Created
June 26, 2017 22:13
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defmodule Zwave.Controller do | |
@moduledoc """ | |
Handles low level Zwave control | |
""" | |
alias Zwave.{ | |
ControllerLocator, | |
Configuration, | |
Status, | |
} | |
use Status | |
@soft_reset_command <<0x08>> | |
@type t :: %Zwave.Controller{ | |
config: Configuration.t | |
} | |
defstruct [:port, :name, :uart, :gpio, :config] | |
@spec init(Configuration.t) | |
:: t | |
def init(configuration) do | |
%__MODULE__{config: configuration} | |
end | |
@spec start(%__MODULE__{ | |
port: binary, | |
name: String.t, | |
config: Configuration.t | |
} | |
| {:error, any}) | |
:: %__MODULE__{ | |
port: binary, | |
uart: pid, | |
gpio: pid | :none, | |
name: String.t, | |
config: Configuration.t, | |
} | |
| {:error, any} | |
def start({:error, _} = error), do: error | |
def start(%__MODULE__{port: port, config: config} = controller) do | |
with {:ok, uart} <- start_uart(config), | |
{:ok, gpio} <- start_gpio(config), | |
:ok <- open_serial_port(config, uart, port), | |
do: %{controller | uart: uart, gpio: gpio} | |
end | |
def reset(%{gpio: :none} = controller), do: soft_reset(controller) | |
def reset(controller), do: hard_reset(controller) | |
@spec soft_reset( | |
%__MODULE__{ | |
uart: pid, | |
port: String.t, | |
config: Configuration.t, | |
} | |
) | |
:: :ok | |
def soft_reset(%{uart: uart, port: port, config: config} = controller) do | |
close_serial_port(config, uart) | |
open_serial_port(config, uart, port) | |
write(controller, Status.not_acknowledge) | |
write(controller, @soft_reset_command) | |
Process.sleep(1_500) | |
:ok | |
end | |
@spec hard_reset( | |
%__MODULE__{ | |
uart: pid, | |
gpio: pid, | |
port: String.t, | |
config: Configuration.t, | |
} | |
) | |
:: :ok | |
def hard_reset(%{uart: uart, gpio: gpio, port: port, config: config}) do | |
close_serial_port(config, uart) | |
assert_module_reset(config, gpio) | |
open_serial_port(config, uart, port) | |
release_module_reset(config, gpio) | |
Process.sleep(500) | |
:ok | |
end | |
@spec find(%__MODULE__{config: Configuration.t}) | |
:: %__MODULE__{ | |
port: integer, | |
name: String.t, | |
config: Configuration.t, | |
} | |
| {:error, :no_controller} | |
def find(%{config: config}) do | |
case ControllerLocator.find(config.uart.enumerate) do | |
%__MODULE__{} = controller -> %{controller | config: config} | |
error -> error | |
end | |
end | |
@spec write(%__MODULE__{ | |
uart: pid, | |
config: Configuration.t, | |
}, Zwave.wire_protocol | Zwave.command) | |
:: :ok | |
| {:error, any} | |
def write(controller, {_, data}) do | |
write(controller, data) | |
end | |
def write(%{uart: pid, config: %{uart: uart}}, data) do | |
uart.write(pid, data) | |
end | |
@spec start_uart(Configuration.t) | |
:: {:ok, pid} | {:error, any} | |
defp start_uart(%{uart: uart}) do | |
uart.start_link | |
end | |
@spec start_gpio(Configuration.t) | |
:: {:ok, pid | :none} | |
defp start_gpio(%Configuration{reset_pin: :none}), do: {:ok, :none} | |
defp start_gpio(%Configuration{gpio: gpio, reset_pin: reset_pin}) do | |
gpio.start_link(reset_pin, :output) | |
end | |
@spec open_serial_port(Configuration.t, pid, port :: String.t) | |
:: :ok | |
| {:error, term} | |
defp open_serial_port(%Configuration{uart: uart}, pid, port) do | |
uart.open(pid, | |
port, | |
active: true, | |
speed: 115_200, | |
framing: Zwave.Framing) | |
end | |
@spec close_serial_port(Configuration.t, pid) | |
:: :ok | |
| {:error, term} | |
defp close_serial_port(%{uart: uart}, pid) do | |
uart.close(pid) | |
end | |
@spec assert_module_reset(Configuration.t, pid) | |
:: :ok | |
| {:error, term} | |
defp assert_module_reset(%{gpio: gpio}, pid) do | |
gpio.write(pid, 0) | |
end | |
@spec release_module_reset(Configuration.t, pid) | |
:: :ok | |
| {:error, term} | |
defp release_module_reset(%{gpio: gpio}, pid) do | |
gpio.write(pid, 1) | |
end | |
end |
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