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