eavmlib

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%   Copyright 2020 by Davide Bettio <davide@uninstall.it>                 %
%                                                                         %
%   This program is free software; you can redistribute it and/or modify  %
%   it under the terms of the GNU Lesser General Public License as        %
%   published by the Free Software Foundation; either version 2 of the    %
%   License, or (at your option) any later version.                       %
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%   This program is distributed in the hope that it will be useful,       %
%   but WITHOUT ANY WARRANTY; without even the implied warranty of        %
%   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         %
%   GNU General Public License for more details.                          %
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%   You should have received a copy of the GNU General Public License     %
%   along with this program; if not, write to the                         %
%   Free Software Foundation, Inc.,                                       %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

-module(uart).
-export([open/2, read/1, write/2]).

open(Name, Opts) ->
    open_port({spawn, "uart"}, [{name, Name} | Opts]).

read(Pid) ->
    call(Pid, read).

write(Pid, B) ->
    call(Pid, {write, B}).

call(DriverPid, Msg) ->
    Ref = erlang:make_ref(),
    DriverPid ! {self(), Ref, Msg},
    receive
        {Ref, Ret} ->
            Ret
    end.