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Merge pull request adafruit#9929 from pdw-mb/safe-mode-wait-docs
Document safe mode wait in README
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README.rst

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@@ -136,6 +136,9 @@ Behavior
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- Adds a safe mode that does not run user code after a hard crash or brown out. This makes it
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possible to fix code that causes nasty crashes by making it available through mass storage after
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the crash. A reset (the button) is needed after it's fixed to get back into normal mode.
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- A 1 second delay is added to the boot process during which time the status LED will flash, and
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resetting the device or pressing the boot button will force the device into safe mode. This delay
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can be removed by a compile time option (``CIRCUITPY_SKIP_SAFE_MODE_WAIT``).
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- Safe mode may be handled programmatically by providing a ``safemode.py``.
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``safemode.py`` is run if the board has reset due to entering safe mode, unless the safe mode
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initiated by the user by pressing button(s).

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