RTOS事件列表初始化解析-优快云博客

本文详细解析了RTOS中事件列表初始化函数OS_InitEventList的具体实现，包括对全局变量OSEventTbl和OSEventFreeList的操作过程，适用于关注RTOS最小系统的开发者。

static void OS_InitEventList (void)
{
#if (OS_EVENT_EN) && (OS_MAX_EVENTS > 0)
#if (OS_MAX_EVENTS > 1)
INT16U i;
OS_EVENT *pevent1;
OS_EVENT *pevent2;
OS_MemClr((INT8U *)&OSEventTbl[0], sizeof(OSEventTbl)); /* Clear the event table */
pevent1 = &OSEventTbl[0];
pevent2 = &OSEventTbl[1];
for (i = 0; i < (OS_MAX_EVENTS - 1); i++) { /* Init. list of free EVENT control blocks */
pevent1->OSEventType = OS_EVENT_TYPE_UNUSED;
pevent1->OSEventPtr = pevent2;
#if OS_EVENT_NAME_SIZE > 1
pevent1->OSEventName[0] = '?'; /* Unknown name */
pevent1->OSEventName[1] = OS_ASCII_NUL;
#endif
pevent1++;
pevent2++;
}
pevent1->OSEventType = OS_EVENT_TYPE_UNUSED;
pevent1->OSEventPtr = (OS_EVENT *)0;
#if OS_EVENT_NAME_SIZE > 1
pevent1->OSEventName[0] = '?';
pevent1->OSEventName[1] = OS_ASCII_NUL;
#endif
OSEventFreeList = &OSEventTbl[0];
#else
OSEventFreeList = &OSEventTbl[0]; /* Only have ONE event control block */
OSEventFreeList->OSEventType = OS_EVENT_TYPE_UNUSED;
OSEventFreeList->OSEventPtr = (OS_EVENT *)0;
#if OS_EVENT_NAME_SIZE > 1
OSEventFreeList->OSEventName[0] = '?'; /* Unknown name */
OSEventFreeList->OSEventName[1] = OS_ASCII_NUL;
#endif
#endif
#endif

}

这个函数实际上是对

OSEventTbl[0]

OSEventFreeList

这两个全局变量进行操作，类似于TCB

这里只关注最小系统，所以不对后面的函数进行解释