DM648捕获视频口信号量问题

只看该作者 · 2014-7-16 09:52

创建捕获视频口通道的过程，函数调用大致为：FVID_create -> mdCreateChan -> TVP5154_open-> TVP5154_ctrl -> TVP5154_powerdown -> regSetTVP5154 ->i2c_writeReg -> PSP_i2cTransfer -> DDC_i2cTransfer

走到DDC_i2cTransfer里面的函数如下：
/* Take completion semaphore */
         if (i2cObj->currBufferLen > NULL)
         {
            retCode = PAL_osSemTake(i2cObj->completionSem, timeout);    走到这个函数里面就出不来了。
            if (retCode != PAL_SOK)
            {
               ...............
            }
}

/* To take a semaphore */
/*This function takes a semaphore token if available. If a semaphore is unavailable, it blocks currently running thread in wait (for specified duration) for a free semaphore*/
PAL_Result PAL_osSemTake(PAL_OsSemHandle hSem, Int32 mSecTimeout)
{
PAL_Result  semTakeResult = PAL_SOK;
Bool       semPendResult;

if( NULL != hSem )
{

      /* Only allow semTake, if it is not called from main */
      if (TSK_self() != (TSK_Handle)&KNL_dummy)                                                                               1
      {

#ifdef PAL_OSSEM_ENABLE_STATIC_MEM
         semPendResult = SEM_pend(&((PAL_OsSemObj *) hSem)->biosSemObj, mSecTimeout);       2
#else
         semPendResult = SEM_pend(hSem, mSecTimeout);
#endif
         if ( semPendResult == FALSE )
         {
            semTakeResult = PSP_E_RESOURCES;
         }
         else
         {
            semTakeResult = PAL_SOK;
         }
      }

}
else
{
      semTakeResult = PSP_E_INVAL_PARAM;
}

return semTakeResult;
}

上面是pal_osSem.c库函数，我的代码在走到return semTakeResult之后，又重新回到1处，接着往下执行到return semTakeResult，然后又回到1，大约反复两次次后，程序走到2后该函数内外的断点都端不住了，程序就飞了，请问什么原因啊？