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     from adafruit_blinka.microcontroller.tegra.t210.pin import Pin
  24 elif detector.chip.T186:
  25     from adafruit_blinka.microcontroller.tegra.t186.pin import Pin
  26 elif detector.chip.T194:
  27     from adafruit_blinka.microcontroller.tegra.t194.pin import Pin
  28 elif detector.chip.S905:
  29     from adafruit_blinka.microcontroller.amlogic.s905.pin import Pin
  30 elif detector.chip.APQ8016:
  31   from adafruit_blinka.microcontroller.snapdragon.apq8016.pin import Pin
  32 elif detector.chip.IMX8MX:
  33     from adafruit_blinka.microcontroller.nxp_imx8m.pin import Pin
  34 elif detector.chip.STM32:
  35     from machine import Pin
  36 from adafruit_blinka import Enum, ContextManaged
  37
  38 class DriveMode(Enum):
  39     PUSH_PULL = None
  40     OPEN_DRAIN = None
  41
  42
  43 DriveMode.PUSH_PULL = DriveMode()
  44 DriveMode.OPEN_DRAIN = DriveMode()
  45
  46
  47 class Direction(Enum):
  48     INPUT = None
  49     OUTPUT = None
  50
  51
  52 Direction.INPUT = Direction()
  53 Direction.OUTPUT = Direction()
  54
  55
  56 class Pull(Enum):
  57     UP = None
  58     DOWN = None
  59     #NONE=None
  60
  61
  62 Pull.UP = Pull()
  63 Pull.DOWN = Pull()
  64
  65 #Pull.NONE = Pull()
  66
  67
  68 class DigitalInOut(ContextManaged):
  69     _pin = None
  70
  71     def __init__(self, pin):
  72         self._pin = Pin(pin.id)
  73         self.direction = Direction.INPUT
  74
  75     def switch_to_output(self, value=False, drive_mode=DriveMode.PUSH_PULL):
  76         self.direction = Direction.OUTPUT
  77         self.value = value
  78         self.drive_mode = drive_mode
  79
  80     def switch_to_input(self, pull=None):
  81         self.direction = Direction.INPUT
  82         self.pull = pull
  83
  84     def deinit(self):
  85         del self._pin
  86
  87     @property
  88     def direction(self):
  89         return self.__direction
  90
  91     @direction.setter
  92     def direction(self, dir):
  93         self.__direction = dir
  94         if dir is Direction.OUTPUT:
  95             self._pin.init(mode=Pin.OUT)
  96             self.value = False
  97             self.drive_mode = DriveMode.PUSH_PULL
  98         elif dir is Direction.INPUT:
  99             self._pin.init(mode=Pin.IN)
 100             self.pull = None
 101         else:
 102             raise AttributeError("Not a Direction")
 103
 104     @property
 105     def value(self):
 106         return self._pin.value() is 1
 107
 108     @value.setter
 109     def value(self, val):
 110         if self.direction is Direction.OUTPUT:
 111             self._pin.value(1 if val else 0)
 112         else:
 113             raise AttributeError("Not an output")
 114
 115     @property
 116     def pull(self):
 117         if self.direction is Direction.INPUT:
 118             return self.__pull
 119         else:
 120             raise AttributeError("Not an input")
 121
 122     @pull.setter
 123     def pull(self, pul):
 124         if self.direction is Direction.INPUT:
 125             self.__pull = pul
 126             if pul is Pull.UP:
 127                 self._pin.init(mode=Pin.IN, pull=Pin.PULL_UP)
 128             elif pul is Pull.DOWN:
 129                 if hasattr(Pin, "PULL_DOWN"):
 130                     self._pin.init(mode=Pin.IN, pull=Pin.PULL_DOWN)
 131                 else:
 132                     raise NotImplementedError("{} unsupported on {}".format(
 133                         Pull.DOWN, board_id))
 134             elif pul is None:
 135                 self._pin.init(mode=Pin.IN, pull=None)
 136             else:
 137                 raise AttributeError("Not a Pull")
 138         else:
 139             raise AttributeError("Not an input")
 140
 141     @property
 142     def drive_mode(self):
 143         if self.direction is Direction.OUTPUT:
 144             return self.__drive_mode  #
 145         else:
 146             raise AttributeError("Not an output")
 147
 148     @drive_mode.setter
 149     def drive_mode(self, mod):
 150         self.__drive_mode = mod
 151         if mod is DriveMode.OPEN_DRAIN:
 152             self._pin.init(mode=Pin.OPEN_DRAIN)
 153         elif mod is DriveMode.PUSH_PULL:
 154             self._pin.init(mode=Pin.OUT)