d5e9ab6e61
machine.time_pulse_us() is intended to provide very fine timing, including while working with signal bursts, where each transition is tracked in row. Throwing and handling an exception may take too much time and "signal loss". So instead, in case of a timeout, just return negative value. Cases of timeout while waiting for initial signal stabilization, and during actual timing, are recognized. The documentation is updated accordingly, and rewritten somewhat to clarify the function behavior.
48 lines
836 B
Python
48 lines
836 B
Python
try:
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import umachine as machine
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except ImportError:
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import machine
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try:
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machine.PinBase
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machine.time_pulse_us
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except AttributeError:
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print("SKIP")
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import sys
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sys.exit()
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class ConstPin(machine.PinBase):
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def __init__(self, value):
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self.v = value
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def value(self, v=None):
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if v is None:
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return self.v
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else:
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self.v = v
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class TogglePin(machine.PinBase):
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def __init__(self):
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self.v = 0
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def value(self, v=None):
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if v is None:
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self.v = 1 - self.v
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print("value:", self.v)
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return self.v
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p = TogglePin()
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t = machine.time_pulse_us(p, 1)
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print(type(t))
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t = machine.time_pulse_us(p, 0)
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print(type(t))
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p = ConstPin(0)
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print(machine.time_pulse_us(p, 1, 10))
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print(machine.time_pulse_us(p, 0, 10))
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