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GPIO中断问题



专家好,我现在想测试一下GPIO中断,就想在GPIO的8号管脚输入一个1Hz的方波,上升沿触发中断,中断服务子程序中就执行加1的功能,但是现在我不知道这个由信号源产生的1Hz的方波信号应该怎么样输入到GPIO的8号管脚,还请专家指导,不胜感激!