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ADS1256采样顺延一个通道问题

Other Parts Discussed in Thread: ADS1256

按照TI给的官方例程,开启单通道采样无问题。当开启多通道采样时,即调用函数将ADC值读到BUF中,会出现BUF0读到AN1的值,BUF1读到AN2的值,以此类推。最后BUF7读到AN0的值,例程基本没有改动,只是更改I/O端口。请问这是ADC本身出现的问题吗