
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else |
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{ |
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new(@_, 'attributes' => ['constant']); |
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} |
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} |
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128
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=head1 ARRAYIFICATION |
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130
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=over |
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132
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=item $field->bytes(\%state) |
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Returns an array of bytes containing all of the items for the field. Uses %state |
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to avoid repeating items that have been emitted by previous fields. |
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=back |
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139
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=cut |
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141
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sub _should_emit |
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{ |
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my ($state, $tag, $value) = @_; |
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if( defined($value) ) |
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{ |
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if( exists $state->{$tag} ) { $value != $state->{$tag} } |
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0
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else { 1 } |
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} |
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0
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else { 0 } |
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} |
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152
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sub _emit_item |
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{ |
154
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0
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my ($state, $tag, $value) = @_; |
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my $type = USB::HID::Descriptor::Report::item_type($tag); |
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if( _should_emit($state->{$type}, $tag, $value) ) |
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{ |
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0
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$state->{$type}{$tag} = $value; |
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USB::HID::Descriptor::Report::item($tag, $value); |
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} |
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0
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else { () } |
162
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} |
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164
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sub bytes |
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{ |
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my ($s, $state) = @_; |
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168
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( |
169
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0
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_emit_item($state, 'logical_minimum', $s->logical_min), |
170
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_emit_item($state, 'logical_maximum', $s->logical_max), |
171
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_emit_item($state, 'report_count', $s->count), |
172
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_emit_item($state, 'report_size', $s->size), |
173
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_emit_item($state, 'usage', $s->usage), |
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USB::HID::Descriptor::Report::item($state->{'main'}, $s->attributes), |
175
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) |
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} |
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178
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=head1 MAIN ITEM ATTRIBUTES |
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180
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HID report Bs have a number of attributes that can be set. Anything |
181
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that isn't explicitly set defaults to 0. These attributes correspond to the |
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names of the bits of the "Main Items" specified on page 28 of the |
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L. |
184
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185
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The attribute names accepted by C are: |
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187
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constant variable relative wrap nonlinear noprefered null volatile buffered |
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data array absolute nowrap linear preferred nonull nonvolatile bitfield |
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190
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=over |
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192
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=item $field->attributes(...) |
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194
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Set the list of attributes for the field object and replace any existing list. |
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Returns all currently set attributes. |
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197
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=item $field->set_attribute(...) |
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199
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Add the passed attributes to the current list of attributes. Returns all |
200
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currently set attributes, including the passed arguments. |
201
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202
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=back |
203
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204
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=cut |
205
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206
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# Replace the existing set of attributes with the given list |
207
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sub attributes |
208
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{ |
209
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0
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0
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1
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my $s = shift; |
210
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0
