43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
try:
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from utime import ticks_diff, ticks_add
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except ImportError:
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print("SKIP")
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raise SystemExit
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# Maximum value returned from ticks_add, ticks_ms, etc.
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TICKS_MAX = ticks_add(0, -1)
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# Maximum value returned from ticks_diff.
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TICKS_INTERVAL_MAX = TICKS_MAX // 2
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# Invariants:
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# - ticks_diff(ticks_add(T, delta), T) == delta
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# - ticks_diff(T, ticks_add(T, delta)) == -delta
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# Check actual values of ticks_add.
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print(ticks_add(20, 12))
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print(ticks_add(20, -12))
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# Check invariant.
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print(ticks_diff(ticks_add(100, 123), 100))
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print(ticks_diff(ticks_add(100, -123), 100))
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print(ticks_diff(100, ticks_add(100, 123)))
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print(ticks_diff(100, ticks_add(100, -123)))
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# Check limits.
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for T in (0, 10, TICKS_MAX):
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for delta in (
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-TICKS_INTERVAL_MAX - 1,
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-TICKS_INTERVAL_MAX,
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0,
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TICKS_INTERVAL_MAX,
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TICKS_INTERVAL_MAX + 1,
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):
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try:
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print(ticks_diff(ticks_add(T, delta), T) == delta)
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except OverflowError:
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print("OverflowError")
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try:
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print(ticks_diff(T, ticks_add(T, delta)) == -delta)
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except OverflowError:
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print("OverflowError")
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