MSP432的中断问题

开发环境用的CCS6.1，复制了TI给的fpu的例程，里边用到了一个P1.1口按键的中断，在例程里直接运行时没有问题的，但是复制到我自己建的工程里，只要一按触发中断的按键程序就自动跳到一个死循环里，求助。。。。

/* This is the code that gets called when the processor receives an unexpected  */
/* interrupt.  This simply enters an infinite loop, preserving the system state */
/* for examination by a debugger.                                               */
static void defaultISR(void)
{
    /* Fault trap exempt from ULP advisor */
    #pragma diag_push
    #pragma CHECK_ULP("-2.1")

    /* Enter an infinite loop. */
    while(1)
    {
    }

    #pragma diag_pop
}