使用rfListenBeforeTalk例程，在调用 RF_runCmd(rfHandle, (RF_Op*)&RF_cmdNop, RF_PriorityNormal,&callback, 0);会执行发送。可是我的模块存在外部PA和LNA，在执行LNA检测的时候，应该通过IO把LNA打开，PA关闭，然后再发送的时候需要关闭LNA，打开PA再延迟几个毫秒，执行发送，请问应该怎么实现这个功能？
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