I'm having problems with using Pulseio with the Teensy 4.1. For example, D13 (LED) to my knowledge is a PWM capable pin, however on use it errors: Invalid pin.
Adafruit CircuitPython 6.0.0-alpha.1 on 2020-07-03; Teensy 4.1 with IMXRT1062DVJ6A
>>> import board
>>> import pulseio
>>> led = pulseio.PWMOut(board.D13)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: Invalid pin
Adafruit CircuitPython 6.0.0-alpha.1 on 2020-07-03; Teensy 4.1 with IMXRT1062DVJ6A
>>> import board
>>> import pulseio
>>> led = pulseio.PWMOut(board.D13)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: Invalid pin