pcf8563_simpletest.py

# SPDX-FileCopyrightText: 2019 Sommersoft
# SPDX-FileCopyrightText: Copyright (c) 2021 Jeff Epler for Adafruit Industries
#
# SPDX-License-Identifier: Unlicense

# Simple demo of reading and writing the time for the PCF8563 real-time clock.
# Change the if False to if True below to set the time, otherwise it will just
# print the current date and time every second.  Notice also comments to adjust
# for working with hardware vs. software I2C.

import time
import board
import busio

from adafruit_pcf8563.pcf8563 import PCF8563

# Change to the appropriate I2C clock & data pins here!
i2c_bus = busio.I2C(board.SCL, board.SDA)

# Create the RTC instance:
rtc = PCF8563(i2c_bus)

# Lookup table for names of days (nicer printing).
days = ("Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday")


# pylint: disable-msg=using-constant-test
if False:  # change to True if you want to set the time!
    #                     year, mon, date, hour, min, sec, wday, yday, isdst
    t = time.struct_time((2017, 10, 29, 10, 31, 0, 0, -1, -1))
    # you must set year, mon, date, hour, min, sec and weekday
    # yearday is not supported, isdst can be set but we don't do anything with it at this time
    print("Setting time to:", t)  # uncomment for debugging
    rtc.datetime = t
    print()
# pylint: enable-msg=using-constant-test


# Main loop:
while True:
    if rtc.datetime_compromised:
        print("RTC unset")
    else:
        print("RTC reports time is valid")
    t = rtc.datetime
    # print(t)     # uncomment for debugging
    print(
        "The date is {} {}/{}/{}".format(
            days[int(t.tm_wday)], t.tm_mday, t.tm_mon, t.tm_year
        )
    )
    print("The time is {}:{:02}:{:02}".format(t.tm_hour, t.tm_min, t.tm_sec))
    time.sleep(1)  # wait a second