使用2812读取AD芯片转换出的数据，发现2812数据线引脚在程序运行/停止时都是高电平（悬空状态，直接示波器探头观看），这也导致读取到的数据数组全为65535，请问如何配置2812数据线作为输入端，而非一个“电源”输出
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