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msp430 i2041 sd24采样精度不够?

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param.oversampleRatio = SD24_OVERSAMPLE_256;   //过采样 32 64 128 256

Ch0results = (int32_t)SD24_getHighWordResults(SD24_BASE, SD24_CONVERTER_0);

给个恒定电压,采样出来的精度在10毫伏左右,请教下,如何完善精度问题


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