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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.
OS_ERR_OBJ_PTR_NULL
if OS_CFG_ARG_CHK_EN is set to 1 in os_cfg.h: if the caller passed a NULL pointer.
OS_ERR_OBJ_TYPE
if OS_CFG_OBJ_TYPE_CHK_EN is set to 1 in os_cfg.h: p_grp is not pointing to an event flag group.
Returned Value
The new value of the event flags.
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