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cc2530 ADC数据采样处理问题(急急!!)

Other Parts Discussed in Thread: CC2530

请问,在adc采样后提取数据后,看了协议栈相关的处理是:

case HAL_ADC_RESOLUTION_8:
reading >>= 8;
break;
case HAL_ADC_RESOLUTION_10:
reading >>= 6;
break;
case HAL_ADC_RESOLUTION_12:
reading >>= 4;
break;
case HAL_ADC_RESOLUTION_14:
default:
reading >>= 2;
break;

为什么要向右几位呢,不是只有低两位无效而已吗?还望TI大神回答,谢谢!