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.S905X3:
  31     from adafruit_blinka.microcontroller.amlogic.s905x3.pin import Pin
  32 elif detector.chip.S922X:
  33     from adafruit_blinka.microcontroller.amlogic.s922x.pin import Pin
  34 elif detector.chip.APQ8016:
  35     from adafruit_blinka.microcontroller.snapdragon.apq8016.pin import Pin
  36 elif detector.chip.IMX8MX:
  37     from adafruit_blinka.microcontroller.nxp_imx8m.pin import Pin
  38 elif detector.chip.HFU540:
  39     from adafruit_blinka.microcontroller.hfu540.pin import Pin
  40 elif detector.chip.A64:
  41     from adafruit_blinka.microcontroller.allwinner.a64.pin import Pin
  42 elif detector.chip.A33:
  43     from adafruit_blinka.microcontroller.allwinner.a33.pin import Pin
  44 elif detector.board.ftdi_ft232h:
  45     from adafruit_blinka.microcontroller.ft232h.pin import Pin
  46 elif detector.board.binho_nova:
  47     from adafruit_blinka.microcontroller.nova.pin import Pin
  48 elif detector.chip.STM32:
  49     from machine import Pin
  50 elif detector.board.microchip_mcp2221:
  51     from adafruit_blinka.microcontroller.mcp2221.pin import Pin
  52 from adafruit_blinka import Enum, ContextManaged
  53
  54 class DriveMode(Enum):
  55     PUSH_PULL = None
  56     OPEN_DRAIN = None
  57
  58
  59 DriveMode.PUSH_PULL = DriveMode()
  60 DriveMode.OPEN_DRAIN = DriveMode()
  61
  62
  63 class Direction(Enum):
  64     INPUT = None
  65     OUTPUT = None
  66
  67
  68 Direction.INPUT = Direction()
  69 Direction.OUTPUT = Direction()
  70
  71
  72 class Pull(Enum):
  73     UP = None
  74     DOWN = None
  75     #NONE=None
  76
  77
  78 Pull.UP = Pull()
  79 Pull.DOWN = Pull()
  80
  81 #Pull.NONE = Pull()
  82
  83
  84 class DigitalInOut(ContextManaged):
  85     _pin = None
  86
  87     def __init__(self, pin):
  88         self._pin = Pin(pin.id)
  89         self.direction = Direction.INPUT
  90
  91     def switch_to_output(self, value=False, drive_mode=DriveMode.PUSH_PULL):
  92         self.direction = Direction.OUTPUT
  93         self.value = value
  94         self.drive_mode = drive_mode
  95
  96     def switch_to_input(self, pull=None):
  97         self.direction = Direction.INPUT
  98         self.pull = pull
  99
 100     def deinit(self):
 101         del self._pin
 102
 103     @property
 104     def direction(self):
 105         return self.__direction
 106
 107     @direction.setter
 108     def direction(self, dir):
 109         self.__direction = dir
 110         if dir is Direction.OUTPUT:
 111             self._pin.init(mode=Pin.OUT)
 112             self.value = False
 113             self.drive_mode = DriveMode.PUSH_PULL
 114         elif dir is Direction.INPUT:
 115             self._pin.init(mode=Pin.IN)
 116             self.pull = None
 117         else:
 118             raise AttributeError("Not a Direction")
 119
 120     @property
 121     def value(self):
 122         return self._pin.value() is 1
 123
 124     @value.setter
 125     def value(self, val):
 126         if self.direction is Direction.OUTPUT:
 127             self._pin.value(1 if val else 0)
 128         else:
 129             raise AttributeError("Not an output")
 130
 131     @property
 132     def pull(self):
 133         if self.direction is Direction.INPUT:
 134             return self.__pull
 135         else:
 136             raise AttributeError("Not an input")
 137
 138     @pull.setter
 139     def pull(self, pul):
 140         if self.direction is Direction.INPUT:
 141             self.__pull = pul
 142             if pul is Pull.UP:
 143                 self._pin.init(mode=Pin.IN, pull=Pin.PULL_UP)
 144             elif pul is Pull.DOWN:
 145                 if hasattr(Pin, "PULL_DOWN"):
 146                     self._pin.init(mode=Pin.IN, pull=Pin.PULL_DOWN)
 147                 else:
 148                     raise NotImplementedError("{} unsupported on {}".format(
 149                         Pull.DOWN, board_id))
 150             elif pul is None:
 151                 self._pin.init(mode=Pin.IN, pull=None)
 152             else:
 153                 raise AttributeError("Not a Pull")
 154         else:
 155             raise AttributeError("Not an input")
 156
 157     @property
 158     def drive_mode(self):
 159         if self.direction is Direction.OUTPUT:
 160             return self.__drive_mode  #
 161         else:
 162             raise AttributeError("Not an output")
 163
 164     @drive_mode.setter
 165     def drive_mode(self, mod):
 166         self.__drive_mode = mod
 167         if mod is DriveMode.OPEN_DRAIN:
 168             self._pin.init(mode=Pin.OPEN_DRAIN)
 169         elif mod is DriveMode.PUSH_PULL:
 170             self._pin.init(mode=Pin.OUT)