2021-09-17 08:40:20 -07:00
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from micropython import const
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2018-10-16 22:43:47 -07:00
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2021-09-13 08:18:01 -07:00
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_TICKS_PERIOD = const(1 << 29)
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_TICKS_MAX = const(_TICKS_PERIOD - 1)
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_TICKS_HALFPERIOD = const(_TICKS_PERIOD // 2)
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2018-10-07 00:44:04 -07:00
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2018-09-28 14:35:52 -07:00
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2021-09-13 08:18:01 -07:00
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def ticks_diff(new, start):
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diff = (new - start) & _TICKS_MAX
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diff = ((diff + _TICKS_HALFPERIOD) & _TICKS_MAX) - _TICKS_HALFPERIOD
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return diff
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2018-09-28 14:35:52 -07:00
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2021-09-13 08:18:01 -07:00
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def check_deadline(new, start, ms):
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return ticks_diff(new, start) < ms
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