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