-- Abstract motor control interface definitions

-- Copyright (C)2017-2023, Philip Munts dba Munts Technologies.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- * Redistributions of source code must retain the above copyright notice,
--   this list of conditions and the following disclaimer.
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WITH Ada.Text_IO;
WITH IO_Interfaces;

PACKAGE Motor IS

  Motor_Error : EXCEPTION;

  -- Define a normalized velocity type.  Full speed ahead is 1.0, and
  -- full speed astern is -1.0.

  TYPE Velocity IS NEW Float RANGE -1.0 .. +1.0;

  -- Instantiate text I/O package

  PACKAGE Velocity_IO IS NEW Ada.Text_IO.Float_IO(Velocity);

  -- Instantiate abstract interfaces package

  PACKAGE Interfaces IS NEW IO_Interfaces(Velocity);

  -- Define an abstract interface for motor outputs, derived from
  -- Interfaces.OutputInterface

  TYPE OutputInterface IS INTERFACE AND Interfaces.OutputInterface;

  -- Define an access type compatible with any subclass implementing
  -- OutputInterface

  TYPE Output IS ACCESS ALL OutputInterface'Class;

END Motor;