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.chip.HFU540:
  37     from adafruit_blinka.microcontroller.hfu540.pin import Pin
  38 elif detector.chip.A64:
  39     from adafruit_blinka.microcontroller.allwinner.a64.pin import Pin
  40 elif detector.board.ftdi_ft232h:
  41     from adafruit_blinka.microcontroller.ft232h.pin import Pin
  42 elif detector.board.binho_nova:
  43     from adafruit_blinka.microcontroller.nova.pin import Pin
  44 elif detector.chip.STM32:
  45     from machine import Pin
  46 elif detector.board.microchip_mcp2221:
  47     from adafruit_blinka.microcontroller.mcp2221.pin import Pin
  48 from adafruit_blinka import Enum, ContextManaged
  49
  50 class DriveMode(Enum):
  51     PUSH_PULL = None
  52     OPEN_DRAIN = None
  53
  54
  55 DriveMode.PUSH_PULL = DriveMode()
  56 DriveMode.OPEN_DRAIN = DriveMode()
  57
  58
  59 class Direction(Enum):
  60     INPUT = None
  61     OUTPUT = None
  62
  63
  64 Direction.INPUT = Direction()
  65 Direction.OUTPUT = Direction()
  66
  67
  68 class Pull(Enum):
  69     UP = None
  70     DOWN = None
  71     #NONE=None
  72
  73
  74 Pull.UP = Pull()
  75 Pull.DOWN = Pull()
  76
  77 #Pull.NONE = Pull()
  78
  79
  80 class DigitalInOut(ContextManaged):
  81     _pin = None
  82
  83     def __init__(self, pin):
  84         self._pin = Pin(pin.id)
  85         self.direction = Direction.INPUT
  86
  87     def switch_to_output(self, value=False, drive_mode=DriveMode.PUSH_PULL):
  88         self.direction = Direction.OUTPUT
  89         self.value = value
  90         self.drive_mode = drive_mode
  91
  92     def switch_to_input(self, pull=None):
  93         self.direction = Direction.INPUT
  94         self.pull = pull
  95
  96     def deinit(self):
  97         del self._pin
  98
  99     @property
 100     def direction(self):
 101         return self.__direction
 102
 103     @direction.setter
 104     def direction(self, dir):
 105         self.__direction = dir
 106         if dir is Direction.OUTPUT:
 107             self._pin.init(mode=Pin.OUT)
 108             self.value = False
 109             self.drive_mode = DriveMode.PUSH_PULL
 110         elif dir is Direction.INPUT:
 111             self._pin.init(mode=Pin.IN)
 112             self.pull = None
 113         else:
 114             raise AttributeError("Not a Direction")
 115
 116     @property
 117     def value(self):
 118         return self._pin.value() is 1
 119
 120     @value.setter
 121     def value(self, val):
 122         if self.direction is Direction.OUTPUT:
 123             self._pin.value(1 if val else 0)
 124         else:
 125             raise AttributeError("Not an output")
 126
 127     @property
 128     def pull(self):
 129         if self.direction is Direction.INPUT:
 130             return self.__pull
 131         else:
 132             raise AttributeError("Not an input")
 133
 134     @pull.setter
 135     def pull(self, pul):
 136         if self.direction is Direction.INPUT:
 137             self.__pull = pul
 138             if pul is Pull.UP:
 139                 self._pin.init(mode=Pin.IN, pull=Pin.PULL_UP)
 140             elif pul is Pull.DOWN:
 141                 if hasattr(Pin, "PULL_DOWN"):
 142                     self._pin.init(mode=Pin.IN, pull=Pin.PULL_DOWN)
 143                 else:
 144                     raise NotImplementedError("{} unsupported on {}".format(
 145                         Pull.DOWN, board_id))
 146             elif pul is None:
 147                 self._pin.init(mode=Pin.IN, pull=None)
 148             else:
 149                 raise AttributeError("Not a Pull")
 150         else:
 151             raise AttributeError("Not an input")
 152
 153     @property
 154     def drive_mode(self):
 155         if self.direction is Direction.OUTPUT:
 156             return self.__drive_mode  #
 157         else:
 158             raise AttributeError("Not an output")
 159
 160     @drive_mode.setter
 161     def drive_mode(self, mod):
 162         self.__drive_mode = mod
 163         if mod is DriveMode.OPEN_DRAIN:
 164             self._pin.init(mode=Pin.OPEN_DRAIN)
 165         elif mod is DriveMode.PUSH_PULL:
 166             self._pin.init(mode=Pin.OUT)