M5stack | Micropython API

  • Hi,
    Where can I find the source code of the following:
    m5stack, m5stack_ui, uiflow..
    If it's not possible then where can I find a documentation for the functions they contain??
    For example: https://docs.m5stack.com/en/mpy/display/m5stack_lvgl
    In the above link they describe Micropython LVGL, but they don't give any information about the API.. How can I write code if I don't know anything about what I have in hand??
    I'd appreciate any help.

    Thanks in advance!