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MSP432P401R的 RTC校准功能没有效果

按照数据手册,Real-time clock calibration for crystal offset error,msp432P401R 可以通过修改寄存器

RTCOCALS与RTCOCALx,修改方式通过函数RTC_C_setCalibrationData(0x8000,239)修改;一台添加上面的函数,一台不添加,24小时后2台没有差别。请问如何使 RTC校准功能函数有效