请问用Overlapped Processing能在1ms发送20个字节吗？

1毫秒应该不能的，5毫秒估计能做到吧。
                                                                         
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请您参考 TI WIKI页面内http://processors.wiki.ti.com/index.php/OverlappedProcessing 给出的代码
The simpleBLEPeripheral project has also been modified so that an event to send a dummy 20-byte notification is set every 1 ms.  This won't actually get called every 1 ms as the application task has the lowest priority and other tasks will have to process but it should happen often enough that we can exercise the overlapped processing.