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测试ADC采样部分时。母线电压采样结果与实际不符。电路上有1.65V电压偏置，实际测量电压为1.64V左右，但是采样得到的数字量很小
同贴http://www.deyisupport.com/question_answer/dsp_arm/f/22/t/129104.aspx
