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CC3200的PHY速率是什么意思?如何设置?

Other Parts Discussed in Thread: CC3200

最近遇到一个需求,要求双向TCP通信,每40ms发送一个数据包,同时每30ms接收一个数据包,我用的两个socket,但是还是没法解决双向通信的延迟问题,所以查看了协议,发现cc3200可以设置PHY速率,

sl_SetSockOpt(iSockID1, SL_SOL_PHY_OPT, SL_SO_PHY_RATE, &rate, sizeof(rate));

然而,不管rate的值取多少,都会返回一个错误Error:non-readable!,求解释,另外告诉我怎么正确配置PHY速率