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Elixir Z-Wave library
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lib/grizzly/zwave/command_classes/switch_support.ex
defmodule Grizzly.ZWave.CommandClasses.SwitchSupport do
@moduledoc """
Support for Switch Binary and Switch Multilevel Command Classes
"""
alias Grizzly.ZWave.DecodeError
# Duration in seconds, or the manufacturer's default
@type duration :: :default | 0..7620
# Duration encoding
# * 0 -> instantly
# * 1..127 -> seconds
# * 128..254 -> minutes + 127
# * 255 -> factory default (option v2)
@doc """
Encode a duration into a byte according to the Z-Wave specs
"""
@spec duration_to_byte(duration()) :: byte()
def duration_to_byte(:default), do: 255
def duration_to_byte(seconds) when seconds in 0..127, do: seconds
def duration_to_byte(seconds) when seconds in 128..7620 do
minutes = div(seconds, 60)
127 + minutes
end
# Force duration values within supported bounds
def duration_to_byte(seconds) when seconds > 7620, do: 254
def duration_to_byte(seconds) when seconds < 0, do: 0
@doc """
Decode a duration from a byte according to the Z-Wave specs
"""
@spec duration_from_byte(byte()) ::
{:error, DecodeError.t()} | {:ok, duration()}
def duration_from_byte(255), do: {:ok, :default}
def duration_from_byte(byte) when byte in 0..127, do: {:ok, byte}
def duration_from_byte(byte) when byte in 128..254, do: {:ok, (byte - 127) * 60}
def duration_from_byte(byte),
do: {:error, %DecodeError{value: byte, param: :duration, command: :switch_multilevel_report}}
end