2d437b0f68
The code to recalculate the uptime to walltime adjustment was broken
(e.g. the longer we leave it after reboot the more inaccurate the time
setting becomes).
Fixes: 80079e4 ("wasp: nrf_rtc: Add a tiny bit of extra resolution")
71 lines
1.7 KiB
Python
71 lines
1.7 KiB
Python
# SPDX-License-Identifier: LGPL-3.0-or-later
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# Copyright (C) 2020 Daniel Thompson
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""" Real Time Clock based on the nRF-family low power counter """
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import time
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#class Stim(object):
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# def __init__(self):
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# self(0)
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#
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# def __call__(self, v):
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# self.c = v
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#
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# def counter(self):
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# return self.c
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class RTC(object):
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"""Real Time Clock based on the nRF-family low power counter."""
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def __init__(self, counter):
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self.counter = counter
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self._uptime = 0
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self.set_localtime((2020, 3, 1, 3, 0, 0, 0, 0))
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def update(self):
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newcount = self.counter.counter()
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split = newcount - self.lastcount
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if split == 0:
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return False
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if split < 0:
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split += (1 << 24)
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self.lastcount += split
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self.lastcount &= (1 << 24) - 1
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self._uptime += split
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return True
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def set_localtime(self, t):
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self.lastcount = self.counter.counter()
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if len(t) < 8:
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yyyy = t[0]
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mm = t[1]
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dd = t[2]
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HH = t[3]
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MM = t[4]
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SS = t[5]
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t = (yyyy, mm, dd, HH, MM, SS, 0, 0)
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lt = time.mktime(t)
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self.offset = lt - (self._uptime >> 3)
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def get_localtime(self):
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self.update()
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return time.localtime(self.offset + (self._uptime >> 3))
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def get_time(self):
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localtime = self.get_localtime()
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return localtime[3:6]
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@property
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def uptime(self):
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"""Provide the current uptime in seconds."""
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return self._uptime // 8
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def get_uptime_ms(self):
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"""Return the current uptime in milliseconds."""
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return self._uptime * 125
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