I also tried the example app at:
https://uiflow-micropython.readthedocs.io/en/develop/units/roller485.html
(see roller485_485_fire_example.m5f2 : https://uiflow2.m5stack.com/?example=https://raw.githubusercontent.com/m5stack/uiflow-micropython/develop/examples/unit/roller485/roller485_485_fire_example.m5f2)
but it errors out:
E (10676) i2c: i2c driver install error
Traceback (most recent call last):
File "<stdin>", line 67, in <module>
File "<stdin>", line 43, in setup
File "unit/roller485.py", line 127, in get_motor_mode
TypeError: 'NoneType' object isn't subscriptable
It appears that the i2c error is benign.
Your help is appreciated.
Iorex