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EXTI_INT_TYPE 配置寄存器写完之后，不管写的是什么，马上读出来就全变成 0 了！ 这导致在使用上升沿、下降沿双向中断时，必须把当前的配置自己保存到变量中，然后在中断中再设置为反向！ 怎么不搞个能双向中断的配置呢？！用起来真麻烦！
