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defmodule WizardExample.Button do
use GenServer
@moduledoc """
This GenServer starts the wizard if a button is depressed for long enough.
"""
alias Circuits.GPIO
@doc """
Start the button monitor
Pass an index to the GPIO that's connected to the button.
"""
@spec start_link(non_neg_integer()) :: GenServer.on_start()
def start_link(gpio_pin) do
GenServer.start_link(__MODULE__, gpio_pin)
end
@impl GenServer
def init(gpio_pin) do
{:ok, gpio} = GPIO.open(gpio_pin, :input)
:ok = GPIO.set_interrupts(gpio, :both)
{:ok, %{pin: gpio_pin, gpio: gpio}}
end
@impl GenServer
def handle_info({:circuits_gpio, gpio_pin, _timestamp, 1}, %{pin: gpio_pin} = state) do
# Button pressed. Start a timer to launch the wizard when it's long enough
{:noreply, state, 5_000}
end
def handle_info({:circuits_gpio, gpio_pin, _timestamp, 0}, %{pin: gpio_pin} = state) do
# Button released. The GenServer timer is implicitly cancelled by receiving this message.
{:noreply, state}
end
def handle_info(:timeout, state) do
:ok = VintageNetWizard.run_wizard(device_info: get_device_info())
{:noreply, state}
end
defp get_device_info() do
kv =
Nerves.Runtime.KV.get_all_active()
|> kv_to_map
mac_addr = VintageNet.get(["interface", "wlan0", "mac_address"])
[
{"WiFi Address", mac_addr},
{"Serial number", serial_number()},
{"Firmware", kv["nerves_fw_product"]},
{"Firmware version", kv["nerves_fw_version"]},
{"Firmware UUID", kv["nerves_fw_uuid"]}
]
end
defp kv_to_map(key_values) do
for kv <- key_values, into: %{}, do: kv
end
defp serial_number() do
with boardid_path when not is_nil(boardid_path) <- System.find_executable("boardid"),
{id, 0} <- System.cmd(boardid_path, []) do
String.trim(id)
else
_other -> "Unknown"
end
end
end