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