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to block the caller until the semaphore is available or a timeout occurs.
OS_OPT_PEND_NON_BLOCKING
if If the semaphore is not available, OSSemPend() will not block but return to the caller with an appropriate error code.
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is a pointer to a variable used to hold an error code:
OS_ERR_NONE
if If the semaphore is available.
OS_ERR_OBJ_DEL
if If the semaphore was deleted.
OS_ERR_OBJ_PTR_NULL
if If OS_CFG_ARG_CHK_EN is set to 1 in os_cfg.h: if p_sem is a NULL pointer.
OS_ERR_OBJ_TYPE
if If OS_CFG_OBJ_TYPE_CHK_EN is set to 1 in os_cfg.h: if p_sem is not pointing to a semaphore.
OS_ERR_OPT_INVALID
if If OS_CFG_ARG_CHK_EN is set to 1 in os_cfg.h: if opt is not OS_OPT_PEND_NON_BLOCKING or OS_OPT_PEND_BLOCKING.
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if the pend was aborted
OS_ERR_PEND_ISR
if If OS_CFG_CALLED_FROM_ISR_CHK_EN set to 1 in os_cfg.h: if this function is called from an ISR.
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if this function is called as specified OS_OPT_PEND_NON_BLOCKING, and the semaphore was not available.
OS_ERR_SCHED_LOCKED
if If calling this function when the scheduler is locked.
OS_ERR_TIMEOUT
if If the semaphore is not signaled within the specified timeout.
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