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我想通过 STM32F103C8T6 的 ADC 使用电阻分压器测量电池电压。系统启动时,STM32 的值为 6.35V,但当电池电压达到 6.45V 时,STM32 的值不变。我不知道那件事。请帮我。太感谢了。