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is a pointer to the semaphore control block. It is assumed that storage for the semaphore will be allocated in the application. In other words, you need to declare a “global” variable as follows, and pass a pointer to this variable to OSSemCreate():
OS_SEM MySem MySem;
p_name
is a pointer to an ASCII string used to assign a name to the semaphore. The name can be displayed by debuggers or µC/Probe.
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If OS_CFG_CALLED_FROM_ISR_CHK_EN set to 1 in DEF_ENABLED in os_cfg.h: if you attempted to create a semaphore from an ISR.
OS_ERR_ILLEGAL_OBJCREATE_PTRRUN_NULLTIME
If If OS_CFGSAFETY_ARG_CHK_EN is set to 1 in os_cfg.h: if p_sem is a NULL pointer.CRITICAL_IEC61508 is defined: you called this after calling OSStart() and thus you are no longer allowed to create additional kernel objects.
OS_ERR_OBJ_PTR_TYPENULL
If OS_CFG_OBJARG_TYPE_CHK_EN is set to 1 in DEF_ENABLED in os_cfg.h: if p_sem has been initialized to a different object type.
OS_ERR_ILLEGAL_CREATE_RUN_TIME
If OS_SAFETY_CRITICAL_IEC61508 is defined: you called this after calling OSSafetyCriticalStart() and thus you are no longer allowed to create additional kernel objects.
is a NULL pointer.
Returned Value
None
Required Configuration
OS_CFG_SEM_EN must be enabled in os_cfg.h. Refer to uCµC-OS-III Configuration Manual.
Callers
Application.
Notes/Warnings
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