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TM4C1230d5pm中can中断刚开始能进行,但过了一段时间就无法进入can中断

在此程序中我在启动文件中声明了CANIntHandler后,can中断终于可以进行,但奇怪的是在发送中断正常进行了一段时间后,突然就无法进入CANIntHandler,请问一下这是怎么回事?