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defmodule HMC5883L.EventHandler do
use GenEvent
alias HMC5883L.SensorState
import HMC5883L.Utilities
require Logger
def init(args) do
{:ok, args}
end
def handle_event(event, args) do
process_event(event, args)
{:ok, args}
end
defp process_event({:error, error}, _), do: Logger.warn("Driver error #{error}")
defp process_event({:raw_reading, msg}, args) do
update_state({:raw, msg}, args)
{x, y, z} = msg
%{axis_gauss: {xy_gauss,z_gauss}} = SensorState.axis_gauss(args.state_name)
sx = x / xy_gauss * 100
sy = y / xy_gauss * 100
sz = z / z_gauss * 100
GenEvent.notify(args.evtmgr_name, {:scaled_reading, {sx, sy, sz}})
end
defp process_event({:scaled_reading, msg}, args) do
update_state({:scaled, msg}, args)
{x, y, _z} = msg
heading = :math.atan2(y,x) |> bearing_to_degrees
GenEvent.notify(args.evtmgr_name, {:heading, heading})
end
defp process_event({type, _val} = event, args)
when type in [:heading, :available] do
update_state(event, args)
GenEvent.notify(args.evtmgr_name, event)
end
defp process_event({type, msg}, _args)
when is_atom(type) do
Logger.warn("Unknown event received.\nType: #{type}\nMsg: #{inspect msg}")
end
defp process_event(event, _args) do
Logger.warn("Unknown event received.\n#{inspect event}")
end
defp update_state(event, args) do
SensorState.update(args.state_name, event)
event
end
end