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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, 2018-2023 -- leonerd@leonerd.org.uk |
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326710
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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::MCP3221 0.15; |
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class Device::Chip::MCP3221 |
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:isa(Device::Chip); |
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use Future::AsyncAwait; |
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use constant PROTOCOL => "I2C"; |
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=encoding UTF-8 |
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=head1 NAME |
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C - chip driver for F |
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=head1 SYNOPSIS |
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use Device::Chip::MCP3221; |
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use Future::AsyncAwait; |
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my $chip = Device::Chip::MCP3221->new; |
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await $chip->mount( Device::Chip::Adapter::...->new ); |
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printf "The reading is %d\n", await $chip->read_adc; |
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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. |
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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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=head1 MOUNT PARAMETERS |
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=head2 addr |
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The I²C address of the device. Can be specified in decimal, octal or hex with |
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leading C<0> or C<0x> prefixes. |
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=cut |
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sub I2C_options ( $, %params ) |
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{ |
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my $addr = delete $params{addr} // 0x4D; |
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$addr = oct $addr if $addr =~ m/^0/; |
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return ( |
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addr => $addr, |
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max_bitrate => 400E3, |
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); |
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} |
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=head1 METHODS |
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The following methods documented in an C expression return L |
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instances. |
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=cut |
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# Chip has no config registers |
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async method read_config () { return {} } |
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async method change_config (%) { } |
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=head2 read_adc |
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$value = await $chip->read_adc; |
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Performs a conversion and returns the result as a plain unsigned 12-bit |
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integer. |
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=cut |
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async method read_adc () |
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{ |
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my $buf = await $self->protocol->read( 2 ); |
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10734
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return unpack "S>", $buf; |
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} |
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=head2 read_adc_ratio |
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$ratio = await $chip->read_adc_ratio; |
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Performs a conversion and returns the result as a floating-point number |
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between 0 and 1. |
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=cut |
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async method read_adc_ratio () |
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{ |
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# MCP3221 is 12-bit |
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return ( await $self->read_adc ) / 2**12; |
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} |
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=head1 AUTHOR |
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Paul Evans |
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=cut |
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0x55AA; |