求救贴：UCOSII系统的消息队列，程序进入异常

只看该作者 · 2013-2-22 13:23

本帖最后由 e08610318 于 2013-2-22 14:03 编辑

ARM-CortexM3处理器，使用广州致远的ucosii移植代码。设计使用消息队列来调度任务，结果，当中断向某个任务传递消息(指针)时，程序在
红色部分函数内执行OS_EXIT_CRITICAL()语句后进入异常
void __sysTickIsr (void)
{
STCTRL;

OSIntEnter();
OSTimeTick();                                                    /*  系统节拍处理             */
OSIntExit();
}

还有一种情况，我自己测试的

在一个任务内向本任务传递一条消息，即OSQPost()后立马执行OSQPend()，在OSQPend()语句内的红色部分语句执行后立马进入异常。

void  *OSQPend (OS_EVENT *pevent, INT16U timeout, INT8U *err)
{
#if OS_CRITICAL_METHOD == 3                   /* Allocate storage for CPU status register          */
OS_CPU_SR  cpu_sr;
#endif
void    *msg;
OS_Q    *pq;

if (OSIntNesting > 0) {                   /* See if called from ISR ...                      */
      *err = OS_ERR_PEND_ISR;                /* ... can't PEND from an ISR                      */
      return ((void *)0);
}
#if OS_ARG_CHK_EN > 0
if (pevent == (OS_EVENT *)0) {             /* Validate 'pevent'                               */
      *err = OS_ERR_PEVENT_NULL;
      return ((void *)0);
}
if (pevent->OSEventType != OS_EVENT_TYPE_Q) {/* Validate event block type                         */
      *err = OS_ERR_EVENT_TYPE;
      return ((void *)0);
}
#endif
OS_ENTER_CRITICAL();
pq = (OS_Q *)pevent->OSEventPtr;          /* Point at queue control block                      */
if (pq->OSQEntries > 0) {                   /* See if any messages in the queue                */
      msg = *pq->OSQOut++;                   /* Yes, extract oldest message from the queue       */
      pq->OSQEntries--;                      /* Update the number of entries in the queue       */
      if (pq->OSQOut == pq->OSQEnd) {       /* Wrap OUT pointer if we are at the end of the queue */
         pq->OSQOut = pq->OSQStart;
      }
      OS_EXIT_CRITICAL();
      *err = OS_NO_ERR;
   return (msg);                         /* Return message received                         */
}
OSTCBCur->OSTCBStat |= OS_STAT_Q;          /* Task will have to pend for a message to be posted  */
OSTCBCur->OSTCBDly = timeout;             /* Load timeout into TCB                            */
OS_EventTaskWait(pevent);                   /* Suspend task until event or timeout occurs       */
OS_EXIT_CRITICAL();
OS_Sched();                               /* Find next highest priority task ready to run    */
OS_ENTER_CRITICAL();
msg = OSTCBCur->OSTCBMsg;
if (msg != (void *)0) {                   /* Did we get a message?                            */
      OSTCBCur->OSTCBMsg    = (void *)0;    /* Extract message from TCB (Put there by QPost)    */
      OSTCBCur->OSTCBStat    = OS_STAT_RDY;
      OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0; /* No longer waiting for event                      */
      OS_EXIT_CRITICAL();
      *err                   = OS_NO_ERR;
      return (msg);                         /* Return message received                         */
}
OS_EventTO(pevent);                         /* Timed out                                        */
OS_EXIT_CRITICAL();
*err = OS_TIMEOUT;                         /* Indicate a timeout occured                      */
return ((void *)0);                         /* No message received                               */
}

最终程序死在异常中(红色部分):
void defaultVectorHandle3 (void)
{
#ifdef DEBUG
      while (1);
#else
zyReset(ZY_HARD_RESET);
#endif                                                                /*  DEBUG                      */
}

我暂时找不到原因啊，自己对ARM还没有很深的了解，希望前辈能够给我点提示。