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关于CC2530的CCA功能疑问



for (;;)
{

ISRXON();

while(!(RSSISTAT & BV(0)));

ISSAMPLECCA();

if(!(FSMSTAT1 & SAMPLED_CCA))
{
//忙
  NOP();
}
else
{
//空闲
NOP();
}
}

我想问一下,在死循环检测信道的状态,  在同一信道上,我用一个端点发送载波,进入忙状态,关闭载波进入空闲状态,这是正常的

但是用一个端点发送发送数据,此时却检测不到信道忙?理论上信道有端点在发送数据,应该检测到忙才对吧?

请问下是什么原因?