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GPIO口不使用时如何配置，悬空，上拉，下拉，接地？
功能配置为IO 或外设，方向为输入还是输出
一般，设为输入，加电阻进行弱上拉或者弱下拉。
这类硬件设计方面问题都可以参考下面的文档，里面有详述：
www.ti.com/.../spraas1b
你好：
此文档链接失效，能否重发一下，感谢！
