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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2015-2023 -- leonerd@leonerd.org.uk |
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use v5.26; |
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use warnings; |
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use Object::Pad 0.800; |
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package Device::Chip::MCP23x17::Adapter 0.07; |
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class Device::Chip::MCP23x17::Adapter; |
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# can't 'extends Device::Chip::Adapter' because that doesn't provide a SUPER::new |
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use base qw( Device::Chip::Adapter ); |
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use Carp; |
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use Future::AsyncAwait; |
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=head1 NAME |
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C - C over F chip |
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=head1 SYNOPSIS |
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use Device::Chip::MCP23S17; |
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use Future::AsyncAwait; |
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my $chip = Device::Chip::MCP23S17->new; |
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await $chip->mount( Device::Chip::Adapter::...->new ); |
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my $adapter = $chip->as_adapter; |
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my $second_chip = Device::Chip::...->new; |
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await $second_chip->mount( $adapter ); |
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=head1 DESCRIPTION |
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This implementation of the L API provides the C |
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protocol, by exposing the 16bit GPIO registers of a F chip as 16 |
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named GPIO pins. It allows, for example, a second instance of some |
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L implementation that uses the GPIO protocol, to be attached via |
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the F chip. |
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Instances of this class are not created directly; they are returned by |
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L. |
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=cut |
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field $_chip :param; |
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# Only supports GPIO |
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method make_protocol_GPIO () { $self } |
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my %GPIOs = ( |
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( map { +"A$_", ( 1 << $_ ) } 0 .. 7 ), |
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( map { +"B$_", ( 1 << $_ ) << 8 } 0 .. 7 ), |
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); |
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method list_gpios () |
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{ |
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return sort keys %GPIOs; |
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} |
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async method write_gpios ( $gpios ) |
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{ |
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my $val = 0; |
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my $mask = 0; |
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foreach ( keys %$gpios ) { |
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my $bitmask = $GPIOs{$_} or croak "Unrecognised GPIO name $_"; |
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$val |= $bitmask if $gpios->{$_}; |
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$mask |= $bitmask; |
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} |
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$mask or return; |
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await $_chip->write_gpio( $val, $mask ); |
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} |
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async method read_gpios ( $gpios ) |
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{ |
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my $mask = 0; |
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foreach ( @$gpios ) { |
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my $bitmask = $GPIOs{$_} or croak "Unrecognised GPIO name $_"; |
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$mask |= $bitmask; |
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} |
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$mask or return {}; |
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my $bits = await $_chip->read_gpio( $mask ); |
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my %ret; |
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$ret{$_} = $bits & $GPIOs{$_} ? 1 : 0 for @$gpios; |
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return \%ret; |
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} |
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102
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=head1 AUTHOR |
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Paul Evans |
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=cut |
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0x55AA; |