-- Abstract interface for SPI devices -- 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. PACKAGE SPI IS -- Define an exception for SPI errors SPI_Error : EXCEPTION; -- Type definitions TYPE Byte IS MOD 256; TYPE Command IS ARRAY (Natural RANGE <>) OF Byte; TYPE Response IS ARRAY (Natural RANGE <>) OF Byte; TYPE MicroSeconds IS RANGE 0 .. 65536; -- Define an abstract interface for SPI devices TYPE DeviceInterface IS INTERFACE; -- Define an access type compatible with any subclass implementing -- SPI.DeviceInterface TYPE Device IS ACCESS ALL SPI.DeviceInterface'Class; -- Write only SPI bus cycle method PROCEDURE Write (Self : DeviceInterface; cmd : Command; cmdlen : Natural) IS ABSTRACT; -- Read only SPI bus cycle method PROCEDURE Read (Self : DeviceInterface; resp : OUT Response; resplen : Natural) IS ABSTRACT; -- Combined Write/Read SPI bus cycle method PROCEDURE Transaction (Self : DeviceInterface; cmd : Command; cmdlen : Natural; resp : OUT Response; resplen : Natural; delayus : MicroSeconds := 0) IS ABSTRACT; END SPI;