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我把gpiob0~b7配置成输入引脚，但是从引脚读回来的值始终为1，即使我把引脚直接接地它也是高电平，请问这是什么情况啊？配置成输出引脚时能正常工作，检测过了。
从硬件上说 GPIO0-7引脚没有其他外设吗 或者有没有类似嵌位电路这样的设计
确保配置为GPIO并且为输入的话 一般不会出现这个问题
