请教CC2541的FCS问题

我使用的是CC2541，用USB dongle抓包如下：其中FCS是error：

请问这个FCS我在Central工程里的哪个地方能找到这个变量？

该在哪个文件，哪个结构体里？这个属于哪个层的东西。谢谢！

Keep in mind that when you see an "FCS error" on the packet sniffer, it could be that the BLE communication between the two devices is actually good, and the sniffer just misread bits when sniffing.

In general these can occur if you have a noisy environment or if there is something physically degrading the signal on the board. You can use software such as SmartRF Studio to verify the RF performance of your board.

Thanks for you reply my questions!

My team focus on how to acquire   result of FCS  in TI BLE procject ?

我的英文不好，非常感谢您的回复，您的大意是不是说这个FCS并不代表实际通信的丢失。 

但是现在我们关注的是在TI的协议栈例程里如何找到这个变量在哪？还是说需要自己去计算。

追问下：

1.这个FCS是不是自己算出来的CRC去与广播数据里传来的去比较得到的？

2.如果是那请问是哪些数据算出来的，算法是什么？如果不是那该怎么得到？

如下图：

CRC是根据AdvData里的数据，按字节异或得到的吗？然后去和CRC作比较！