I am sorry, I cannot help you on this one - I don't have the EXTEND I/O unit to test.

That said, you might get some idea how to talk to it through I2C by looking at the Arduino example?

Thanks
Felix

The PaHUB solution on internal I2C 21/22 does not seem to be the right solution.
I only have to use two EXTEND I/O with two different addresses, but Uiflow only recognizes address 0x27.
Do you have an example of using EXTEND I/O with the I2C master functions of Uiflow without going through the declaration of an EXTEND I/O unit.
I only need the 8 I / O input and to read their status

an example of use would be very useful

I don't think this kind of setup will work with the current UiFlow version. I tried many things to trick the PbHub being recognized on a PaHub connected to 21/22.

That said, the trouble actually starts before that. Even with only a PaHub connected and setup to use 21/22 below code either crashes my M5Core2 after a short time or it shows an I2C bus error (110). I think the UiFlow firmware and the micropython code both trying to use the I2C bus at the same time is causing this.

from m5stack import *
from m5stack_ui import *
from uiflow import *
import unit

screen = M5Screen()
screen.clean_screen()
screen.set_screen_bg_color(0xFFFFFF)
pahub_0 = unit.get(unit.PAHUB, (21,22))

while True:
  pahub_0.select(0, 1)
  wait_ms(2)

Thanks
Felix