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grisp

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GRiSP Erlang Runtime Library

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grisp src grisp_gpio_drv.erl
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src/grisp_gpio_drv.erl 

% @private

-module(grisp_gpio_drv).



% API

-export([open/0]).

-export([command/2]).



%--- Macros --------------------------------------------------------------------



-define(PORT_COMMAND_TIMEOUT, 1000).



%--- API -----------------------------------------------------------------------



open() -> open_port({spawn_driver, "grisp_gpio_drv"}, [binary]).



command(Port, Command) ->

    Port ! {self(), {command, Command}},

    receive

        {Port, {data, Resp}} ->

            Resp

    after ?PORT_COMMAND_TIMEOUT ->

            exit({gpio_driver_timeout, Command})

    end.