-- Abstract PWM output 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 PWM IS PWM_Error : EXCEPTION; TYPE DutyCycle IS NEW Float RANGE 0.0 .. 100.0; MinimumDutyCycle : CONSTANT DutyCycle := DutyCycle'First; MaximumDutyCycle : CONSTANT DutyCycle := DutyCycle'Last; -- Instantiate text I/O packages PACKAGE DutyCycle_IO IS NEW Ada.Text_IO.Float_IO(DutyCycle); PACKAGE Duration_IO IS NEW Ada.Text_IO.Fixed_IO(Duration); -- Instantiate abstract interfaces packages PACKAGE DutyCycleInterfaces IS NEW IO_Interfaces(DutyCycle); PACKAGE DurationInterfaces IS NEW IO_Interfaces(Duration); -- Define an abstract interface for GPIO pins, derived from both -- DutyCycleInterfacesInterfaces.OutputInterface and -- DurationInterfaces.OutputInterface TYPE OutputInterface IS INTERFACE AND DutyCycleInterfaces.OutputInterface AND DurationInterfaces.OutputInterface; -- Define an access type compatible with any subclass implementing -- OutputInterface TYPE Output IS ACCESS ALL OutputInterface'Class; -- Additional methods FUNCTION GetPeriod(Self : IN OUT OutputInterface) RETURN Duration IS ABSTRACT; END PWM;