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   return $smbus;
}
 
=item update
 
This updates the values set to the LED registers to the LEDs and changes
the display.
 
=cut
 
sub update
{
   my ( $self ) = @_;
    
   return $self->_write_byte(CMD_UPDATE, 0xFF);
}
 
=item enable_output
 
This sets the state of the device to active.