NAME

Device::Chip::INA219 - chip driver for an INA219

SYNOPSIS

            

              
              
use Device::Chip::INA219;
use Future::AsyncAwait;
my $chip = Device::Chip::INA219->new;
await $chip->mount( Device::Chip::Adapter::...->new );
printf "Current bus voltage is %d mV, shunt voltage is %d uV\n",
   await $chip->read_bus_voltage, await $chip->read_shunt_voltage;
            
          

DESCRIPTION

This Device::Chip subclass provides specific communication to a Texas Instruments INA219 attached to a computer via an I²C adapter.

The reader is presumed to be familiar with the general operation of this chip; the documentation here will not attempt to explain or define chip-specific concepts or features, only the use of this module to access them.

MOUNT PARAMETERS

addr

The I²C address of the device. Can be specified in decimal, octal or hex with leading 0 or 0x prefixes.

METHODS

The following methods documented in an await expression return Future instances.

read_config

            

              
              
$config = await $chip->read_config;
            
          

Reads and returns the current chip configuration as a HASH reference.

            

              
              
RST        => BOOL
BRNG       => "16V" | "32V"
PG         => "40mV" | "80mV" | "160mV" | "320mV"
BADC       => "9b" | "10b" | "11b" | "12b" | 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128
SADC       => as above
MODE_CONT  => BOOL
MODE_BUS   => BOOL
MODE_SHUNT => BOOL
            
          

change_config

            

              
              
await $chip->change_config( %config );
            
          

Changes the configuration. Any field names not mentioned will be preserved.

read_shunt_voltage

            

              
              
$uv = await $chip->read_shunt_voltage;
            
          

Returns the current shunt voltage reading scaled integer in microvolts.

read_bus_voltage

            

              
              
$mv = await $chip->read_bus_voltage;
( $mv, $ovf, $cnvr ) = await $chip->read_bus_voltage;
            
          

Returns the current bus voltage reading, as a scaled integer in milivolts.

The returned Future also yields the OVF and CNVR flags.

AUTHOR

Paul Evans <leonerd@leonerd.org.uk>