74 lines
1.8 KiB
Elixir
74 lines
1.8 KiB
Elixir
defmodule FarmbotFirmware.UARTTransport do
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@moduledoc """
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Handles sending/receiving GCODEs over UART.
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This is the mechanism that official Farmbot's communicate with
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official Farmbot-Arduino-Firmware's over.
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"""
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alias FarmbotFirmware.{GCODE, UartDefaultAdapter}
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use GenServer
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require Logger
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@error_retry_ms 5_000
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def init(args) do
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device = Keyword.fetch!(args, :device)
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handle_gcode = Keyword.fetch!(args, :handle_gcode)
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reset = Keyword.fetch!(args, :reset)
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{:ok, uart} = UartDefaultAdapter.start_link()
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{:ok,
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%{
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uart: uart,
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device: device,
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open: false,
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handle_gcode: handle_gcode,
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reset: reset
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}, 0}
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end
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def terminate(_, %{uart: uart}) do
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UartDefaultAdapter.stop(uart)
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end
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def handle_info(:timeout, %{open: false} = state) do
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opts = UartDefaultAdapter.generate_opts()
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with :ok <- open(state.uart, state.device, opts),
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:ok <- reset(state) do
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{:noreply, %{state | open: true}}
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else
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{:error, reason} ->
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Logger.error("Error opening #{state.device}: #{inspect(reason)}")
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{:noreply, %{state | open: false}, @error_retry_ms}
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end
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end
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def handle_info({:circuits_uart, _, {:error, reason}}, state) do
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{:stop, {:uart_error, reason}, state}
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end
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def handle_info({:circuits_uart, _, data}, state) when is_binary(data) do
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code = GCODE.decode(String.trim(data))
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state.handle_gcode.(code)
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{:noreply, state}
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end
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def handle_call(code, _from, state) do
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str = GCODE.encode(code)
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r = UartDefaultAdapter.write(state.uart, str)
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{:reply, r, state}
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end
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def reset(state) do
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if module = state[:reset] do
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module.reset()
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else
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:ok
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end
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end
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def open(uart_pid, device_path, opts) do
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UartDefaultAdapter.open(uart_pid, device_path, opts)
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end
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end
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