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LAUNCHXL-F280039C: GPIO28 电平无法反转问题

Part Number: LAUNCHXL-F280039C

你好,我在使用LAUNCHXL-F280039C开发板运行gpio_ex3_interrupt 例程时,默认GPIO28作为输入中断脚,但是该引脚无反应,使用其他引脚给该引脚翻转信号仍然无反应,单独对GPIO28进行配置,使其反转,检测不到电平翻转信号,将该例程中的28引脚改为GPIO26引脚,可以正常触发运行,请问是该引脚坏了还是这个开发板上有什么特殊配置?