src/digitalio.py

   1 from machine import Pin
   2 from adafruit_blinka.agnostic import board as boardId
   3 from adafruit_blinka import Enum, ContextManaged
   4
   5
   6 class DriveMode(Enum):
   7     PUSH_PULL = None
   8     OPEN_DRAIN = None
   9
  10
  11 DriveMode.PUSH_PULL = DriveMode()
  12 DriveMode.OPEN_DRAIN = DriveMode()
  13
  14
  15 class Direction(Enum):
  16     INPUT = None
  17     OUTPUT = None
  18
  19
  20 Direction.INPUT = Direction()
  21 Direction.OUTPUT = Direction()
  22
  23
  24 class Pull(Enum):
  25     UP = None
  26     DOWN = None
  27     #NONE=None
  28
  29
  30 Pull.UP = Pull()
  31 Pull.DOWN = Pull()
  32
  33 #Pull.NONE = Pull()
  34
  35
  36 class DigitalInOut(ContextManaged):
  37     _pin = None
  38
  39     def __init__(self, pin):
  40         self._pin = Pin(pin.id)
  41         self.direction = Direction.INPUT
  42
  43     def switch_to_output(self, value=False, drive_mode=DriveMode.PUSH_PULL):
  44         self.direction = Direction.OUTPUT
  45         self.value = value
  46         self.drive_mode = drive_mode
  47
  48     def switch_to_input(self, pull=None):
  49         self.direction = Direction.INPUT
  50         self.pull = pull
  51
  52     def deinit(self):
  53         del self._pin
  54
  55     @property
  56     def direction(self):
  57         return self.__direction
  58
  59     @direction.setter
  60     def direction(self, dir):
  61         self.__direction = dir
  62         if dir is Direction.OUTPUT:
  63             self._pin.init(mode=Pin.OUT)
  64             self.value = False
  65             self.drive_mode = DriveMode.PUSH_PULL
  66         elif dir is Direction.INPUT:
  67             self._pin.init(mode=Pin.IN)
  68             self.pull = None
  69         else:
  70             raise AttributeError("Not a Direction")
  71
  72     @property
  73     def value(self):
  74         return self._pin.value() is 1
  75
  76     @value.setter
  77     def value(self, val):
  78         if self.direction is Direction.OUTPUT:
  79             self._pin.value(1 if val else 0)
  80         else:
  81             raise AttributeError("Not an output")
  82
  83     @property
  84     def pull(self):
  85         if self.direction is Direction.INPUT:
  86             return self.__pull
  87         else:
  88             raise AttributeError("Not an input")
  89
  90     @pull.setter
  91     def pull(self, pul):
  92         if self.direction is Direction.INPUT:
  93             self.__pull = pul
  94             if pul is Pull.UP:
  95                 self._pin.init(mode=Pin.IN, pull=Pin.PULL_UP)
  96             elif pul is Pull.DOWN:
  97                 if hasattr(Pin, "PULL_DOWN"):
  98                     self._pin.init(mode=Pin.IN, pull=Pin.PULL_DOWN)
  99                 else:
 100                     raise NotImplementedError("{} unsupported on {}".format(
 101                         Pull.DOWN, boardId))
 102             elif pul is None:
 103                 self._pin.init(mode=Pin.IN, pull=None)
 104             else:
 105                 raise AttributeError("Not a Pull")
 106         else:
 107             raise AttributeError("Not an input")
 108
 109     @property
 110     def drive_mode(self):
 111         if self.direction is Direction.OUTPUT:
 112             return self.__drive_mode  #
 113         else:
 114             raise AttributeError("Not an output")
 115
 116     @drive_mode.setter
 117     def drive_mode(self, mod):
 118         self.__drive_mode = mod
 119         if mod is DriveMode.OPEN_DRAIN:
 120             self._pin.init(mode=Pin.OPEN_DRAIN)
 121         elif mod is DriveMode.PUSH_PULL:
 122             self._pin.init(mode=Pin.OUT)