-- Abstract GPIO pin interface definitions -- Copyright (C)2016-2023, 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. -- -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" -- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE -- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF -- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN -- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) -- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -- POSSIBILITY OF SUCH DAMAGE. WITH Ada.Text_IO; WITH IO_Interfaces; PACKAGE GPIO IS -- Define an exception for GPIO errors GPIO_Error : EXCEPTION; -- Instantiate text I/O package PACKAGE Boolean_IO IS NEW Ada.Text_IO.Enumeration_IO(Boolean); -- Type definitions TYPE Direction IS (Input, Output); -- Instantiate I/O interfaces package for digital I/O PACKAGE Interfaces IS NEW IO_Interfaces(Boolean); -- Define an abstract interface for GPIO pins, derived from -- Interfaces.InputOutputInterface TYPE PinInterface IS INTERFACE AND Interfaces.InputOutputInterface; -- Define an access type compatible with any subclass implementing -- PinInterface TYPE Pin IS ACCESS ALL PinInterface'Class; END GPIO;