Example using interrupts

[haexperts2020]

I am trying to add an interrupt to pin 0 on the chip and then on my pi pin 16 listens for the interrupt from one of the interrupt pins on the chip. I think I am close. Right now I can see the button presses but no interrupts fire.

from mcp230xx import MCP230XX

import time, os
import RPi.GPIO as IO

IO.setmode(IO.BCM)
IO.setup(21, IO.IN, pull_up_down=IO.PUD_UP)

MCP = MCP230XX('MCP23017', 0x27, '16bit')
MCP.set_mode(0, 'input', 'enable')

MCP.interrupt_options(outputType = 'activehigh', bankControl = 'both')
	
def functA():
	print('abc')

def functB():
	print('efg')

MCP.add_interrupt(0, callbackFunctLow=functA, callbackFunctHigh=functB) 

IO.add_event_detect(16, IO.FALLING, callback = MCP.callbackBoth)

while True:
	print(MCP.input(0))
	time.sleep(.2)