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28335AD转换结果显示的总是80A0



28335的AD转换结果老是显示80A0,无论外电压如何变化,始终显示80A0,我是拿TI官方程序做的实验,用的程序是adc_soc,其他的官方程序我也用了,但结果一样,请问这是为什么?