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bsp: Optional clock driver shutdown

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Sebastian Huber 2017-08-04 14:26:36 +02:00
parent 1ab6d59863
commit bbdf66cd58
1 changed files with 8 additions and 4 deletions
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bsp-howto/clock.rst
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@ -269,12 +269,16 @@ The hardware-specific support at tick is specified by
System Shutdown Support System Shutdown Support
======================= =======================
The :dfn:`Clock Driver Shell` provides the routine ``Clock_exit()`` that is Optionally, the :dfn:`Clock Driver Shell` provides the routine ``Clock_exit()``
scheduled to be run during system shutdown via the ``atexit()`` routine. The that is scheduled to be run during system shutdown via the ``atexit()``
hardware-specific shutdown support is specified by routine. The hardware-specific shutdown support is specified by
``Clock_driver_support_shutdown_hardware()`` which is used by ``Clock_exit()``. ``Clock_driver_support_shutdown_hardware()`` which is used by ``Clock_exit()``.
It should disable the clock tick source if it was enabled. This can be used to It should disable the clock tick source if it was enabled. This can be used to
prevent clock ticks after the system is shutdown. prevent clock ticks after the system is shutdown. The
``Clock_driver_support_shutdown_hardware()`` must be provided as a macro. In
case this macro is undefined, then the shutdown support is disabled. This is
useful for example on memory constrained systems to avoid the ``atexit()``
overhead.
.. code-block:: c .. code-block:: c