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调试5515的GPAIN0 ADC管脚，参考SAR ADC文档设置读取，为什么读取值为实际值的4分之一呢？直接使用通道1是不是就可以直接采集不大于3.6V的电压？
请问使用的是channel几？如果输入信号的电压比VDDA_ANA大的话，需要用channel1来采集。
