在SEED官网买的SEED_DEC2812 v2.1版本开发板，其GPIOA和GPIOB 的数据传输方向在板子上被设置的是只能输出，请问这是硬件设计上的疏忽还是怎么回事，希望有大神帮忙解答一下，帮一下小弟，先谢过了。
附上其GPIO的硬件原理图如下：
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