import os, sys, io
import M5
from M5 import *
from unit import KeyUnit
from usb.device.keyboard import Keyboard 
from usb.device.hid import KeyCode



keyboard = None
key_0 = None


def key_0_wasClicked_event(state):
  global keyboard, key_0
  keyboard.set_keys(KeyCode.A, 0, 0, 0, 0, 0)


def setup():
  global keyboard, key_0

  M5.begin()
  keyboard = Keyboard()
  key_0 = KeyUnit((1, 2))
  key_0.setCallback(type=key_0.CB_TYPE.WAS_CLICKED, cb=key_0_wasClicked_event)


def loop():
  global keyboard, key_0
  M5.update()
  key_0.tick(None)


if __name__ == '__main__':
  try:
    setup()
    while True:
      loop()
  except (Exception, KeyboardInterrupt) as e:
    try:
      from utility import print_error_msg
      print_error_msg(e)
    except ImportError:
      print("please update to latest firmware")

And I got the following error:

Traceback (most recent call last):
  File "main.py", line 5, in <module>
ImportError: no module named 'usb'

So the usb module is not present in the firmware.

• Is that on purpose, or is this a bug?
• Is there a way to add the library?