-- Abstract PWM output interface definitions

-- Copyright (C)2026, 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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-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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-- POSSIBILITY OF SUCH DAMAGE.

WITH IO_Interfaces;

PACKAGE PWM IS

  Error : EXCEPTION;

  TYPE DutyCycle IS NEW Long_Float RANGE 0.0 .. 100.0;

  MinimumDutyCycle : CONSTANT DutyCycle := DutyCycle'First;
  MaximumDutyCycle : CONSTANT DutyCycle := DutyCycle'Last;

  -- Instantiate abstract interfaces packages

  PACKAGE Interfaces IS NEW IO_Interfaces(DutyCycle);

  -- Define an abstract interface for PWM 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 PWM;