循环判断如下： 请问HalfReady和fstop两个参数该如果设计？第二个循环在什么条件下跳出？ do { do { AI_AsyncDblBufferHalfReady (cardID, &HalfReady, &fstop); } while (!HalfReady????); //half buffer data is ready for read AI_AsyncDblBufferTransfer (cardID, NULL); } while (????);