58 lines
1.7 KiB
Python
58 lines
1.7 KiB
Python
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
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# SPDX-License-Identifier: MIT
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# Simple script using GPS timestamps as RTC time source
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# The GPS timestamps are available without a fix and keep the track of
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# time while there is powersource (ie coin cell battery)
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import time
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import board
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import busio
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import rtc
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import adafruit_gps
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uart = busio.UART(board.TX, board.RX, baudrate=9600, timeout=10)
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# i2c = busio.I2C(board.SCL, board.SDA)
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gps = adafruit_gps.GPS(uart, debug=False)
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# gps = adafruit_gps.GPS_GtopI2C(i2c, debug=False) # Use I2C interface
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gps.send_command(b"PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0")
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gps.send_command(b"PMTK220,1000")
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print("Set GPS as time source")
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rtc.set_time_source(gps)
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the_rtc = rtc.RTC()
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def _format_datetime(datetime):
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return "{:02}/{:02}/{} {:02}:{:02}:{:02}".format(
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datetime.tm_mon,
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datetime.tm_mday,
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datetime.tm_year,
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datetime.tm_hour,
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datetime.tm_min,
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datetime.tm_sec,
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)
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last_print = time.monotonic()
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while True:
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gps.update()
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# Every second print out current time from GPS, RTC and time.localtime()
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current = time.monotonic()
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if current - last_print >= 1.0:
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last_print = current
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if not gps.timestamp_utc:
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print("No time data from GPS yet")
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continue
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# Time & date from GPS informations
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print("Fix timestamp: {}".format(_format_datetime(gps.timestamp_utc)))
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# Time & date from internal RTC
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print("RTC timestamp: {}".format(_format_datetime(the_rtc.datetime)))
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# Time & date from time.localtime() function
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local_time = time.localtime()
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print("Local time: {}".format(_format_datetime(local_time)))
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