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CC2540蓝牙传输功耗

Other Parts Discussed in Thread: CC2540

CC2540有-23dbm,-6dbm,0dbm,4dbm4个蓝牙输出功耗,为什么更改这几个值发现传输距离没有太大的变化,请问CC2540有现成的API(关于更改蓝牙传输功耗)可以调用吗?