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0
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if( @_ ) |
211
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{ |
212
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0
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$s->{'attributes'} = {}; |
213
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0
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$s->set_attribute(@_); |
214
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} |
215
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0
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keys %{$s->{'attributes'}}; |
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216
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} |
217
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218
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# Set the given list of attributes. Doesn't clear existing attributes. |
219
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sub set_attribute |
220
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{ |
221
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0
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0
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1
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my $s = shift; |
222
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0
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for(@_) |
223
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{ |
224
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when([qw(constant variable relative wrap nonlinear noprefered null volatile buffered)]) |
225
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0
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{ |
226
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0
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$s->{'attributes'}{$_} = 1; |
227
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} |
228
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when([qw(data array absolute nowrap linear preferred nonull nonvolatile bitfield)]) |
229
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0
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{ |
230
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0
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delete $s->{'attributes'}{$_}; |
231
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} |
232
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} |
233
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0
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keys %{$s->{'attributes'}}; |
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234
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} |
235
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236
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=head1 ATTRIBUTES |
237
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238
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=over |
239
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240
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=item $field->bits($num_bits) |
241
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242
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Sets C to 1 and C to C<$num_bits>. Returns C, |
243
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244
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=item $field->count() |
245
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246
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Get/Set the field's B property. |
247
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248
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=item $field->logical_max() |
249
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250
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Get/Set the field's maximum logical value. |
251
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252
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=item $field->logical_min() |
253
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254
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Get/Set the field's minimum logical value. |
255
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256
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=item $field->logical_range($min, $max) |
257
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258
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Get/Set both C and C. |
259
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260
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=item $field->page($page_number) |
261
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262
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Get/Set the field's B. |
263
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264
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=item $field->size() |
265
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266
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Get/Set the field's B property. |
267
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268
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=item $field->usage($usage_number) |
269
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270
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Get/Set the field's B. |
271
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272
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=item $field->usage_max() |
273
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274
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Get/Set the upper end of the usage range for field objects that correspond to |
275
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multiple Bs. |
276
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277
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=item $field->usage_min() |
278
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279
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Get/Set the lower end of the usage range for field objects that correspond to |
280
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mutiple Bs. |
281
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282
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=item $field->usage_range($min, $max) |
283
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284
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Get/Set both C and C. |
285
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286
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=back |
287
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288
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=cut |
289
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290
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sub page |
291
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{ |
292
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0
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0
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1
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my $s = shift; |
293
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0
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0
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$s->{'page'} = shift if scalar @_; |
