配置GPIO口的例子，参见以下链接
【经验分享】飞思卡尔IMX6处理器的GPIO配置方式
https://bbs.21ic.com/forum.php?mo ... &fromuid=892276
你去看一下RM手册中的IOMUX Controller (IOMUXC)部分，弄清楚寄存器的定义。
附上部分说明：
• SW_MUX_CTL: Selects the primary or alternate function of a pin, and enables
loopback mode when applicable.
• SW_SELECT_INPUT: Controls pin input path. This register is only required when
multiple pads drive the same internal port.
• SW_PAD_CTL: Controls pad slew rate, driver strength, pull-up/down resistance, and
so on.
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