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.S905X3:
  31     from adafruit_blinka.microcontroller.amlogic.s905x3.pin import Pin
  32 elif detector.chip.S922X:
  33     from adafruit_blinka.microcontroller.amlogic.s922x.pin import Pin
  34 elif detector.chip.EXYNOS5422:
  35     from adafruit_blinka.microcontroller.samsung.exynos5422.pin import Pin
  36 elif detector.chip.APQ8016:
  37     from adafruit_blinka.microcontroller.snapdragon.apq8016.pin import Pin
  38 elif detector.chip.IMX8MX:
  39     from adafruit_blinka.microcontroller.nxp_imx8m.pin import Pin
  40 elif detector.chip.HFU540:
  41     from adafruit_blinka.microcontroller.hfu540.pin import Pin
  42 elif detector.chip.A64:
  43     from adafruit_blinka.microcontroller.allwinner.a64.pin import Pin
  44 elif detector.chip.A33:
  45     from adafruit_blinka.microcontroller.allwinner.a33.pin import Pin
  46 elif detector.chip.MIPS24KEC:
  47     from adafruit_blinka.microcontroller.mips24kec.pin import Pin
  48 elif detector.chip.RK3308:
  49     from adafruit_blinka.microcontroller.rockchip.rk3308.pin import Pin
  50 elif detector.board.ftdi_ft232h:
  51     from adafruit_blinka.microcontroller.ft232h.pin import Pin
  52 elif detector.board.binho_nova:
  53     from adafruit_blinka.microcontroller.nova.pin import Pin
  54 elif detector.board.greatfet_one:
  55     from adafruit_blinka.microcontroller.nxp_lpc4330.pin import Pin
  56 elif detector.chip.STM32:
  57     from machine import Pin
  58 elif detector.board.microchip_mcp2221:
  59     from adafruit_blinka.microcontroller.mcp2221.pin import Pin
  60 from adafruit_blinka import Enum, ContextManaged
  61
  62
  63 class DriveMode(Enum):
  64     PUSH_PULL = None
  65     OPEN_DRAIN = None
  66
  67
  68 DriveMode.PUSH_PULL = DriveMode()
  69 DriveMode.OPEN_DRAIN = DriveMode()
  70
  71
  72 class Direction(Enum):
  73     INPUT = None
  74     OUTPUT = None
  75
  76
  77 Direction.INPUT = Direction()
  78 Direction.OUTPUT = Direction()
  79
  80
  81 class Pull(Enum):
  82     UP = None
  83     DOWN = None
  84     # NONE=None
  85
  86
  87 Pull.UP = Pull()
  88 Pull.DOWN = Pull()
  89
  90 # Pull.NONE = Pull()
  91
  92
  93 class DigitalInOut(ContextManaged):
  94     _pin = None
  95
  96     def __init__(self, pin):
  97         self._pin = Pin(pin.id)
  98         self.direction = Direction.INPUT
  99
 100     def switch_to_output(self, value=False, drive_mode=DriveMode.PUSH_PULL):
 101         self.direction = Direction.OUTPUT
 102         self.value = value
 103         self.drive_mode = drive_mode
 104
 105     def switch_to_input(self, pull=None):
 106         self.direction = Direction.INPUT
 107         self.pull = pull
 108
 109     def deinit(self):
 110         del self._pin
 111
 112     @property
 113     def direction(self):
 114         return self.__direction
 115
 116     @direction.setter
 117     def direction(self, dir):
 118         self.__direction = dir
 119         if dir is Direction.OUTPUT:
 120             self._pin.init(mode=Pin.OUT)
 121             self.value = False
 122             self.drive_mode = DriveMode.PUSH_PULL
 123         elif dir is Direction.INPUT:
 124             self._pin.init(mode=Pin.IN)
 125             self.pull = None
 126         else:
 127             raise AttributeError("Not a Direction")
 128
 129     @property
 130     def value(self):
 131         return self._pin.value() == 1
 132
 133     @value.setter
 134     def value(self, val):
 135         if self.direction is Direction.OUTPUT:
 136             self._pin.value(1 if val else 0)
 137         else:
 138             raise AttributeError("Not an output")
 139
 140     @property
 141     def pull(self):
 142         if self.direction is Direction.INPUT:
 143             return self.__pull
 144         else:
 145             raise AttributeError("Not an input")
 146
 147     @pull.setter
 148     def pull(self, pul):
 149         if self.direction is Direction.INPUT:
 150             self.__pull = pul
 151             if pul is Pull.UP:
 152                 self._pin.init(mode=Pin.IN, pull=Pin.PULL_UP)
 153             elif pul is Pull.DOWN:
 154                 if hasattr(Pin, "PULL_DOWN"):
 155                     self._pin.init(mode=Pin.IN, pull=Pin.PULL_DOWN)
 156                 else:
 157                     raise NotImplementedError(
 158                         "{} unsupported on {}".format(Pull.DOWN, board_id)
 159                     )
 160             elif pul is None:
 161                 self._pin.init(mode=Pin.IN, pull=None)
 162             else:
 163                 raise AttributeError("Not a Pull")
 164         else:
 165             raise AttributeError("Not an input")
 166
 167     @property
 168     def drive_mode(self):
 169         if self.direction is Direction.OUTPUT:
 170             return self.__drive_mode  #
 171         else:
 172             raise AttributeError("Not an output")
 173
 174     @drive_mode.setter
 175     def drive_mode(self, mod):
 176         self.__drive_mode = mod
 177         if mod is DriveMode.OPEN_DRAIN:
 178             self._pin.init(mode=Pin.OPEN_DRAIN)
 179         elif mod is DriveMode.PUSH_PULL:
 180             self._pin.init(mode=Pin.OUT)