1  # SPDX-FileCopyrightText: 2018 Kattni Rembor for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  """CircuitPython Essentials PWM pin identifying script"""
 6  import board
 7  import pwmio
 8  
 9  for pin_name in dir(board):
10      pin = getattr(board, pin_name)
11      try:
12          p = pwmio.PWMOut(pin)
13          p.deinit()
14          print("PWM on:", pin_name)  # Prints the valid, PWM-capable pins!
15      except ValueError:  # This is the error returned when the pin is invalid.
16          print("No PWM on:", pin_name)  # Prints the invalid pins.
17      except RuntimeError:  # Timer conflict error.
18          print("Timers in use:", pin_name)  # Prints the timer conflict pins.
19      except TypeError:  # Error returned when checking a non-pin object in dir(board).
20          pass  # Passes over non-pin objects in dir(board).