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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, 2017-2023 -- leonerd@leonerd.org.uk |
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312512
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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::LTC2400 0.15; |
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class Device::Chip::LTC2400 |
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:isa(Device::Chip); |
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use Future::AsyncAwait; |
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use constant PROTOCOL => "SPI"; |
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1288
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=head1 NAME |
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C - chip driver for F |
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=head1 DESCRIPTION |
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This L subclass provides specific communications to a |
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F F chip attached to a computer via an SPI |
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adapter. |
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The reader is presumed to be familiar with the general operation of this chip; |
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the documentation here will not attempt to explain or define chip-specific |
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concepts or features, only the use of this module to access them. |
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=cut |
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sub SPI_options |
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{ |
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return ( |
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mode => 0, |
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max_bitrate => 2E6, |
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); |
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} |
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=head1 METHODS |
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The following methods documented in an C expression return L |
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instances. |
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=cut |
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=head2 read_adc |
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$reading = await $chip->read_adc; |
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Returns a C reference containing the fields obtained after a successful |
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conversion. |
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The following values will be stored in the hash: |
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EOC => 0 | 1 |
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EXR => 0 | 1 |
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SIG => 0 | 1 |
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VALUE => (a 24bit integer) |
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If the C value is false, then a conversion is still in progress and no |
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other fields will be provided. |
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=cut |
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1
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3
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async method read_adc () |
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{ |
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my $bytes = await $self->protocol->readwrite( "\x00" x 4 ); |
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1
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9283
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my $value = unpack "L>", $bytes; |
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1
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if( $value & 1<<30 ) { |
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0
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0
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return Future->fail( "Expected dummy bit LOW" ); |
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} |
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1
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if( $value & 1<<31 ) { |
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0
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return Future->done( { EOC => 0 } ); |
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} |
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1
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my $sig = ( $value & 1<<29 ) > 0; |
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my $exr = ( $value & 1<<28 ) > 0; |
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$value &= ( 1<<28 )-1; |
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$value >>= 4; |
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return { |
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EOC => 1, |
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SIG => $sig, |
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EXR => $exr, |
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VALUE => $value, |
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}; |
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} |
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95
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=head1 AUTHOR |
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97
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Paul Evans |
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99
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=cut |
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101
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0x55AA; |