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28335 adc 测量的时候一般是4LSB的误差。楼主的误差偏大,估计是硬件原因,这不是软件可以解决的,楼主用例程包中的adc_soc例程试试,保证被测信号稳定,调整采样窗大小。
此外下面是这篇文档中的关于ADC硬件设计的说明也可以参考: