ucosii 的信号量问题

只看该作者 · 2011-8-11 11:45

本帖最后由 wolf1116 于 2011-8-11 11:46 编辑

在 ucosii 的串口中断发送信号量 OSSemPost 任务接收不到，单步跟踪下，关中断处出现异常

INT8U  OSSemPost (OS_EVENT *pevent)
{
#if OS_CRITICAL_METHOD == 3                               /* Allocate storage for CPU status register */
OS_CPU_SR  cpu_sr;
#endif

#if OS_ARG_CHK_EN > 0
if (pevent == (OS_EVENT *)0) {                      /* Validate 'pevent'                      */
      return (OS_ERR_PEVENT_NULL);
}
if (pevent->OSEventType != OS_EVENT_TYPE_SEM) {       /* Validate event block type             */
      return (OS_ERR_EVENT_TYPE);
}
#endif
OS_ENTER_CRITICAL();
if (pevent->OSEventGrp != 0x00) {                   /* See if any task waiting for semaphore */
      OS_EventTaskRdy(pevent, (void *)0, OS_STAT_SEM); /* Ready highest prio task waiting on event */
      OS_EXIT_CRITICAL();
      OS_Sched();                                     /* Find highest priority task ready to run  */
      return (OS_NO_ERR);
}
if (pevent->OSEventCnt < 65535) {                /* Make sure semaphore will not overflow       */
      pevent->OSEventCnt++;                      /* Increment semaphore count to register event */
      OS_EXIT_CRITICAL();
      return (OS_NO_ERR);
}
OS_EXIT_CRITICAL();                            /* Semaphore value has reached its maximum    */
return (OS_SEM_OVF);

出现异常 HARD_FAULT_HANDLE
请高手指点~
}