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LM4F120的ADC采样



用LM4F120采样拾音器的输出信号,将采样的数据读到value[0]中,用KEIL仿真看value[0]的值,在0和4095波动,此时用万用表读取拾音器输出信号,只是0.30V而已,请问是什么设置不对呢。