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多通道的adc在切换通道的时候需要注意些什么

 我现在切换通道的时候,数据更新出现了点问题,有时候明明切换到通道2了,但是读的数据却是通道1的,但是有时候又是正常的!

用的adc芯片是iic通讯接口的,18位的adc,我现在采样速率是15SPS。