1  # The MIT License (MIT)
 2  #
 3  # Copyright (c) 2019 Scott Shawcroft for Adafruit Industries
 4  #
 5  # Permission is hereby granted, free of charge, to any person obtaining a copy
 6  # of this software and associated documentation files (the "Software"), to deal
 7  # in the Software without restriction, including without limitation the rights
 8  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9  # copies of the Software, and to permit persons to whom the Software is
10  # furnished to do so, subject to the following conditions:
11  #
12  # The above copyright notice and this permission notice shall be included in
13  # all copies or substantial portions of the Software.
14  #
15  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21  # THE SOFTWARE.
22  """
23  `float`
24  ====================================================
25  
26  This module provides float characteristics that are usable directly as attributes.
27  
28  """
29  
30  from . import Attribute
31  from . import StructCharacteristic
32  
33  __version__ = "0.0.0-auto.0"
34  __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_BLE.git"
35  
36  
37  class FloatCharacteristic(StructCharacteristic):
38      """32-bit float"""
39  
40      def __init__(
41          self,
42          *,
43          uuid=None,
44          properties=0,
45          read_perm=Attribute.OPEN,
46          write_perm=Attribute.OPEN,
47          initial_value=None
48      ):
49          if initial_value is not None:
50              initial_value = (initial_value,)
51          super().__init__(
52              "<f",
53              uuid=uuid,
54              properties=properties,
55              read_perm=read_perm,
56              write_perm=write_perm,
57              initial_value=initial_value,
58          )
59  
60      def __get__(self, obj, cls=None):
61          if obj is None:
62              return self
63          return super().__get__(obj)[0]
64  
65      def __set__(self, obj, value):
66          super().__set__(obj, (value,))