kopia lustrzana https://github.com/micropython/micropython-lib
69 wiersze
2.2 KiB
Python
69 wiersze
2.2 KiB
Python
from time import gmtime
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import socket
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import struct
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# The NTP host can be configured at runtime by doing: ntptime.host = 'myhost.org'
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host = "pool.ntp.org"
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# The NTP socket timeout can be configured at runtime by doing: ntptime.timeout = 2
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timeout = 1
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def time():
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NTP_QUERY = bytearray(48)
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NTP_QUERY[0] = 0x1B
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addr = socket.getaddrinfo(host, 123)[0][-1]
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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s.settimeout(timeout)
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s.sendto(NTP_QUERY, addr)
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msg = s.recv(48)
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finally:
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s.close()
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val = struct.unpack("!I", msg[40:44])[0]
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# 2024-01-01 00:00:00 converted to an NTP timestamp
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MIN_NTP_TIMESTAMP = 3913056000
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# Y2036 fix
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#
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# The NTP timestamp has a 32-bit count of seconds, which will wrap back
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# to zero on 7 Feb 2036 at 06:28:16.
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#
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# We know that this software was written during 2024 (or later).
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# So we know that timestamps less than MIN_NTP_TIMESTAMP are impossible.
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# So if the timestamp is less than MIN_NTP_TIMESTAMP, that probably means
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# that the NTP time wrapped at 2^32 seconds. (Or someone set the wrong
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# time on their NTP server, but we can't really do anything about that).
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#
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# So in that case, we need to add in those extra 2^32 seconds, to get the
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# correct timestamp.
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#
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# This means that this code will work until the year 2160. More precisely,
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# this code will not work after 7th Feb 2160 at 06:28:15.
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#
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if val < MIN_NTP_TIMESTAMP:
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val += 0x100000000
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# Convert timestamp from NTP format to our internal format
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EPOCH_YEAR = gmtime(0)[0]
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if EPOCH_YEAR == 2000:
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# (date(2000, 1, 1) - date(1900, 1, 1)).days * 24*60*60
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NTP_DELTA = 3155673600
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elif EPOCH_YEAR == 1970:
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# (date(1970, 1, 1) - date(1900, 1, 1)).days * 24*60*60
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NTP_DELTA = 2208988800
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else:
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raise Exception("Unsupported epoch: {}".format(EPOCH_YEAR))
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return val - NTP_DELTA
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# There's currently no timezone support in MicroPython, and the RTC is set in UTC time.
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def settime():
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t = time()
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import machine
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tm = gmtime(t)
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machine.RTC().datetime((tm[0], tm[1], tm[2], tm[6] + 1, tm[3], tm[4], tm[5], 0))
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