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Example_2802xAdcSoc例子，，通过连接开发板下载程序，对应的AD输入口空着。。。。然后查看Voltage，Voltage2的值，，为什么显示值为2000左右的值。。。我记得让AD输入口采集过1.75V以及2.5V的直流电压。
AD口悬空采集到的应该是一个中间值
