Paul Evans

NAME

Device::Chip::TSL256x - chip driver for TSL256x

SYNOPSIS

 use Device::Chip::TSL256x;

 my $chip = Device::Chip::TSL256x->new;
 $chip->mount( Device::Chip::Adapter::...->new )->get;

 $chip->power(1)->get;

 sleep 1; # Wait for one integration cycle

 printf "Current ambient light level is %.2f lux\n",
    scalar $chip->read_lux->get;

DESCRIPTION

This Device::Chip subclass provides specific communication to a TAOS TSL2560 or TSL2561 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.

ACCESSORS

The following methods documented with a trailing call to ->get return Future instances.

read_config

   $config = $chip->read_config->get

Returns a HASH reference of the contents of timing control register, using fields named from the data sheet.

   GAIN  => 1 | 16
   INTEG => 13ms | 101ms | 420ms

change_config

   $chip->change_config( %changes )->get

Writes updates to the timing control register.

Note that these two methods use a cache of configuration bytes to make subsequent modifications more efficient. This cache will not respect the "one-shot" nature of the Manual bit.

read_id

   $id = $chip->read_id->get

Returns the chip's ID register value.

read_data0

read_data1

   $data0 = $chip->read_data0->get

   $data1 = $chip->read_data1->get

Reads the current values of the ADC channels.

read_data

   ( $data0, $data1 ) = $chip->read_data->get

Read the current values of both ADC channels in a single I²C transaction.

METHODS

power

   $chip->power( $on )->get

Enables or disables the main power control bits in the CONTROL register.

read_lux

   $lux = $chip->read_lux->get

   ( $lux, $data0, $data1 ) = $chip->read_lux->get

Reads the two data registers then performs the appropriate scaling calculations to return a floating-point number that approximates the light level in Lux.

Currently this conversion code presumes the contants for the T, FN and CL chip types.

In list context, also returns the raw $data0 and $data1 channel values. The controlling code may wish to use these to adjust the gain if required.

AUTHOR

Paul Evans <leonerd@leonerd.org.uk>