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from supervisor import ticks_ms
# See the example at
# https://docs.circuitpython.org/en/latest/shared-bindings/supervisor/index.html?#supervisor.ticks_ms
_TICKS_PERIOD = const(1<<29)
_TICKS_MAX = const(_TICKS_PERIOD-1)
_TICKS_HALFPERIOD = const(_TICKS_PERIOD//2)
def add(ticks, delta):
"Add a delta to a base number of ticks, performing wraparound at 2**29ms."
return (ticks + delta) % _TICKS_PERIOD
def diff(ticks1, ticks2):
"Compute the signed difference between two ticks values, assuming that they are within 2**28 ticks"
diff = (ticks1 - ticks2) & _TICKS_MAX
diff = ((diff + _TICKS_HALFPERIOD) & _TICKS_MAX) - _TICKS_HALFPERIOD
return diff
def less(ticks):
"Return true iff ticks1 is less than ticks2, assuming that they are within 2**28 ticks"
return diff(ticks_ms(), ticks) < 0
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