src/adafruit_blinka/agnostic/time.py

   1 # SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
   2 #
   3 # SPDX-License-Identifier: MIT
   4 """Platform agnostic time implementation"""
   5
   6 from adafruit_blinka import agnostic
   7
   8 # We intentionally are patching into this namespace so skip the wildcard check.
   9 # pylint: disable=unused-wildcard-import,wildcard-import
  10
  11 if agnostic.implementation == "circuitpython":
  12     from time import *
  13 elif agnostic.implementation == "micropython":
  14     import utime
  15     from utime import sleep
  16
  17     from ucollections import namedtuple
  18
  19     _struct_time = namedtuple(
  20         "struct_time",
  21         (
  22             "tm_year",
  23             "tm_mon",
  24             "tm_mday",
  25             "tm_hour",
  26             "tm_min",
  27             "tm_sec",
  28             "tm_wday",
  29             "tm_yday",
  30             "tm_isdst",
  31         ),
  32     )
  33
  34     # pylint: disable=too-many-arguments
  35     def _marshal_time(
  36         tm_year,
  37         tm_mon,
  38         tm_mday,
  39         tm_hour=0,
  40         tm_min=0,
  41         tm_sec=0,
  42         tm_wday=-1,
  43         tm_yday=-1,
  44         tm_isdst=-1,
  45     ):
  46         """Construct struct_time with default values."""
  47         _struct_time(
  48             tm_year,
  49             tm_mon,
  50             tm_mday,
  51             tm_hour,
  52             tm_min,
  53             tm_sec,
  54             tm_wday,
  55             tm_yday,
  56             tm_isdst,
  57         )
  58
  59     def struct_time(time_tuple):
  60         """Create a struct_time"""
  61         return _marshal_time(*time_tuple)
  62
  63     # pylint: disable=invalid-name
  64     _total_ms = 0
  65     _prev_ticks_ms = utime.ticks_ms()
  66
  67     def monotonic():
  68         """A monotonically increasing time in seconds. No defined start time."""
  69         # Assumes that monotonic is called more frequently than the wraparound of micropython's
  70         # utime.ticks_ms()
  71         global _prev_ticks_ms, _total_ms  # pylint: disable=global-statement
  72         ticks_ms = utime.ticks_ms()
  73         _total_ms += utime.ticks_diff(ticks_ms, _prev_ticks_ms)
  74         _prev_ticks_ms = ticks_ms
  75         return _total_ms * 0.001