src/adafruit_blinka/microcontroller/nova/__init__.py

   1 # SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
   2 #
   3 # SPDX-License-Identifier: MIT
   4 """Generic Connection class for Binho Nova to keep track of connection"""
   5
   6
   7 class Connection:
   8     """Connection class"""
   9
  10     __instance = None
  11
  12     @staticmethod
  13     def getInstance():
  14         """Static access method."""
  15         if Connection.__instance is None:
  16             Connection()
  17         return Connection.__instance
  18
  19     def __init__(self):
  20         """Virtually private constructor."""
  21         if Connection.__instance is not None:
  22             raise Exception(  # pylint: disable=broad-exception-raised
  23                 "This class is a singleton!"
  24             )
  25
  26         # pylint: disable=import-outside-toplevel
  27         from binhoHostAdapter import binhoHostAdapter
  28         from binhoHostAdapter import binhoUtilities
  29
  30         # pylint: enable=import-outside-toplevel
  31         devices = binhoUtilities.listAvailableDevices()
  32
  33         if len(devices) > 0:
  34             Connection.__instance = binhoHostAdapter.binhoHostAdapter(devices[0])
  35         else:
  36             raise RuntimeError("No Binho Nova found!")