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.S922X:
  31     from adafruit_blinka.microcontroller.amlogic.s922x.pin import Pin
  32 elif detector.chip.APQ8016:
  33   from adafruit_blinka.microcontroller.snapdragon.apq8016.pin import Pin
  34 elif detector.chip.IMX8MX:
  35     from adafruit_blinka.microcontroller.nxp_imx8m.pin import Pin
  36 elif detector.chip.STM32:
  37     from machine import Pin
  38 from adafruit_blinka import Enum, ContextManaged
  39
  40 class DriveMode(Enum):
  41     PUSH_PULL = None
  42     OPEN_DRAIN = None
  43
  44
  45 DriveMode.PUSH_PULL = DriveMode()
  46 DriveMode.OPEN_DRAIN = DriveMode()
  47
  48
  49 class Direction(Enum):
  50     INPUT = None
  51     OUTPUT = None
  52
  53
  54 Direction.INPUT = Direction()
  55 Direction.OUTPUT = Direction()
  56
  57
  58 class Pull(Enum):
  59     UP = None
  60     DOWN = None
  61     #NONE=None
  62
  63
  64 Pull.UP = Pull()
  65 Pull.DOWN = Pull()
  66
  67 #Pull.NONE = Pull()
  68
  69
  70 class DigitalInOut(ContextManaged):
  71     _pin = None
  72
  73     def __init__(self, pin):
  74         self._pin = Pin(pin.id)
  75         self.direction = Direction.INPUT
  76
  77     def switch_to_output(self, value=False, drive_mode=DriveMode.PUSH_PULL):
  78         self.direction = Direction.OUTPUT
  79         self.value = value
  80         self.drive_mode = drive_mode
  81
  82     def switch_to_input(self, pull=None):
  83         self.direction = Direction.INPUT
  84         self.pull = pull
  85
  86     def deinit(self):
  87         del self._pin
  88
  89     @property
  90     def direction(self):
  91         return self.__direction
  92
  93     @direction.setter
  94     def direction(self, dir):
  95         self.__direction = dir
  96         if dir is Direction.OUTPUT:
  97             self._pin.init(mode=Pin.OUT)
  98             self.value = False
  99             self.drive_mode = DriveMode.PUSH_PULL
 100         elif dir is Direction.INPUT:
 101             self._pin.init(mode=Pin.IN)
 102             self.pull = None
 103         else:
 104             raise AttributeError("Not a Direction")
 105
 106     @property
 107     def value(self):
 108         return self._pin.value() is 1
 109
 110     @value.setter
 111     def value(self, val):
 112         if self.direction is Direction.OUTPUT:
 113             self._pin.value(1 if val else 0)
 114         else:
 115             raise AttributeError("Not an output")
 116
 117     @property
 118     def pull(self):
 119         if self.direction is Direction.INPUT:
 120             return self.__pull
 121         else:
 122             raise AttributeError("Not an input")
 123
 124     @pull.setter
 125     def pull(self, pul):
 126         if self.direction is Direction.INPUT:
 127             self.__pull = pul
 128             if pul is Pull.UP:
 129                 self._pin.init(mode=Pin.IN, pull=Pin.PULL_UP)
 130             elif pul is Pull.DOWN:
 131                 if hasattr(Pin, "PULL_DOWN"):
 132                     self._pin.init(mode=Pin.IN, pull=Pin.PULL_DOWN)
 133                 else:
 134                     raise NotImplementedError("{} unsupported on {}".format(
 135                         Pull.DOWN, board_id))
 136             elif pul is None:
 137                 self._pin.init(mode=Pin.IN, pull=None)
 138             else:
 139                 raise AttributeError("Not a Pull")
 140         else:
 141             raise AttributeError("Not an input")
 142
 143     @property
 144     def drive_mode(self):
 145         if self.direction is Direction.OUTPUT:
 146             return self.__drive_mode  #
 147         else:
 148             raise AttributeError("Not an output")
 149
 150     @drive_mode.setter
 151     def drive_mode(self, mod):
 152         self.__drive_mode = mod
 153         if mod is DriveMode.OPEN_DRAIN:
 154             self._pin.init(mode=Pin.OPEN_DRAIN)
 155         elif mod is DriveMode.PUSH_PULL:
 156             self._pin.init(mode=Pin.OUT)