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button_init(GPIO_PD5);这样单独使用的时候，按下按键时，可以正常打印按下的log。 但是，button_init(GPIO_PC7|GPIO_PD4|GPIO_PD5);这样，多个脚同时初始化后，就不能正常打印log了。如何初始化多个脚呢？