' ADC input wrapper class

' Copyright (C)2018-2023, 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
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class ADC_Input
  var mystepsize = -1
  var myfd       = -1

  ' resolution : A/D converter resolution in bits
  ' reference  : A/D converter full scale voltage in volts

  def Open(chip, channel, resolution, reference)
    mystepsize = reference/2.0^resolution
    myfd       = libsimpleio.adc_open(chip, channel)
  enddef

  def Close()
    libsimpleio.adc_close(myfd)
    mystepsize = -1
    myfd       = -1
  enddef

  def Read()
    return libsimpleio.adc_read(myfd)*mystepsize
  enddef
endclass