The esp32 port has the machine Counter and Encoder classes implemented in
Python, requiring a `machine.py` that extends the built-in machine module.
That previously used `__getattr__()` to delegate lookups to the built-in,
but that means any failed lookup raises an `AttributeError` instead of an
`ImportError`. This means (among other things) that certain tests like
CAN and I2CTarget would fail because they couldn't skip the test correctly.
This commit improves the situation by using `from machine import *` instead
of `__getattr__()`, which puts all the built-in functions/classes/constants
directly in the `machine.py` global namespace. That means an `ImportError`
is now correctly raised for attributes that don't exist.
Although this takes up a bit more RAM, it's now a lot faster to import from
the machine module: what used to take around 100us to lookup a name now
takes only 5us.
Signed-off-by: Damien George <damien@micropython.org>
Adds a Python override of the `machine` module, which delegates to the
built-in module and adds an implementation of `Counter` and `Encoder`,
based on the `esp32.PCNT` class.
Original implementation by: Jonathan Hogg <me@jonathanhogg.com>
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
Damien George
Jonathan Hogg