# SPDX-FileCopyrightText: Copyright (c) 2022 ladyada for Adafruit Industries
#
# SPDX-License-Identifier: Unlicense

import time

import board

from adafruit_tca8418 import TCA8418

i2c = board.I2C()  # uses board.SCL and board.SDA
# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
tca = TCA8418(i2c)

# set up all R0-R4 pins and C0-C3 pins as keypads
KEYPADPINS = (
    TCA8418.R0,
    TCA8418.R1,
    TCA8418.R2,
    TCA8418.R3,
    TCA8418.C0,
    TCA8418.C1,
    TCA8418.C2,
    TCA8418.C3,
)

# make them inputs with pullups
for pin in KEYPADPINS:
    tca.keypad_mode[pin] = True
    # make sure the key pins generate FIFO events
    tca.enable_int[pin] = True
    # we will stick events into the FIFO queue
    tca.event_mode_fifo[pin] = True

# turn on INT output pin
tca.key_intenable = True

while True:
    if tca.key_int:
        # first figure out how big the queue is
        events = tca.events_count
        # now print each event in the queue
        for _ in range(events):
            keyevent = tca.next_event
            print(f"\tKey event: {keyevent:#04X} - key #{keyevent & 0x7F} ", end="")
            if keyevent & 0x80:
                print("key down")
            else:
                print("key up")
        tca.key_int = True  # clear the IRQ by writing 1 to it
        time.sleep(0.01)