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is a pointer to an error code and can be:
OS_ERR_NONE
the call is successful.
OS_ERR_FLAG_INVALID_OPT
If OS_CFG_ARG_CHK_EN is set to 1 in os_cfg.h: if you specified an invalid option.
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The new value of the event flags.
Notes/Warnings
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- Event flag groups must be created before they are used.
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- The execution time of this function depends on the number of tasks waiting on the event flag group. However, the execution time is still deterministic.
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- Although the example below shows that we are posting from a task,
OSFlagPost()can also be called from an ISR.