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在用C6670的例程的时候,发送的包数跟接收的包数为什么不一样?



AxC Channel 0 transfer 27720 packets, receive 27299 packets
用的是FDD200个帧进行测试,开始的两个帧用来同步,在第二个帧结束前开始发送(相当于发送了198个帧),以符号为单位组包,那么198*20*7=27720.但是为什么接受的时候是27299个包?