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