-- PCA8574 I2C GPIO expander device services -- Copyright (C)2017-2023, 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 I2C; PACKAGE PCA8574 IS PCA8574_Error : EXCEPTION; TYPE Byte IS MOD 256; TYPE DeviceClass IS TAGGED PRIVATE; TYPE Device IS ACCESS DeviceClass; MaxSpeed : CONSTANT := I2C.SpeedStandard; -- Limit for older PCF8574 -- PCA8574 device object constructor FUNCTION Create (bus : NOT NULL I2C.Bus; addr : I2C.Address; states : Byte := 16#FF#) RETURN Device; -- PCA8574 methods FUNCTION Get(Self : IN OUT DeviceClass) RETURN Byte; PROCEDURE Put(Self : IN OUT DeviceClass; data : Byte); PRIVATE -- Complete the definition for PCA8574.DeviceClass TYPE DeviceClass IS TAGGED RECORD bus : I2C.Bus; addr : I2C.Address; latch : Byte; END RECORD; END PCA8574;