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.board.ftdi_ft232h:
  37     from adafruit_blinka.microcontroller.ft232h.pin import Pin
  38 elif detector.board.binho_nova:
  39     from adafruit_blinka.microcontroller.nova.pin import Pin
  40 elif detector.chip.STM32:
  41     from machine import Pin
  42 elif detector.board.microchip_mcp2221:
  43     from adafruit_blinka.microcontroller.mcp2221.pin import Pin
  44 elif detector.board.pine64 or detector.board.pinebook or detector.board.pinephone:
  45     from adafruit_blinka.microcontroller.allwinner.pin import Pin
  46 from adafruit_blinka import Enum, ContextManaged
  47
  48 class DriveMode(Enum):
  49     PUSH_PULL = None
  50     OPEN_DRAIN = None
  51
  52
  53 DriveMode.PUSH_PULL = DriveMode()
  54 DriveMode.OPEN_DRAIN = DriveMode()
  55
  56
  57 class Direction(Enum):
  58     INPUT = None
  59     OUTPUT = None
  60
  61
  62 Direction.INPUT = Direction()
  63 Direction.OUTPUT = Direction()
  64
  65
  66 class Pull(Enum):
  67     UP = None
  68     DOWN = None
  69     #NONE=None
  70
  71
  72 Pull.UP = Pull()
  73 Pull.DOWN = Pull()
  74
  75 #Pull.NONE = Pull()
  76
  77
  78 class DigitalInOut(ContextManaged):
  79     _pin = None
  80
  81     def __init__(self, pin):
  82         self._pin = Pin(pin.id)
  83         self.direction = Direction.INPUT
  84
  85     def switch_to_output(self, value=False, drive_mode=DriveMode.PUSH_PULL):
  86         self.direction = Direction.OUTPUT
  87         self.value = value
  88         self.drive_mode = drive_mode
  89
  90     def switch_to_input(self, pull=None):
  91         self.direction = Direction.INPUT
  92         self.pull = pull
  93
  94     def deinit(self):
  95         del self._pin
  96
  97     @property
  98     def direction(self):
  99         return self.__direction
 100
 101     @direction.setter
 102     def direction(self, dir):
 103         self.__direction = dir
 104         if dir is Direction.OUTPUT:
 105             self._pin.init(mode=Pin.OUT)
 106             self.value = False
 107             self.drive_mode = DriveMode.PUSH_PULL
 108         elif dir is Direction.INPUT:
 109             self._pin.init(mode=Pin.IN)
 110             self.pull = None
 111         else:
 112             raise AttributeError("Not a Direction")
 113
 114     @property
 115     def value(self):
 116         return self._pin.value() is 1
 117
 118     @value.setter
 119     def value(self, val):
 120         if self.direction is Direction.OUTPUT:
 121             self._pin.value(1 if val else 0)
 122         else:
 123             raise AttributeError("Not an output")
 124
 125     @property
 126     def pull(self):
 127         if self.direction is Direction.INPUT:
 128             return self.__pull
 129         else:
 130             raise AttributeError("Not an input")
 131
 132     @pull.setter
 133     def pull(self, pul):
 134         if self.direction is Direction.INPUT:
 135             self.__pull = pul
 136             if pul is Pull.UP:
 137                 self._pin.init(mode=Pin.IN, pull=Pin.PULL_UP)
 138             elif pul is Pull.DOWN:
 139                 if hasattr(Pin, "PULL_DOWN"):
 140                     self._pin.init(mode=Pin.IN, pull=Pin.PULL_DOWN)
 141                 else:
 142                     raise NotImplementedError("{} unsupported on {}".format(
 143                         Pull.DOWN, board_id))
 144             elif pul is None:
 145                 self._pin.init(mode=Pin.IN, pull=None)
 146             else:
 147                 raise AttributeError("Not a Pull")
 148         else:
 149             raise AttributeError("Not an input")
 150
 151     @property
 152     def drive_mode(self):
 153         if self.direction is Direction.OUTPUT:
 154             return self.__drive_mode  #
 155         else:
 156             raise AttributeError("Not an output")
 157
 158     @drive_mode.setter
 159     def drive_mode(self, mod):
 160         self.__drive_mode = mod
 161         if mod is DriveMode.OPEN_DRAIN:
 162             self._pin.init(mode=Pin.OPEN_DRAIN)
 163         elif mod is DriveMode.PUSH_PULL:
 164             self._pin.init(mode=Pin.OUT)