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