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使用Zstack 中的AD采集API读取AD值,结果有些问题

Other Parts Discussed in Thread: CC2530

  HalAdcSetReference (HAL_ADC_REF_125V );//设置内部参考电压源1.15V
  Vdd_ADC = HalAdcRead(HAL_ADC_CHN_VDD3,HAL_ADC_RESOLUTION_14);
  Value =(Vdd_ADC*1.15/2047)*3;

然后用串口显示,发现读取到的是0.51

请问这是咋回事?