from FreeRTOS.h:1220
typedef struct xSTATIC_EVENT_GROUP
{
TickType_t xDummy1;
StaticList_t xDummy2;
#if( configUSE_TRACE_FACILITY == 1 )
UBaseType_t uxDummy3;
#endif
#if( ( configSUPPORT_STATIC_ALLOCATION == 1 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
uint8_t ucDummy4;
#endif
} StaticEventGroup_t;