busdevice_read_register_i2c_simpletest.py

import busio
import board
from adafruit_bus_device.i2c_device import I2CDevice

DEVICE_ADDRESS = 0x68 # device address of DS3231 board
A_DEVICE_REGISTER = 0x0E # device id register on the DS3231 board

# The follow is for I2C communications
comm_port = busio.I2C(board.SCL, board.SDA)
device = I2CDevice(comm_port, DEVICE_ADDRESS)

with device as bus_device:
    bus_device.write(bytes([A_DEVICE_REGISTER]))
    result = bytearray(1)
    bus_device.readinto(result)

print(''.join('{:02x}'.format(x) for x in result))