Damien George 9e1b25a99e docs/library/machine: Specify initial machine.PWM class. ...

This adds an initial specification of the machine.PWM class, to provide a
way to generate PWM output that is portable across the different ports.
Such functionality may already be available in one way or another (eg
through a Timer object), but because configuring PWM via a Timer is very
port-specific, and because it's a common thing to do, it's beneficial to
have a top-level construct for it.

The specification in this commit aims to provide core functionality in a
minimal way.  It also somewhat matches most existing ad-hoc implementations
of machine.PWM.

See discussion in #2283 and #4237.

Signed-off-by: Damien George <damien@micropython.org>

2021-04-30 16:42:51 +10:00

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