src/digitalio.py

   1 """
   2 `digitalio` - Digital input and output control
   3 =================================================
   4
   5 See `CircuitPython:digitalio` in CircuitPython for more details.
   6
   7 * Author(s): cefn
   8 """
   9
  10 from adafruit_blinka.agnostic import board_id, detector
  11
  12 # pylint: disable=ungrouped-imports,wrong-import-position
  13
  14 if detector.chip.BCM2XXX:
  15     from adafruit_blinka.microcontroller.bcm283x.pin import Pin
  16 elif detector.chip.AM33XX:
  17     from adafruit_blinka.microcontroller.am335x.pin import Pin
  18 elif detector.chip.SUN8I:
  19     from adafruit_blinka.microcontroller.allwinner_h3.pin import Pin
  20 elif detector.chip.SAMA5:
  21     from adafruit_blinka.microcontroller.sama5.pin import Pin
  22 elif detector.chip.T210:
  23     if detector.board.JETSON_TX1:
  24         from adafruit_blinka.microcontroller.tegra.t210.x1_pin import Pin
  25     elif detector.board.JETSON_TXX:
  26         from adafruit_blinka.microcontroller.tegra.t210.xx_pin import Pin
  27 elif detector.chip.T186:
  28     from adafruit_blinka.microcontroller.tegra.t186.pin import Pin
  29 elif detector.chip.T194:
  30     from adafruit_blinka.microcontroller.tegra.t194.pin import Pin
  31 elif detector.chip.STM32:
  32     from machine import Pin
  33 from adafruit_blinka import Enum, ContextManaged
  34
  35 class DriveMode(Enum):
  36     PUSH_PULL = None
  37     OPEN_DRAIN = None
  38
  39
  40 DriveMode.PUSH_PULL = DriveMode()
  41 DriveMode.OPEN_DRAIN = DriveMode()
  42
  43
  44 class Direction(Enum):
  45     INPUT = None
  46     OUTPUT = None
  47
  48
  49 Direction.INPUT = Direction()
  50 Direction.OUTPUT = Direction()
  51
  52
  53 class Pull(Enum):
  54     UP = None
  55     DOWN = None
  56     #NONE=None
  57
  58
  59 Pull.UP = Pull()
  60 Pull.DOWN = Pull()
  61
  62 #Pull.NONE = Pull()
  63
  64
  65 class DigitalInOut(ContextManaged):
  66     _pin = None
  67
  68     def __init__(self, pin):
  69         self._pin = Pin(pin.id)
  70         self.direction = Direction.INPUT
  71
  72     def switch_to_output(self, value=False, drive_mode=DriveMode.PUSH_PULL):
  73         self.direction = Direction.OUTPUT
  74         self.value = value
  75         self.drive_mode = drive_mode
  76
  77     def switch_to_input(self, pull=None):
  78         self.direction = Direction.INPUT
  79         self.pull = pull
  80
  81     def deinit(self):
  82         del self._pin
  83
  84     @property
  85     def direction(self):
  86         return self.__direction
  87
  88     @direction.setter
  89     def direction(self, dir):
  90         self.__direction = dir
  91         if dir is Direction.OUTPUT:
  92             self._pin.init(mode=Pin.OUT)
  93             self.value = False
  94             self.drive_mode = DriveMode.PUSH_PULL
  95         elif dir is Direction.INPUT:
  96             self._pin.init(mode=Pin.IN)
  97             self.pull = None
  98         else:
  99             raise AttributeError("Not a Direction")
 100
 101     @property
 102     def value(self):
 103         return self._pin.value() is 1
 104
 105     @value.setter
 106     def value(self, val):
 107         if self.direction is Direction.OUTPUT:
 108             self._pin.value(1 if val else 0)
 109         else:
 110             raise AttributeError("Not an output")
 111
 112     @property
 113     def pull(self):
 114         if self.direction is Direction.INPUT:
 115             return self.__pull
 116         else:
 117             raise AttributeError("Not an input")
 118
 119     @pull.setter
 120     def pull(self, pul):
 121         if self.direction is Direction.INPUT:
 122             self.__pull = pul
 123             if pul is Pull.UP:
 124                 self._pin.init(mode=Pin.IN, pull=Pin.PULL_UP)
 125             elif pul is Pull.DOWN:
 126                 if hasattr(Pin, "PULL_DOWN"):
 127                     self._pin.init(mode=Pin.IN, pull=Pin.PULL_DOWN)
 128                 else:
 129                     raise NotImplementedError("{} unsupported on {}".format(
 130                         Pull.DOWN, board_id))
 131             elif pul is None:
 132                 self._pin.init(mode=Pin.IN, pull=None)
 133             else:
 134                 raise AttributeError("Not a Pull")
 135         else:
 136             raise AttributeError("Not an input")
 137
 138     @property
 139     def drive_mode(self):
 140         if self.direction is Direction.OUTPUT:
 141             return self.__drive_mode  #
 142         else:
 143             raise AttributeError("Not an output")
 144
 145     @drive_mode.setter
 146     def drive_mode(self, mod):
 147         self.__drive_mode = mod
 148         if mod is DriveMode.OPEN_DRAIN:
 149             self._pin.init(mode=Pin.OPEN_DRAIN)
 150         elif mod is DriveMode.PUSH_PULL:
 151             self._pin.init(mode=Pin.OUT)