-- Mikroelektronika Click Board shield services, using libsimpleio
-- Copyright (C)2016-2018, Philip Munts, President, Munts AM Corp.
--
-- 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.Characters.Handling;
WITH Ada.Environment_Variables;
WITH Ada.Strings.Fixed;
PACKAGE BODY ClickBoard.Shields IS
FUNCTION getenv(name : String) RETURN String IS
BEGIN
IF Ada.Environment_Variables.Exists(name) THEN
RETURN Ada.Characters.Handling.To_Lower(Ada.Environment_Variables.Value(name));
ELSE
RETURN "";
END IF;
END getenv;
FUNCTION matchenv(name: String; target : String) RETURN Boolean IS
BEGIN
RETURN Ada.Strings.Fixed.Index(getenv(name), target) = 1;
END matchenv;
FUNCTION Detect RETURN Kind IS
BEGIN
-- First, try to get the shield from the SHIELDNAME environment variable:
BEGIN
RETURN ClickBoard.Shields.Kind'Value(getenv("SHIELDNAME"));
EXCEPTION
WHEN OTHERS => NULL;
END;
-- The nifty PocketBeagle doesn't need a shield!
IF matchenv("BOARDNAME", "pocketbeagle") THEN
RETURN ClickBoard.Shields.PocketBeagle;
END IF;
-- In the absence of SHIELDNAME, assume the Beagle Bone Click Shield
-- (MIKROE-1596) for all BeagleBone boards
-- TODO: The Beagle Bone Click Shield (MIKROE-1596) has been replaced
-- by the Mikrobus Cape (MIKROE-1857). At some point we may want to
-- change the default shield from BeagleBoneClick2 to BeagleBoneClick4.
IF matchenv("BOARDNAME", "beaglebone") OR matchenv("OSNAME", "beagle") THEN
RETURN ClickBoard.Shields.BeagleBoneClick2;
END IF;
-- In the absence of SHIELDNAME, assume the Pi 3 Click Shield
-- (MIKROE-2756) for all Raspberry Pi boards
IF matchenv("BOARDNAME", "raspberrypi") OR matchenv("OSNAME", "raspberrypi") THEN
RETURN ClickBoard.Shields.PiClick3;
END IF;
RAISE ShieldError WITH "Cannot identify the ClickBoard shield";
END Detect;
END ClickBoard.Shields;