Help needed - Cannot use asyncio on Nucelo L432KC board?

[gilmanb1]

Hello gurus :)

I have an STM32L432KC Nucleo board and have flashed it with the latest firmware found here: https://micropython.org/download/NUCLEO_L432KC/

I have been able to use mpremote to upload and run the code here: /examples/hwapi/soft_pwn.py however, when I try to use the asyncio library, I have encountered a ton of pain ;). Here's what I "know":

Using the repl: 

>>> help('modules')
__main__          errno             math              select
_asyncio          framebuf          micropython       struct
array             gc                os                sys
binascii          hashlib           platform          time
builtins          io                pyb               uctypes
collections       json              random            vfs
deflate           machine           re
Plus any modules on the filesystem

I see _asyncio above but when I try:

>>> import asyncio
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: no module named 'asyncio'

Now, I'm lost... So I've tried this:

>>> import sys
>>> print(sys.path)
['']

OK... Now I'm lost... How do I access the asyncio library?

Thanks in advance!

[sophiedegran]

Hi
Look at your help('modules')
Seem you have to import _asyncio

[scruss]

The Nucleo L432KC default image doesn't include many standard modules because it has limited flash storage. The configuration option is here: micropython/ports/stm32/boards/NUCLEO_L432KC/mpconfigboard.mk at 2e796d6c3e33e2d3b1936cd05aa926400ad1d5b7 · micropython/micropython

[scruss]

There may not be enough flash storage on the board to include all of asyncio: I couldn't see how much storage the L432KC has (256K total?).

I haven't rebuilt MicroPython in a long time, but maybe change

FROZEN_MANIFEST ?=

to

FROZEN_MANIFEST ?= $(BOARD_DIR)/manifest.py

and create a manifest.py in the boards/NUCLEO_L432KC/ folder containing one line:

include("$(PORT_DIR)/boards/manifest.py")

This will (? I hope) bring in ports/stm32/boards/manifest.py, which should enable asyncio along with dht and onewire

[gilmanb1]

Thanks so much!! Correct 256kb flash. QQ: why does it have the _asyncio then? It looks like a private module no? Shouldn’t I be able to reference that?

[mattytrentini]

The asyncio module has two parts; a small core module written in C (written for efficiency) with the rest written in Python. It seems like you have the small core C module - referenced with _asyncio - but not the Python component.

[scruss]

So can the Python components be uploaded, assuming there's enough flash storage?

[mattytrentini]

Yes, I think so 👍🏻 I haven't tried it, but if the contents of extmod/asyncio are copied somewhere on the path of the device then I can't see why it wouldn't work... (?)