294
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0
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|
$s->{'page'}; |
295
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} |
296
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297
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sub usage |
298
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{ |
299
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0
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0
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1
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my $s = shift; |
300
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0
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0
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$s->{'usage'} = int(shift) & 0xFF if scalar @_; |
301
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0
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$s->{'usage'}; |
302
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} |
303
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304
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sub usage_max |
305
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{ |
306
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0
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0
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1
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|
my $s = shift; |
307
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0
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0
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|
$s->{'usage_max'} = shift if scalar @_; |
308
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0
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|
$s->{'usage_max'}; |
309
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} |
310
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311
|
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sub usage_min |
312
|
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{ |
313
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0
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0
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1
|
|
my $s = shift; |
314
|
0
|
0
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|
|
$s->{'usage_min'} = shift if scalar @_; |
315
|
0
|
|
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|
$s->{'usage_min'}; |
316
|
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|
} |
317
|
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318
|
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|
# Pass (min,max) |
319
|
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|
sub usage_range |
320
|
|
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|
{ |
321
|
0
|
|
|
0
|
1
|
|
my $s = shift; |
322
|
0
|
0
|
|
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|
|
if( 2 == @_ ) |
323
|
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|
{ |
324
|
0
|
0
|
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|
|
@_[0..1] = @_[1..0] if( $_[1] < $_[0] ); # swap? |
325
|
0
|
|
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|
|
$s->usage_min($_[0]); |
326
|
0
|
|
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|
|
$s->usage_max($_[1]); |
327
|
|
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|
|
|
} |
328
|
0
|
|
|
|
|
|
grep { defined $_; } ($s->usage_min, $s->usage_max);# elide undefs |
|
0
|
|
|
|
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|
|
329
|
|
|
|
|
|
|
} |
330
|
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|
331
|
|
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|
|
|
|
sub logical_max |
332
|
|
|
|
|
|
|
{ |
333
|
0
|
|
|
0
|
1
|
|
my $s = shift; |
334
|
0
|
0
|
|
|
|
|
$s->{'logical_max'} = shift if scalar @_; |
335
|
0
|
|
|
|
|
|
$s->{'logical_max'}; |
336
|
|
|
|
|
|
|
} |
337
|
|
|
|
|
|
|
|
338
|
|
|
|
|
|
|
sub logical_min |
339
|
|
|
|
|
|
|
{ |
340
|
0
|
|
|
0
|
1
|
|
my $s = shift; |
341
|
0
|
0
|
|
|
|
|
$s->{'logical_min'} = shift if scalar @_; |
342
|
0
|
|
|
|
|
|
$s->{'logical_min'}; |
343
|
|
|
|
|
|
|
} |
344
|
|
|
|
|
|
|
|
345
|
|
|
|
|
|
|
sub logical_range |
346
|
|
|
|
|
|
|
{ |
347
|
0
|
|
|
0
|
1
|
|
my $s = shift; |
348
|
0
|
0
|
|
|
|
|
if( 2 == @_ ) |
349
|
|
|
|
|
|
|
{ |
350
|
0
|
0
|
|
|
|
|
@_[0..1] = @_[1..0] if( $_[1] < $_[0] ); # swap? |
351
|
0
|
|
|
|
|
|
$s->logical_min($_[0]); |
352
|
0
|
|
|
|
|
|
$s->logical_max($_[1]); |
353
|
|
|
|
|
|
|
} |
354
|
0
|
|
|
|
|
|
grep { defined $_; } ($s->logical_min, $s->logical_max); # elide undefs |
|
0
|
|
|
|
|
|
|
355
|
|
|
|
|
|
|
} |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
sub count |
358
|
|
|
|
|
|
|
{ |
359
|
0
|
|
|
0
|
1
|
|
my $s = shift; |
360
|
0
|
0
|
|
|
|
|
$s->{'count'} = shift if scalar @_; |
361
|
0
|
|
|
|
|
|
$s->{'count'}; |
362
|
|
|
|
|
|
|
} |
363
|
|
|
|
|
|
|
|
364
|
|
|
|
|
|
|
sub size |
365
|
|
|
|
|
|
|
{ |
366
|
0
|
|
|
0
|
1
|
|
my $s = shift; |
367
|
0
|
0
|
|
|
|
|
$s->{'size'} = shift if scalar @_; |
368
|
0
|
|
|
|
|
|
$s->{'size'}; |
369
|
|
|
|
|
|
|
} |
370
|
|
|
|
|
|
|
|
371
|
|
|
|
|
|
|
sub bits |
372
|
|
|
|
|
|
|
{ |
373
|
0
|
|
|
0
|
1
|
|
my $s = shift; |
374
|
0
|
0
|
|
|
|
|
if( @_ ) |
375
|
|
|
|
|
|
|
{ |
376
|
0
|
|
|
|
|
|
$s->size(1); |
377
|
0
|
|
|
|
|
|
$s->count(shift); |
378
|
|
|
|
|
|
|
} |
379
|
0
|
|
|
|
|
|
$s->count; |
380
|
|
|
|
|
|
|
} |
381
|
|
|
|
|
|
|
|
382
|
|
|
|
|
|
|
1; |
383
|
|
|
|
|
|
|
|
384
|
|
|
|
|
|
|
=head1 AUTHOR |
385
|
|
|
|
|
|
|
|
386
|
|
|
|
|
|
|
Brandon Fosdick, C<< >> |
387
|
|
|
|
|
|
|
|
388
|
|
|
|
|
|
|
=head1 BUGS |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
|
|
|
Please report any bugs or feature requests to C, or through |
391
|
|
|
|
|
|
|
the web interface at L. I will be notified, and then you'll |
392
|
|
|
|
|
|
|
automatically be notified of progress on your bug as I make changes. |
393
|
|
|
|
|
|
|
|
394
|
|
|
|
|
|
|
=head1 SUPPORT |
395
|
|
|
|
|
|
|
|
396
|
|
|
|
|
|
|
You can find documentation for this module with the perldoc command. |
397
|
|
|
|
|
|
|
|
398
|
|
|
|
|
|
|
perldoc USB::HID::Report::Field |
399
|
|
|
|
|
|
|
|
400
|
|
|
|
|
|
|
|
401
|
|
|
|
|
|
|
You can also look for information at: |
402
|
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
=over 4 |
404
|
|
|
|
|
|
|
|
405
|
|
|
|
|
|
|
=item * RT: CPAN's request tracker (report bugs here) |
406
|
|
|
|
|
|
|
|
407
|
|
|
|
|
|
|
L |
408
|
|
|
|
|
|
|
|
409
|
|
|
|
|
|
|
=item * AnnoCPAN: Annotated CPAN documentation |
410
|
|
|
|
|
|
|
|
411
|
|
|
|
|
|
|
L |
412
|
|
|
|
|
|
|
|
413
|
|
|
|
|
|
|
=item * CPAN Ratings |
414
|
|
|
|
|
|
|
|
415
|
|
|
|
|
|
|
L |
416
|
|
|
|
|
|
|
|
417
|
|
|
|
|
|
|
=item * Search CPAN |
418
|
|
|
|
|
|
|
|
419
|
|
|
|
|
|
|
L |
420
|
|
|
|
|
|
|
|
421
|
|
|
|
|
|
|
=back |
422
|
|
|
|
|
|
|
|
423
|
|
|
|
|
|
|
|
424
|
|
|
|
|
|
|
=head1 ACKNOWLEDGEMENTS |
425
|
|
|
|
|
|
|
|
426
|
|
|
|
|
|
|
|
427
|
|
|
|
|
|
|
=head1 LICENSE AND COPYRIGHT |
428
|
|
|
|
|
|
|
|
429
|
|
|
|
|
|
|
Copyright 2011 Brandon Fosdick. |
430
|
|
|
|
|
|
|
|
431
|
|
|
|
|
|
|
This program is released under the terms of the BSD License. |
432
|
|
|
|
|
|
|
|
433
|
|
|
|
|
|
|
=cut |