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