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CC2540 P06/P07 ADC采集问题

Other Parts Discussed in Thread: CC2540

问题现象:使用CC2540的P06/P07进行ADC采集(原理图如下)时,按下任何按健,采集的ADC值为09、或者08。使用同一程序,将P05接至下述的P06处,ADC采集值正常。

代码未对USB Control部分进行操作,使用的为芯片默认值。

请问:使用P06/07需要怎么设置,才能正常使用其ADC功能?