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extmod/uasyncio: Add clear method to ThreadSafeFlag.

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This is useful in situations where the ThreadSafeFlag is reused and needs
to be cleared of any previous, unwanted event.

For example, clear the flag at the start of an operation, trigger the
operation (eg an I2C write), then (a)wait for an external event to set the
flag (eg a pin IRQ).  Further events may trigger the flag again but these
are unwanted and should be cleared before the next cycle starts.
This commit is contained in:
Ned Konz
2021-09-01 10:48:15 -07:00
committed by Damien George
parent cf90e24335
commit 5543b2a9cc
4 changed files with 41 additions and 2 deletions
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7
docs/library/uasyncio.rst
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@@ -153,9 +153,14 @@ class ThreadSafeFlag
.. method:: ThreadSafeFlag.set()
Set the flag. If there is a task waiting on the event, it will be scheduled
Set the flag. If there is a task waiting on the flag, it will be scheduled
to run.
.. method:: ThreadSafeFlag.clear()
Clear the flag. This may be used to ensure that a possibly previously-set
flag is clear before waiting for it.
.. method:: ThreadSafeFlag.wait()
Wait for the flag to be set. If the flag is already set then it returns