-- MCP3202 Analog to Digital Converter 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 Analog; WITH SPI; PACKAGE MCP3202 IS Resolution : CONSTANT := 12; -- SPI interface characteristics SPI_Mode : CONSTANT Natural := 0; SPI_WordSize : CONSTANT Natural := 8; SPI_Frequency : CONSTANT Natural := 1_000_000; -- 0.9 MHz at 2.7V, 1.8 MHz at 5V -- Define a subclass of Analog.InputInterface TYPE InputSubclass IS NEW Analog.InputInterface WITH PRIVATE; -- Define some types for analog input channels TYPE Configuration IS (SingleEnded, Differential); TYPE Channel IS NEW Natural RANGE 0 .. 1; -- Constructors -- If the input configuration is Differential, the channel parameter -- selects IN+. IN- is inferred to be the other input of the pair. FUNCTION Create (spidev : NOT NULL SPI.Device; chan : Channel; config : Configuration := SingleEnded) RETURN Analog.Input; -- Methods FUNCTION Get(Self : IN OUT InputSubclass) RETURN Analog.Sample; FUNCTION GetResolution(Self : IN OUT InputSubclass) RETURN Positive; PRIVATE TYPE InputSubclass IS NEW Analog.InputInterface WITH RECORD spidev : SPI.Device; cmd : SPI.Byte; END RECORD; END MCP3202;