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设置为内部参考电压，采集2伏以下的电压都没问题，现在改用外部参考电压芯片，用的是REF3140, 4.096V，mux1应该怎么设才对，我试了mux1的各种组合，结果都不准确，是不是还需要配置别的寄存器?
解决了，是精度没改
改什么精度，在哪里修改？
