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没有使用到的GPIO悬空就可以了。内部上拉电阻会让引脚处于输入,在高电平的状态。
模拟接口的话得去查看相应的数据手册中的提示。
附件中有一个TI C2000硬件设计的文档,中文版的,里面介绍的很详细。相信会对您有用的。