1  # The MIT License (MIT)
 2  #
 3  # Copyright (c) 2017 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  `adafruit_waveform.square`
24  ====================================================
25  
26  This library generates squard waveforms that can be used to generate
27  squard audio signals.
28  
29  * Author(s): Scott Shawcroft, BrentRu
30  """
31  
32  import array
33  
34  __version__ = "0.0.0-auto.0"
35  __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_Waveform.git"
36  
37  
38  def square_wave(sample_length=2):
39      """Generate a single square wave of sample_length size"""
40      square = array.array("H", [0] * sample_length)
41      for i in range(sample_length // 2):
42          square[i] = 0xFFFF
43      return square