Built-in class

The library is a user-level interface that encapsulates the underlying classes of MaixPy, making it easy for users to use MaixPy, which includes the following:

• fpioa_manager
• board_info

需要注意的是， 这些类在开机启动的时候在 _boot.py 里面已经被导入了， 所以在串口终端可以直接使用， 但是， 如果是执行文件， 则需要手动写代码导入， 否则找不到类 Be attention, theses class imported at the start up by _boot.py, so we can directly use it in serial terminal without any import, but if we execute file, we need to import by ourselves~

from board import board_info
from fpioa_manager import fm

or

from fpioa_manager import fm, board_info